A multi-stage cooperative control method for indoor vegetable planting

Abstract

The present application relates to the technical field of vegetable planting, and particularly relates to a multi-stage synergistic control indoor vegetable planting method, comprising steps S1 to S8, wherein, in step S1, the selected basic seed raising sponge and basic coated seeds are respectively subjected to extrusion pretreatment and screening pretreatment to respectively output target seed raising sponge and complete coated seeds; in step S2, a to-be-sprout-inducing seed raising tray is formed; in step S3, the to-be-sprout-inducing seed raising tray is subjected to sprout induction to form a seed raising sprouting tray with qualified germination rate; in step S4, one-stage seed raising operation is performed on the seedling in the seed raising sprouting tray to form a one-stage seed raising tray; and in steps S5 to S8, the main processes are two-stage seed raising rooting operation, formation of transplanted seedlings, planting growth operation, temperature stress and nutrient stress to form finished product vegetables. The present application realizes the improvement of the control accuracy of vegetable planting growth.

Description

A Multi-Stage Collaborative Control Method for Indoor Vegetable Cultivation Technical Field

[0001] This invention relates to the field of vegetable cultivation technology, and in particular to a multi-stage collaborative control method for indoor vegetable cultivation. Background Technology

[0002] In the field of indoor vegetable cultivation, although indoor cultivation technology represents the highest level, a prominent and counterintuitive phenomenon is that the marketable yield (the proportion of first-grade lettuce for sale) produced in indoor plant factories is often significantly lower than that of traditionally grown lettuce. The root cause is not that the technology itself cannot achieve precise control, but rather stems from two deep-seated cognitive misconceptions and technological deficiencies: 1. The cognitive paradox of a "perfect environment" and growth disharmony. In indoor plant factories, in pursuit of extreme growth rates, environmental factors such as light, water, fertilizer, and carbon dioxide are often continuously maintained at the saturation or even critical stress points for crop growth. This "forced growth" cultivation model leads to excessively rapid vegetative growth in lettuce, resulting in an imbalance between the accumulation of photosynthetic products and morphogenesis and material transformation. Specifically, this manifests as: excessive vegetative growth and poor morphology: thin leaves, long and thin petioles, loose or inability to form heads, fragile plant mechanical tissues, easy lodging or damage, and a severe decline in appearance. 1. Uneven accumulation of matter: Excessive growth rate leads to insufficient dry matter accumulation, excessive moisture content, poor taste and flavor (such as sweetness and crispness), shortened shelf life, and potentially lower-than-expected nutritional value (such as vitamin and mineral content). 2. A mismatch between production processes and high growth rates: Current indoor lettuce production processes are mostly improvements on traditional planting techniques or early low-growth-rate indoor planting experiences, severely lacking a refined, full-cycle process system specifically designed for the core characteristic of "high growth rate." This lack of support manifests in: Extensive environmental control strategies: A lack of strategies for "rhythmic" regulation based on the dynamic needs of lettuce at different growth stages (seedling stage, rapid growth stage, maturity stage), making it impossible to find the optimal balance between promoting growth and ensuring quality. Lagging nutrient and water management: Existing nutrient solution formulas and management schemes fail to fully consider the instantaneous demand and absorption efficiency of specific nutrients (such as calcium and silicon to enhance stress resistance) in lettuce under high-speed growth, leading to a high incidence of physiological diseases (such as calcium deficiency-induced edge burn).

[0003] Chinese Patent Publication No. CN105766575A discloses a method for the industrialized cultivation of hydroponically grown lettuce, with the following specific steps: 1) Seed treatment; 2) Seedling raising; 3) Transplanting; 4) Planting management, including light and temperature management, nutrient solution pH and conductivity management, and timely harvesting. The planting method of this invention, by using pelleted seeds, not only reduces the incidence of pests and diseases during lettuce growth, but also effectively reduces seed usage and shortens the seedling cycle through precision sowing. The seedling substrate of this invention not only meets the low-light conditions required for lettuce seed germination, but also improves the germination rate. Furthermore, by adjusting the content of various elements in the nutrient solution and the pH and EC values ​​of the nutrient solution, the most suitable nutritional environment for lettuce growth is provided, preventing root rot. Therefore, the aforementioned liquid culture method for industrialized lettuce cultivation suffers from problems such as excessively rapid and unbalanced vegetative growth due to maintaining a high-light, high-water, high-fertilizer, and high-carbon dioxide environment, and a lack of stage-specific regulation based on the dynamic needs of lettuce at different growth stages, failing to meet the specific elemental requirements under high growth conditions. Summary of the Invention

[0004] To address this, the present invention provides a multi-stage collaborative control method for indoor vegetable cultivation, which overcomes the problems in the prior art where maintaining a growth environment with high light, high water and fertilizer, and high carbon dioxide leads to excessively rapid and unbalanced nutrient growth in lettuce, and the lack of staged regulation based on the dynamic needs of lettuce at different growth stages results in the failure to meet the demand for specific elements under high growth conditions.

[0005] To achieve the above objectives, the present invention provides a multi-stage collaborative control method for indoor vegetable cultivation, comprising:

[0006] Step S1: The selected basic seedling sponge and basic coated seeds are subjected to extrusion pretreatment and screening pretreatment respectively, so as to output the target seedling sponge and complete coated seeds respectively.

[0007] The density of the basic seedling sponge is 25D; the extrusion pretreatment involves repeatedly extruding and washing the basic seedling sponge with purified water with a pH of 6 and an EC value of less than 0.1 mS / cm.

[0008] Step S2: Pour nutrient solution into the seedling tray, soak and squeeze the target seedling sponge placed in the seedling tray, put the whole coated seeds into the holes of the seedling tray, and spray the target seedling sponge with nutrient solution and purified water in sequence to form a seedling tray to be germinated.

[0009] Step S3: Germinate the seedling trays to be germinated to form seedling germination trays with qualified germination rate;

[0010] Step S4: Perform a first-stage seedling raising operation on the germinated seedlings in the seedling germination tray to form a first-stage seedling tray.

[0011] Step S5: Place a stainless steel rooting net and nutrient solution under the target seedling sponge in the first-stage seedling tray to carry out the second-stage seedling rooting operation, so as to form a sponge rooting tray.

[0012] Among them, the preset day-night temperature difference in the second-stage seedling rooting operation is determined based on the change in the average leaf area of ​​the germinating seedlings during the night monitoring period.

[0013] Step S6: Divide the sponge rooting tray to obtain sponge rooting substrate blocks, and transplant the sponge rooting substrate blocks into the planting holes of the primary transplanting tray to form transplanted seedlings;

[0014] Step S7: Perform planting and growth operations on the transplanted seedlings and control transplanted seedlings respectively to form vegetable seedlings for planting and control vegetable seedlings for planting.

[0015] Step S8: During the harvest preparation period, the planted vegetable seedlings are subjected to temperature stress and nutrient stress according to the target diurnal temperature range and the target nutrient solution EC value, respectively, in order to form finished vegetables;

[0016] The target diurnal temperature difference is determined based on the difference between the average growth evaluation parameters of the planted vegetable seedlings and the average growth evaluation parameters of the control planted vegetable seedlings during the transplanting and growth operation.

[0017] Further, in step S2, the step of sequentially spraying nutrient solution and purified water onto the target seedling sponge to form a seedling tray for germination includes:

[0018] Spray 200 ml of nutrient solution onto the surface of the target seedling sponge using a pressure sprayer;

[0019] Spray 200 ml of purified water onto the surface of the target seedling sponge using a pressure sprayer to form a seedling tray for germination.

[0020] The nutrient solution has an EC value of 1.5 mS / cm and a pH value of 6; the purified water has a pH value of 6 and an EC value of less than 0.1 mS / cm.

[0021] Furthermore, in step S3, germinating the seedling trays involves stacking multiple layers of the seedling trays and placing them in a dark or sealed germination box for 24 hours, while controlling the cultivation environment according to the environmental control conditions of the germination box.

[0022] The environmental control conditions include maintaining a constant temperature of 23°C, humidity of 85%-95%, no light, and a carbon dioxide concentration of 800ppm in the germination chamber for 24 hours; a germination rate greater than 95% is defined as a qualified germination rate.

[0023] Further, step S4 includes:

[0024] Step S41: Place the seedling germination tray onto the seedling rack;

[0025] Step S42: Evenly spray 50 ml of nutrient solution with an EC value of 1.5 and a pH of 6 onto the target seedling sponge in the seedling germination tray.

[0026] Step S43: Pull down the side light-blocking curtain on the seedling rack;

[0027] Step S44: Turn on the LED plant growth light;

[0028] Step S45: Turn on the VAF vertical ventilation device located at the top of the planting layer;

[0029] Step S46: Control the cultivation environment according to the daily environmental control parameters for the first stage of seedling cultivation to form the first stage seedling tray;

[0030] The daily environmental control parameters for the first stage of seedling cultivation include:

[0031] During the period from 8:00 to 8:30, the temperature was 23℃, the humidity was 75%, the LED lighting was on, the photosynthetically active radiation starting value was 70μmol / ㎡ / s, and it increased uniformly to 210μmol / ㎡ / s within 30 minutes, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.3m / s.

[0032] During the period from 8:30 to 23:30, the temperature was 23℃, the humidity was 75%, the photosynthetically active radiation was 210μmol / ㎡ / s, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.3m / s.

[0033] During the period from 23:30 to 00:00, the temperature is 23℃, the humidity is 75%, the photosynthetically active radiation value decreases from 210μmol / ㎡ / s within 1 hour until it is completely shut off, the carbon dioxide concentration is 800ppm, and the vertical ventilation speed is 0.3m / s.

[0034] During the period from 00:00 to 00:30, the temperature is 23℃, the humidity is 75%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.3m / s.

[0035] During the period from 00:30 to 01:00, the temperature will drop from 23℃ to 20℃ within 30 minutes, and the humidity will rise from 75% to 95% within 30 minutes; the carbon dioxide supply will be stopped, and the vertical ventilation speed will be reduced to 0.2m / s within 30 minutes.

[0036] During the period from 01:00 to 07:00, the temperature is 20℃, the humidity is 95%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.2m / s.

[0037] Between 07:00 and 07:30, the temperature rose from 20°C to 23°C within 30 minutes; the humidity dropped from 95% to 75% within 30 minutes; carbon dioxide supply was stopped; and the vertical ventilation speed increased to 0.3 m / s within 30 minutes.

[0038] Between 07:30 and 08:00, the temperature is 23℃ and the humidity is 75%; carbon dioxide supply is stopped, and the vertical ventilation speed is 0.3m / s.

[0039] If the leaf coverage area in the seedling germination tray is greater than or equal to the preset area ratio, the vertical ventilation speed of the seedling germination tray will be increased.

[0040] Further, in step S7, the process of forming the control vegetable seedlings includes: selecting a control single-transplanting tray, placing a sponge rooting substrate block into the control single-transplanting tray, performing control planting and growth operations, and continuing to perform planting and growth operations on the control transplanted seedlings according to the preset day-night temperature difference and preset nutrient solution EC value during the control monitoring period before the end of the planting and growth cycle, so as to form control vegetable seedlings;

[0041] If the difference between the average growth evaluation parameters of the control vegetable seedlings and the average growth evaluation parameters of the vegetable seedlings planted during the transplanting and growth operation is greater than the preset difference, then the diurnal temperature difference during the harvest preparation period will be reduced to the target diurnal temperature difference; the control transplanted seedlings and the transplanted seedlings both come from the same sponge rooting tray.

[0042] Furthermore, the average growth evaluation parameter of the vegetable seedlings planted in the transplanting and growth operation is the ratio of the sum of the growth evaluation parameters of all the vegetable seedlings planted in the transplanting and growth operation to the total number of vegetable seedlings planted.

[0043] Among them, the growth evaluation parameter Q of the i-th vegetable seedling is... i The calculation formula is:

[0044]

[0045] Where A is the ratio of the crown width of the i-th vegetable seedling to the maximum normal crown width, α is the crown width ratio weighting coefficient, B is the ratio of the number of leaves of the i-th vegetable seedling to the maximum normal number of leaves of a single vegetable seedling, β is the leaf number ratio weighting coefficient, C is the ratio of the total leaf area of ​​the i-th vegetable seedling to the total area of ​​the maximum normal leaves, γ is the leaf area ratio weighting coefficient, D is the ratio of the growth height of the i-th vegetable seedling to the maximum normal growth height, and δ is the growth height ratio weighting coefficient; α+β+γ+δ=1.

[0046] Further, in step S5, the size of the stainless steel rooting net is the same as the size of the basic seedling sponge; the volume of the nutrient solution is 1000 ml, the EC value is 1.5 mS / cm, the pH value is 6.0, the liquid level of the nutrient solution does not exceed the height of the stainless steel net and does not contact the target seedling sponge; the target seedling sponge is above the stainless steel rooting net.

[0047] The daily environmental control parameters for the two-stage seedling rooting operation include:

[0048] Between 8:00 and 8:30, the temperature was 23°C, the humidity was 75%, the LED lighting was on, the photosynthetically active radiation starting value was 70 μmol / m² / s, and it increased uniformly to 210 μmol / m² / s within 30 minutes; the carbon dioxide concentration was 800 ppm, and the vertical ventilation speed was 0.4 m / s.

[0049] Between 8:30 and 23:30, the temperature was 23℃, the humidity was 75%, the photosynthetically active radiation was 210μmol / ㎡ / s, and the carbon dioxide concentration was 800ppm; the vertical ventilation velocity was 0.4m / s.

[0050] During the period from 23:30 to 00:00, the temperature was 23℃, the humidity was 75%, the photosynthetically active radiation value decreased uniformly from 210μmol / ㎡ / s to 0 within half an hour, the carbon dioxide concentration was 800ppm, and the vertical ventilation wind speed was 0.4m / s.

[0051] During the period from 00:00 to 00:30, the temperature is 23℃, the humidity is 75%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.4m / s.

[0052] Between 00:30 and 01:00, the temperature dropped from 23°C to 20°C, the humidity rose steadily from 75% to 95% within half an hour, carbon dioxide supply was stopped, and the vertical ventilation speed was reduced steadily to 0.2 m / s.

[0053] During the period from 01:00 to 07:00, the temperature is 20℃, the humidity is 95%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.2m / s.

[0054] Between 07:00 and 07:30, the temperature rises steadily from 20°C to 23°C, the humidity drops steadily from 95% to 75%, carbon dioxide supply is stopped, and the vertical ventilation speed increases steadily to 0.4 m / s.

[0055] During the period from 07:30 to 08:00, the temperature is 23℃, the humidity is 75%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.4m / s.

[0056] If the change in the average leaf area of ​​germinating seedlings during the nighttime monitoring period is less than or equal to a preset change, then the preset diurnal temperature difference is increased.

[0057] Further, step S6 includes:

[0058] Step S61: Disassemble the target seedling sponge in each 100-cell sponge rooting tray into 100 individual sponge rooting substrate blocks.

[0059] Step S62: Take a piece of sponge rooting substrate containing seedlings and soak the roots in a container of purified water with the seedlings facing upwards and the roots facing downwards.

[0060] Step S63: Insert the soaked sponge rooting substrate block into the planting hole of the primary transplanting tray containing nutrient solution so that the roots come into contact with the nutrient solution and form transplanted seedlings after the transplanting growth period.

[0061] The daily environmental control parameters during the transplanting process include:

[0062] During the period from 8:00 to 8:30, the temperature was 23℃, the humidity was 75%, the LED lighting was on, the photosynthetically active radiation starting value was 70μmol / ㎡ / s, and it increased uniformly to 210μmol / ㎡ / s within 30 minutes, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.5m / s.

[0063] During the period from 8:30 to 23:30, the temperature was 23℃, the humidity was 75%, the photosynthetically active radiation was 210μmol / ㎡ / s, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.5m / s.

[0064] During the period from 23:30 to 00:00, the temperature was 23℃, the humidity was 75%, the photosynthetically active radiation value decreased uniformly from 210μmol / ㎡ / s to the point of complete shutdown within half an hour, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.5m / s.

[0065] During the period from 00:00 to 00:30, the temperature is 23℃, the humidity is 75%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.5m / s.

[0066] During the period from 00:30 to 01:00, the temperature decreased from 23℃ to 20℃ at a constant rate, the humidity increased from 75% to 95% at a constant rate, the carbon dioxide supply was stopped, and the vertical ventilation speed was reduced to 0.3m / s.

[0067] During the period from 01:00 to 07:00, the temperature is 20℃, the humidity is 95%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.3m / s.

[0068] Between 07:00 and 07:30, the temperature rose steadily from 20°C to 23°C, and the humidity dropped steadily from 95% to 75%; carbon dioxide supply was stopped, and the vertical ventilation speed was increased steadily to 0.5 m / s.

[0069] Between 07:30 and 08:00, the temperature is 23℃, the humidity is 75%, carbon dioxide supply is stopped, and the vertical ventilation speed is 0.5m / s.

[0070] Further, step S7 includes:

[0071] Step S71: Remove several transplanted seedlings from the transplanting tray;

[0072] Step S72: Immerse the roots of several transplanted seedlings downwards in purified water;

[0073] Step S73: Place the soaked transplanted seedlings into the planting holes of the planting tray for transplanting and cultivation.

[0074] Step S74: Control the cultivation environment according to the daily environmental control parameters for planting;

[0075] The daily environmental control parameters for planting include:

[0076] During the period from 8:00 to 8:30, the temperature was 22℃, the humidity was 70%, the LED lighting was on, the photosynthetically active radiation starting value was 70μmol / ㎡ / s, and it increased uniformly to 250μmol / ㎡ / s within 30 minutes, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.8m / s.

[0077] During the period from 8:30 to 23:30, the temperature was 22℃, the humidity was 70%, the photosynthetically active radiation was 250μmol / ㎡ / s, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.8m / s.

[0078] During the period from 23:30 to 00:00, the temperature was 22℃, the humidity was 70%, the photosynthetically active radiation decreased uniformly from 250μmol / ㎡ / s until it was completely shut off, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.8m / s.

[0079] During the period from 00:00 to 00:30, the temperature is 22℃, the humidity is 70%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.8m / s.

[0080] During the period from 00:30 to 01:00, the temperature decreased from 22℃ to 20℃ at a constant rate, the humidity increased from 70% to 95%, the carbon dioxide supply was stopped, and the vertical ventilation speed decreased to 0.5m / s at a constant rate.

[0081] During the period from 01:00 to 07:00, the temperature is 20℃, the humidity is 95%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.5m / s.

[0082] Between 07:00 and 07:30, the temperature rises steadily from 20°C to 22°C; the humidity drops steadily from 95% to 70%; carbon dioxide supply is stopped; and the vertical ventilation speed is increased to 0.8 m / s.

[0083] Between 07:30 and 08:00, the temperature is 22℃, the humidity is 70%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.8m / s.

[0084] Furthermore, in step S8, the daily environmental control parameters during the harvest preparation period include:

[0085] During the period from 8:00 to 8:30, the temperature was 20℃, the humidity was 70%, the LED lighting was on, the photosynthetically active radiation starting value was 70μmol / ㎡ / s, which increased to 250μmol / ㎡ / s within 30 minutes, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.8m / s.

[0086] During the period from 8:30 to 23:30, the temperature was 20℃, the humidity was 70%, the photosynthetically active radiation was 250μmol / ㎡ / s, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.8m / s.

[0087] During the period from 23:30 to 00:00, the temperature is 20℃, the humidity is 70%, the photosynthetically active radiation value decreases from 250μmol / ㎡ / s until it is completely shut off, the carbon dioxide concentration is 800ppm, and the vertical ventilation speed is 0.8m / s.

[0088] During the period from 00:00 to 00:30, the temperature is 20℃, the humidity is 70%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.8m / s.

[0089] Between 00:30 and 01:00, the temperature drops from 20℃ to 16℃; the humidity rises from 70% to 95%; carbon dioxide supply is stopped; and the vertical ventilation speed is reduced to 0.5m / s.

[0090] During the period from 01:00 to 07:00, the temperature is 16℃, the humidity is 95%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.5m / s.

[0091] Between 07:00 and 07:30, the temperature rose from 16°C to 20°C; the humidity dropped from 95% to 70%; carbon dioxide supply was stopped; and the vertical ventilation speed was increased to 0.8 m / s.

[0092] Between 07:30 and 08:00, the temperature is 20℃, the humidity is 70%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.8m / s.

[0093] Compared with the prior art, the beneficial effects of the present invention are as follows: the method of the present invention selects a 25D density sponge substrate. Although 30D has a higher density than 25D and better water absorption, its pores are too compact, making it difficult for the weak roots to penetrate during the seedling stage. Moreover, the better water absorption leads to a weakened oxygen environment for the roots, and oxygen is a more important control indicator for root growth in an environment with sufficient nutrient solution. Although 20D has a lower density than 25D and greater porosity, resulting in a better water vapor environment, its low density leads to a small water retention capacity, which is insufficient to support the first stage of seedling cultivation in this process. That is, the time from soaking the seedling sponge in water to drying out is insufficient to support the total seedling cultivation time.

[0094] Furthermore, the method described in this invention involves repeatedly squeezing and washing the sponge with pure water at pH 6 and EC < 0.1 mS / cm during the material pretreatment process. This actively adjusts the pH of the sponge from the slightly alkaline level of approximately 8.0 to a slightly acidic environment (5.8-6.2) most suitable for seedling roots to absorb nutrients. The extremely low EC value ensures that there is no initial salt stress, providing a "pure starting point" for subsequent precise nutrient solution control and solving the problem of unsuitable initial environment.

[0095] Furthermore, this invention employs a photorhythmic simulation strategy of light, temperature, and humidity during the first-stage seedling stage, combined with side-mounted light-blocking curtains and top-mounted VAF vertical ventilation. This effectively suppresses excessive above-ground growth, promoting robust stems and compact leaves, resulting in healthy, standardized seedlings. The gradual decrease in temperature simulates nightfall in the natural environment, helping plants to orderly close their stomata and accumulate nutrients. The gradual reduction in wind speed avoids stress on plants caused by drastic environmental changes. The gradual change in light environment from sunrise to sunset greatly reduces the light stress experienced by plants when lights are turned on, allowing them to initiate photosynthesis more smoothly and thus reducing energy loss.

[0096] Furthermore, the method described in this invention precisely increases dry matter and sugar content by subjecting vegetable seedlings to temperature and nutrient stress during the harvest preparation period. Daytime temperatures are lowered to 20°C and nighttime temperatures are significantly reduced to 16°C, resulting in a larger diurnal temperature range. This encourages plants to reduce the consumption of photosynthetic products accumulated during the day through respiration at night and promotes sugar accumulation. To resist the "cold," plants actively convert starch into soluble sugars (such as glucose and fructose) to lower the cell freezing point—a natural stress-resistance mechanism that significantly improves sweetness. The increased dry matter ratio, coupled with a slower growth rate, allows photosynthetic products to be used more for structural construction such as cell wall thickening, rather than cell expansion, resulting in thicker, firmer leaves and a significantly extended shelf life. Nutrient stress synergistically drives quality improvement, increasing the EC value of the nutrient solution from 1.5 mS / cm to 1.7 mS / cm. The higher osmotic pressure makes it slightly difficult for the roots to absorb water, which in turn prompts the plant to maintain osmotic balance by accumulating intracellular solutes (including sugars and amino acids). This, in conjunction with temperature stress, further enhances the formation of sweetness and flavor. It also synergistically regulates root temperature, consolidates the stress effect, and promotes substance transport. Lowering the nutrient solution temperature from 21℃ to 16℃ synchronizes with the lower air temperature, preventing the roots from maintaining vigorous growth due to higher temperatures and consolidating the temperature stress effect on the aboveground parts. On the other hand, the moderately low temperature reduces root activity, which, together with the higher EC value, cleverly inhibits water absorption and is more conducive to the accumulation of dry matter.

[0097] Furthermore, the method of the present invention determines the target diurnal temperature range by setting the difference between the average growth evaluation parameters of the planted vegetable seedlings and the average growth evaluation parameters of the control planted vegetable seedlings during the transplanting and growth operation. Since the planted vegetable seedlings have adapted to the parameters of the photothermal rhythm simulation process during the transition from the seedling stage to the harvest preparation stage, there is an error caused by the seedlings growing according to the original photothermal rhythm simulation process rather than by the harvest growth caused by temperature stress during the temperature and nutrient stress process. Therefore, by appropriately reducing the diurnal temperature range during the harvest preparation stage, the impact of this error on the accuracy of temperature stress is reduced. The method also uses the average leaf area of ​​the germinating seedlings during the nighttime monitoring period in the second-stage seedling rooting operation as a reference. Reducing the preset diurnal temperature range in the second-stage seedling rooting process can mitigate the impact of root growth. If the roots penetrate the sponge and the temperature transition is too rapid, the interaction between the roots and the sponge will intensify. This results in more and more roots trapping water in certain areas of the sponge, weakening normal water loss and root oxygen uptake. Consequently, the leaf area of ​​the germinating seedlings will shrink or even wither. Furthermore, excessive sponge shrinkage due to rapid diurnal temperature changes exacerbates the trapping effect of roots on water within the sponge. Therefore, reducing the preset diurnal temperature range in the second-stage seedling rooting process slows down the temperature transition, thus slowing the sponge's shrinkage. This allows more time and space for normal water loss and movement within the sponge, improving the accuracy of root development.

[0098] Furthermore, the method of the present invention increases the vertical ventilation speed of the seedling germination tray by setting it according to the proportion of leaf coverage area in the seedling germination tray, thereby reducing the impact of temperature on the temperature transmission effect below the seedling germination tray caused by excessive leaf coverage area, increasing the transpiration rate of vegetables, and thus further improving the vegetable growth efficiency and the accumulation of vegetable nutrients. Attached Figure Description

[0099] Figure 1 is an overall flowchart of the indoor vegetable planting method with multi-stage collaborative control according to an embodiment of the present invention;

[0100] Figure 2 is a detailed flowchart of step S4 of the multi-stage collaborative control indoor vegetable planting method according to an embodiment of the present invention;

[0101] Figure 3 is a flowchart of step S6 of the multi-stage collaborative control indoor vegetable planting method according to an embodiment of the present invention.

[0102] Figure 4 is a flowchart of step S7 of the multi-stage collaborative control indoor vegetable planting method according to an embodiment of the present invention. Detailed Implementation

[0103] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0104] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0105] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0106] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0107] Please refer to Figures 1, 2, 3, and 4, which are respectively the overall flowchart, the detailed flowchart of step S4, the detailed flowchart of step S6, and the detailed flowchart of step S7 of the multi-stage collaborative control indoor vegetable cultivation method according to an embodiment of the present invention. The present invention provides a multi-stage collaborative control indoor vegetable cultivation method, comprising:

[0108] Step S1: The selected basic seedling sponge and basic coated seeds are subjected to extrusion pretreatment and screening pretreatment respectively, so as to output the target seedling sponge and complete coated seeds respectively.

[0109] The density of the basic seedling sponge is 25D; the extrusion pretreatment involves repeatedly extruding and washing the basic seedling sponge with purified water with a pH of 6 and an EC value of less than 0.1 mS / cm.

[0110] Step S2: Pour nutrient solution into the seedling tray, soak and squeeze the target seedling sponge placed in the seedling tray, put the whole coated seeds into the holes of the seedling tray, and spray the target seedling sponge with nutrient solution and purified water in sequence to form a seedling tray to be germinated.

[0111] Step S3: Germinate the seedling trays to be germinated to form seedling germination trays with qualified germination rate;

[0112] Step S4: Perform a first-stage seedling raising operation on the germinated seedlings in the seedling germination tray to form a first-stage seedling tray.

[0113] Step S5: Place a stainless steel rooting net and nutrient solution under the target seedling sponge in the first-stage seedling tray to carry out the second-stage seedling rooting operation, so as to form a sponge rooting tray.

[0114] Among them, the preset day-night temperature difference in the second-stage seedling rooting operation is determined based on the change in the average leaf area of ​​the germinating seedlings during the night monitoring period.

[0115] Step S6: Divide the sponge rooting tray to obtain sponge rooting substrate blocks, and transplant the sponge rooting substrate blocks into the planting holes of the primary transplanting tray to form transplanted seedlings;

[0116] Step S7: Perform planting and growth operations on the transplanted seedlings and control transplanted seedlings respectively to form vegetable seedlings for planting and control vegetable seedlings for planting.

[0117] Step S8: During the harvest preparation period, the planted vegetable seedlings are subjected to temperature stress and nutrient stress according to the target diurnal temperature range and the target nutrient solution EC value, respectively, in order to form finished vegetables;

[0118] The target diurnal temperature difference is determined based on the difference between the average growth evaluation parameters of the planted vegetable seedlings and the average growth evaluation parameters of the control planted vegetable seedlings during the transplanting and growth operation.

[0119] Specifically, a constant temperature and humidity machine is used to regulate the ambient temperature and humidity, a carbon dioxide generator is used to regulate the carbon dioxide concentration, and a vertical circulation fan is used to regulate the wind speed.

[0120] Specifically, the seedling tray has 100 cells.

[0121] Specifically, the nutrient solution is Hogland nutrient solution.

[0122] Specifically, the vegetable is lettuce.

[0123] Specifically, the primary transplanting tray is made of EPS polystyrene and measures 900mm*600mm. The primary transplanting tray has several planting holes evenly distributed on it. The planting holes are circles with a diameter of 27mm, which match the 25mm×25mm sponge rooting substrate blocks. Each primary transplanting tray has 7 columns × 11 rows of holes, for a total of 77 holes.

[0124] In practice, the method described in this invention selects a 25D density sponge substrate. While 30D has a higher density than 25D and better water absorption, its pores are too compact, making it difficult for the delicate roots to penetrate deeply during the seedling stage. Furthermore, the superior water absorption weakens the oxygen environment for the roots, which is a more important control indicator for root growth in an environment with sufficient nutrient solution. Although 20D has a lower density than 25D and greater porosity, resulting in a better water vapor environment, its low density leads to a small water retention capacity, making it difficult to support the first stage of seedling cultivation in this process. In other words, the time from soaking the seedling sponge in water to drying out is insufficient to support the total duration of one seedling cultivation session.

[0125] Specifically, the screening pretreatment involves using a sieve to screen and filter the basic coated seeds to remove coating residue.

[0126] In practice, the method described in this invention uses purified water with a pH of 6 and EC < 0.1 mS / cm for repeated squeezing and washing during the material pretreatment process. This actively adjusts the pH of the sponge from the slightly alkaline level of about 8.0 to a slightly acidic environment (5.8-6.2) that is most suitable for seedling roots to absorb nutrients. The extremely low EC value ensures that there is no initial salt stress, providing a "pure starting point" for subsequent precise nutrient solution control and solving the problem of unsuitable initial environment.

[0127] Specifically, in step S2, the process of sequentially spraying nutrient solution and purified water onto the target seedling sponge to form a seedling tray for germination includes:

[0128] Spray 200 ml of nutrient solution onto the surface of the target seedling sponge using a pressure sprayer;

[0129] Spray 200 ml of purified water onto the surface of the target seedling sponge using a pressure sprayer to form a seedling tray for germination.

[0130] The nutrient solution has an EC value of 1.5 mS / cm and a pH value of 6; the purified water has a pH value of 6 and an EC value of less than 0.1 mS / cm.

[0131] Specifically, in step S3, germinating the seedling trays involves stacking multiple layers of the seedling trays and placing them in a dark or enclosed germination box for 24 hours, while controlling the cultivation environment according to the environmental control conditions of the germination box.

[0132] The environmental control conditions include maintaining a constant temperature of 23°C, humidity of 85%-95%, no light, and a carbon dioxide concentration of 800ppm in the germination chamber for 24 hours; a germination rate greater than 95% is defined as a qualified germination rate.

[0133] Specifically, germination rate = number of germinated seeds / total number of seeds sown × 100%.

[0134] Specifically, the germination process takes place from day 1 to day 2.

[0135] Specifically, all operations prior to the germination process take place on the first day.

[0136] Specifically, step S4 includes:

[0137] Step S41: Place the seedling germination tray onto the seedling rack;

[0138] Step S42: Evenly spray 50 ml of nutrient solution with an EC value of 1.5 and a pH of 6 onto the target seedling sponge in the seedling germination tray.

[0139] Step S43: Pull down the side light-blocking curtain on the seedling rack;

[0140] Step S44: Turn on the LED plant growth light;

[0141] Step S45: Turn on the VAF vertical ventilation device located at the top of the planting layer;

[0142] Step S46: Control the cultivation environment according to the daily environmental control parameters for the first stage of seedling cultivation to form the first stage seedling tray;

[0143] The daily environmental control parameters for the first stage of seedling cultivation include:

[0144] During the period from 8:00 to 8:30, the temperature was 23℃, the humidity was 75%, the LED lighting was on, the photosynthetically active radiation starting value was 70μmol / ㎡ / s, and it increased uniformly to 210μmol / ㎡ / s within 30 minutes, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.3m / s.

[0145] During the period from 8:30 to 23:30, the temperature was 23℃, the humidity was 75%, the photosynthetically active radiation was 210μmol / ㎡ / s, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.3m / s.

[0146] During the period from 23:30 to 00:00, the temperature is 23℃, the humidity is 75%, the photosynthetically active radiation value decreases from 210μmol / ㎡ / s within 1 hour until it is completely shut off, the carbon dioxide concentration is 800ppm, and the vertical ventilation speed is 0.3m / s.

[0147] During the period from 00:00 to 00:30, the temperature is 23℃, the humidity is 75%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.3m / s.

[0148] During the period from 00:30 to 01:00, the temperature will drop from 23℃ to 20℃ within 30 minutes, and the humidity will rise from 75% to 95% within 30 minutes; the carbon dioxide supply will be stopped, and the vertical ventilation speed will be reduced to 0.2m / s within 30 minutes.

[0149] During the period from 01:00 to 07:00, the temperature is 20℃, the humidity is 95%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.2m / s.

[0150] Between 07:00 and 07:30, the temperature rose from 20°C to 23°C within 30 minutes; the humidity dropped from 95% to 75% within 30 minutes; carbon dioxide supply was stopped; and the vertical ventilation speed increased to 0.3 m / s within 30 minutes.

[0151] Between 07:30 and 08:00, the temperature is 23℃ and the humidity is 75%; carbon dioxide supply is stopped, and the vertical ventilation speed is 0.3m / s.

[0152] If the leaf coverage area in the seedling germination tray is greater than or equal to the preset area ratio, the vertical ventilation speed of the seedling germination tray will be increased.

[0153] In practice, the method of the present invention increases the vertical ventilation speed of the seedling germination tray according to the proportion of leaf coverage in the seedling germination tray, thereby reducing the impact of temperature on the temperature transmission effect below the seedling germination tray caused by excessive leaf coverage, and further improving the vegetable growth efficiency and the accumulation of vegetable nutrients.

[0154] In practice, this invention employs a photorhythmic simulation strategy of light, temperature, and humidity during the first-stage seedling stage, combined with side-mounted light-blocking curtains and top-mounted VAF vertical ventilation. This effectively suppresses excessive above-ground growth, promoting robust stems and compact leaves, resulting in healthy, standardized seedlings. The gradual decrease in temperature simulates nightfall in the natural environment, helping plants to orderly close their stomata and accumulate nutrients. The gradual reduction in wind speed avoids stress on plants caused by drastic environmental changes. The gradual change in light environment from sunrise to sunset greatly reduces the light stress experienced by plants when lights are turned on, allowing them to initiate photosynthesis more smoothly and thus reducing energy loss.

[0155] Specifically, the light, temperature, air, and humidity rhythm simulation strategy is used to control the daily environmental parameters for the first stage of seedling cultivation.

[0156] Specifically, the first stage of seedling cultivation lasts from day 2 to day 8.

[0157] Specifically, the percentage of leaf coverage area in the seedling germination tray during the monitoring period is the ratio of the total upper surface coverage area of ​​the leaves of all seedlings in the seedling germination tray to the total upper surface area of ​​the seedling germination tray during the monitoring period.

[0158] Specifically, the selectable range of the monitoring period is [30h, 50h], and the preferred embodiment of the monitoring period is 48h.

[0159] Specifically, an industrial camera is used to obtain the leaf coverage area and the total surface area of ​​the seedling germination tray. Those skilled in the art can also select other equipment according to the actual situation, as long as the leaf coverage area in the seedling development tray can be detected.

[0160] Optionally, the preset area ratio can be selected within the range of [0.88, 0.95], and the preferred embodiment of the preset area ratio is 0.9.

[0161] In practice, when the leaf coverage area ratio in the seedling development tray exceeds the preset area ratio by less than 0.01, the vertical ventilation speed of the seedling germination tray is adjusted to 1.15 times the current vertical ventilation speed of the seedling germination tray. When the leaf coverage area ratio in the seedling development tray exceeds the preset area ratio by more than 0.01, the vertical ventilation speed of the seedling development tray is increased by 0.01 m / s for every 0.001 exceeding the preset area ratio. In one embodiment, the leaf coverage area ratio in the seedling development tray is 0.93, and the current vertical ventilation speed of the seedling development tray is 0.3 m / s. Therefore, the increased vertical ventilation speed of the seedling development tray is 0.3 m / s × 1.15 + (0.93 - 0.9 - 0.01) / 0.001 × 0.01 m / s = 0.545 m / s.

[0162] In practice, the method of the present invention increases the vertical ventilation speed of the seedling germination tray according to the proportion of leaf coverage in the seedling germination tray, thereby reducing the impact of temperature on the temperature transmission effect below the seedling germination tray caused by excessive leaf coverage, and improving the transpiration rate of vegetables, thereby further improving the vegetable growth efficiency and the accumulation of vegetable nutrients.

[0163] Specifically, in step S7, the process of forming the control vegetable seedlings includes: selecting a control single-transplanting tray, placing a sponge rooting substrate block into the control single-transplanting tray, performing control planting and growth operations, and continuing to perform planting and growth operations on the control transplanted seedlings according to the preset day-night temperature difference and preset nutrient solution EC value during the control monitoring period before the end of the planting and growth cycle, so as to form control vegetable seedlings.

[0164] If the difference between the average growth evaluation parameters of the control vegetable seedlings and the average growth evaluation parameters of the vegetable seedlings planted during the transplanting and growth operation is greater than the preset difference, then the diurnal temperature difference during the harvest preparation period will be reduced to the target diurnal temperature difference; the control transplanted seedlings and the transplanted seedlings both come from the same sponge rooting tray.

[0165] Optionally, the control monitoring period can be selected from a range of [24h, 36h], and the preferred embodiment of the control monitoring period is 30h.

[0166] Specifically, the average growth evaluation parameter of the vegetable seedlings planted in the transplanting and growth operation is the ratio of the sum of the growth evaluation parameters of all the vegetable seedlings planted in the transplanting and growth operation to the total number of vegetable seedlings planted.

[0167] Among them, the growth evaluation parameter Q of the i-th vegetable seedling is... i The calculation formula is:

[0168]

[0169] Where A is the ratio of the crown width of the i-th vegetable seedling to the maximum normal crown width, α is the crown width ratio weighting coefficient, B is the ratio of the number of leaves of the i-th vegetable seedling to the maximum normal number of leaves of a single vegetable seedling, β is the leaf number ratio weighting coefficient, C is the ratio of the total leaf area of ​​the i-th vegetable seedling to the total area of ​​the maximum normal leaves, γ is the leaf area ratio weighting coefficient, D is the ratio of the growth height of the i-th vegetable seedling to the maximum normal growth height, and δ is the growth height ratio weighting coefficient; α+β+γ+δ=1.

[0170] Specifically, the preferred embodiment of α is 0.3, the preferred embodiment of β is 0.25, the preferred embodiment of γ is 0.3, and the preferred embodiment of δ is 0.15.

[0171] Specifically, the average growth evaluation parameter of the control vegetable seedlings is the ratio of the sum of the growth evaluation parameters of all control vegetable seedlings during the control monitoring period to the total number of control vegetable seedlings.

[0172] Among them, the growth evaluation parameter Q of the j-th control vegetable seedling is... J The calculation formula is:

[0173]

[0174] Where A' is the ratio of the crown width of the j-th control vegetable seedling to the maximum normal crown width, α' is the crown width ratio weighting coefficient, B' is the ratio of the number of leaves of the j-th control vegetable seedling to the maximum normal number of leaves per vegetable seedling, β' is the leaf number ratio weighting coefficient, C' is the ratio of the total leaf area of ​​the i-th vegetable seedling to the total area of ​​the maximum normal leaves, γ' is the leaf area ratio weighting coefficient, D' is the ratio of the growth height of the j-th control vegetable seedling to the maximum normal growth height, and δ' is the growth height ratio weighting coefficient; α'+β'+γ'+δ'=1.

[0175] Preferably, the preferred embodiment of α' is 0.3, the preferred embodiment of β' is 0.25, the preferred embodiment of γ' is 0.3, and the preferred embodiment of δ' is 0.15.

[0176] Preferably, the maximum normal crown width is 15cm, the maximum normal number of leaves per vegetable seedling is 20, the maximum total area of ​​normal leaves is 300cm², and the maximum normal growth height is 25cm.

[0177] Specifically, the selectable range of the preset difference is [0.05, 0.12], and the preferred embodiment of the preset difference is 0.08.

[0178] In implementation, when the difference exceeds the preset difference by less than 0.02, the target diurnal temperature range is 0.9 times the diurnal temperature range during the harvest preparation period. When the difference exceeds the preset difference by more than 0.02, the diurnal temperature range during the harvest preparation period is reduced by 0.01℃ for every 0.001 exceeding the preset difference. For example, in a possible embodiment, the difference is 0.092, and the diurnal temperature range during the harvest preparation period is 20℃-16℃=4℃. Then, the reduced diurnal temperature range during the harvest preparation period (target diurnal temperature range) is 4℃×0.9=3.6℃.

[0179] Specifically, an industrial camera is used to detect the crown width, number of leaves, leaf area, and growth height. Those skilled in the art will understand that using an industrial camera to detect the above parameters is a well-known detection method, so the specific detection process and detection and identification principle will not be described in detail here.

[0180] Specifically, in step S5, the size of the stainless steel rooting net is the same as the size of the basic seedling sponge; the volume of the nutrient solution is 1000 ml, the EC value is 1.5 mS / cm, the pH value is 6.0, the liquid level of the nutrient solution does not exceed the height of the stainless steel net and does not contact the target seedling sponge; the target seedling sponge is above the stainless steel rooting net.

[0181] The daily environmental control parameters for the two-stage seedling rooting operation include:

[0182] Between 8:00 and 8:30, the temperature was 23°C, the humidity was 75%, the LED lighting was on, the photosynthetically active radiation starting value was 70 μmol / m² / s, and it increased uniformly to 210 μmol / m² / s within 30 minutes; the carbon dioxide concentration was 800 ppm, and the vertical ventilation speed was 0.4 m / s.

[0183] Between 8:30 and 23:30, the temperature was 23℃, the humidity was 75%, the photosynthetically active radiation was 210μmol / ㎡ / s, and the carbon dioxide concentration was 800ppm; the vertical ventilation velocity was 0.4m / s.

[0184] During the period from 23:30 to 00:00, the temperature was 23℃, the humidity was 75%, the photosynthetically active radiation value decreased uniformly from 210μmol / ㎡ / s to 0 within half an hour, the carbon dioxide concentration was 800ppm, and the vertical ventilation wind speed was 0.4m / s.

[0185] During the period from 00:00 to 00:30, the temperature is 23℃, the humidity is 75%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.4m / s.

[0186] Between 00:30 and 01:00, the temperature dropped from 23°C to 20°C, the humidity rose steadily from 75% to 95% within half an hour, carbon dioxide supply was stopped, and the vertical ventilation speed was reduced steadily to 0.2 m / s.

[0187] During the period from 01:00 to 07:00, the temperature is 20℃, the humidity is 95%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.2m / s.

[0188] Between 07:00 and 07:30, the temperature rises steadily from 20°C to 23°C, the humidity drops steadily from 95% to 75%, carbon dioxide supply is stopped, and the vertical ventilation speed increases steadily to 0.4 m / s.

[0189] During the period from 07:30 to 08:00, the temperature is 23℃, the humidity is 75%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.4m / s.

[0190] If the change in the average leaf area of ​​germinating seedlings during the nighttime monitoring period is less than or equal to a preset change, then the preset diurnal temperature difference is reduced.

[0191] Specifically, the second stage of seedling cultivation and rooting process takes place from day 9 to day 13.

[0192] Specifically, the stainless steel rooting net is a mesh structure made of 304 stainless steel with a diameter of 1.5mm. Its dimensions are L250mm×W250mm×H15mm, and the mesh opening is square with a size of 15mm×15mm. There are several vertically arranged stainless steel wires at the bottom of the stainless steel rooting net to support the sponge seedling substrate.

[0193] Optionally, under an ambient temperature of 22°C, the preset range of the change amount is [3cm², 5cm²], and the preferred embodiment of the preset change amount is 4cm².

[0194] In practice, when the preset change exceeds the average leaf area change of the germinating seedlings by less than 1 cm², the preset diurnal temperature difference is adjusted to 0.9 times the preset diurnal temperature difference in the second-stage seedling rooting operation. When the preset change exceeds the average leaf area change of the germinating seedlings by more than 1 cm², the preset diurnal temperature difference is reduced by 0.01℃ for every 0.1 cm² increase. In one possible embodiment, the average leaf area change of the germinating seedlings is 5.2 cm², the night temperature in the second-stage seedling rooting operation is 20℃, and the daytime temperature is 23℃. Therefore, the preset diurnal temperature difference in the second-stage seedling rooting operation is 23℃-20℃=3℃. The increased preset diurnal temperature difference is 3℃×0.9-0.01℃×(5.2cm²-4cm²-1cm²) / 0.1cm²≈2.7℃ (calculated to one decimal place, following the rounding principle).

[0195] Specifically, the change in the average leaf area of ​​germinating seedlings during the nighttime monitoring period is the difference between the ratio of the total leaf area of ​​all germinating seedlings to the total number of germinating seedlings at the end of the nighttime monitoring period and the ratio of the total leaf area of ​​all germinating seedlings to the total number of germinating seedlings at the beginning of the nighttime monitoring period.

[0196] Specifically, the leaf area of ​​germinating seedlings is obtained by detecting the area using an industrial camera.

[0197] Specifically, the nighttime monitoring cycle lasts for 0.5 hours.

[0198] As will be understood by those skilled in the art, the working principle and process of industrial cameras are conventional technical means well known to them. Therefore, the specific process and working principle of using industrial cameras to detect the leaf area of ​​germinating seedlings will not be described in detail here.

[0199] Furthermore, the method of the present invention determines the target diurnal temperature range by setting the difference between the average growth evaluation parameters of the planted vegetable seedlings and the average growth evaluation parameters of the control planted vegetable seedlings during the transplanting and growth operation. Since the planted vegetable seedlings have adapted to the parameters of the photothermal rhythm simulation process during the transition from the seedling stage to the harvest preparation stage, there is an error caused by the seedlings growing according to the original photothermal rhythm simulation process rather than by the harvest growth caused by temperature stress during the temperature and nutrient stress process. Therefore, by appropriately reducing the diurnal temperature range during the harvest preparation stage, the impact of this error on the accuracy of temperature stress is reduced. The method also uses the average leaf area of ​​the germinating seedlings during the nighttime monitoring period in the second-stage seedling rooting operation as a reference. Reducing the preset diurnal temperature range in the second-stage seedling rooting process can mitigate the impact of root growth. If the roots penetrate the sponge and the temperature transition is too rapid, the interaction between the roots and the sponge will intensify. This results in more and more roots trapping water in certain areas of the sponge, weakening normal water loss and root oxygen uptake. Consequently, the leaf area of ​​the germinating seedlings will shrink or even wither. Furthermore, excessive sponge shrinkage due to rapid diurnal temperature changes exacerbates the trapping effect of roots on water within the sponge. Therefore, reducing the preset diurnal temperature range in the second-stage seedling rooting process slows down the temperature transition, thus slowing the sponge's shrinkage. This allows more time and space for normal water loss and movement within the sponge, improving the accuracy of root development.

[0200] Specifically, step S6 includes:

[0201] Step S61: Disassemble the target seedling sponge in each 100-cell sponge rooting tray into 100 individual sponge rooting substrate blocks.

[0202] Step S62: Take a piece of sponge rooting substrate containing seedlings and soak the roots in a container of purified water with the seedlings facing upwards and the roots facing downwards.

[0203] Step S63: Insert the soaked sponge rooting substrate block into the planting hole of the primary transplanting tray containing nutrient solution so that the roots come into contact with the nutrient solution and form transplanted seedlings after the transplanting growth period.

[0204] The daily environmental control parameters during the transplanting process include:

[0205] During the period from 8:00 to 8:30, the temperature was 23℃, the humidity was 75%, the LED lighting was on, the photosynthetically active radiation starting value was 70μmol / ㎡ / s, and it increased uniformly to 210μmol / ㎡ / s within 30 minutes, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.5m / s.

[0206] During the period from 8:30 to 23:30, the temperature was 23℃, the humidity was 75%, the photosynthetically active radiation was 210μmol / ㎡ / s, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.5m / s.

[0207] During the period from 23:30 to 00:00, the temperature was 23℃, the humidity was 75%, the photosynthetically active radiation value decreased uniformly from 210μmol / ㎡ / s to the point of complete shutdown within half an hour, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.5m / s.

[0208] During the period from 00:00 to 00:30, the temperature is 23℃, the humidity is 75%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.5m / s.

[0209] During the period from 00:30 to 01:00, the temperature decreased from 23℃ to 20℃ at a constant rate, the humidity increased from 75% to 95% at a constant rate, the carbon dioxide supply was stopped, and the vertical ventilation speed was reduced to 0.3m / s.

[0210] During the period from 01:00 to 07:00, the temperature is 20℃, the humidity is 95%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.3m / s.

[0211] Between 07:00 and 07:30, the temperature rose steadily from 20°C to 23°C, and the humidity dropped steadily from 95% to 75%; carbon dioxide supply was stopped, and the vertical ventilation speed was increased steadily to 0.5 m / s.

[0212] Between 07:30 and 08:00, the temperature is 23℃, the humidity is 75%, carbon dioxide supply is stopped, and the vertical ventilation speed is 0.5m / s.

[0213] Specifically, the daily water and fertilizer control parameters during the transplanting process include:

[0214] The EC value remained at 1.5 mS / cm throughout the day;

[0215] The pH level remained at 6.0 throughout the day;

[0216] The nutrient solution temperature is 21℃;

[0217] The dissolved oxygen content of the nutrient solution is 8.0 mg / L.

[0218] Specifically, the transplanting period is from day 14 to day 20.

[0219] Specifically, step S7 includes:

[0220] Step S71: Remove several transplanted seedlings from the transplanting tray;

[0221] Step S72: Immerse the roots of several transplanted seedlings downwards in purified water;

[0222] Step S73: Place the soaked transplanted seedlings into the planting holes of the planting tray for transplanting and cultivation.

[0223] Step S74: Control the cultivation environment according to the daily environmental control parameters for planting;

[0224] The daily environmental control parameters for planting include:

[0225] During the period from 8:00 to 8:30, the temperature was 22℃, the humidity was 70%, the LED lighting was on, the photosynthetically active radiation starting value was 70μmol / ㎡ / s, and it increased uniformly to 250μmol / ㎡ / s within 30 minutes, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.8m / s.

[0226] During the period from 8:30 to 23:30, the temperature was 22℃, the humidity was 70%, the photosynthetically active radiation was 250μmol / ㎡ / s, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.8m / s.

[0227] During the period from 23:30 to 00:00, the temperature was 22℃, the humidity was 70%, the photosynthetically active radiation decreased uniformly from 250μmol / ㎡ / s until it was completely shut off, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.8m / s.

[0228] During the period from 00:00 to 00:30, the temperature is 22℃, the humidity is 70%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.8m / s.

[0229] During the period from 00:30 to 01:00, the temperature decreased from 22℃ to 20℃ at a constant rate, the humidity increased from 70% to 95%, the carbon dioxide supply was stopped, and the vertical ventilation speed decreased to 0.5m / s at a constant rate.

[0230] During the period from 01:00 to 07:00, the temperature is 20℃, the humidity is 95%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.5m / s.

[0231] Between 07:00 and 07:30, the temperature rises steadily from 20°C to 22°C; the humidity drops steadily from 95% to 70%; carbon dioxide supply is stopped; and the vertical ventilation speed is increased to 0.8 m / s.

[0232] Between 07:30 and 08:00, the temperature is 22℃, the humidity is 70%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.8m / s.

[0233] Specifically, the daily water and fertilizer control parameters during the planting process are the same as those during the transplanting process.

[0234] Specifically, the transplanting process takes place from day 21 to day 38.

[0235] Specifically, in step S8, the daily environmental control parameters during the harvest preparation period include:

[0236] During the period from 8:00 to 8:30, the temperature was 20℃, the humidity was 70%, the LED lighting was on, the photosynthetically active radiation starting value was 70μmol / ㎡ / s, which increased to 250μmol / ㎡ / s within 30 minutes, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.8m / s.

[0237] During the period from 8:30 to 23:30, the temperature was 20℃, the humidity was 70%, the photosynthetically active radiation was 250μmol / ㎡ / s, the carbon dioxide concentration was 800ppm, and the vertical ventilation speed was 0.8m / s.

[0238] During the period from 23:30 to 00:00, the temperature is 20℃, the humidity is 70%, the photosynthetically active radiation value decreases from 250μmol / ㎡ / s until it is completely shut off, the carbon dioxide concentration is 800ppm, and the vertical ventilation speed is 0.8m / s.

[0239] During the period from 00:00 to 00:30, the temperature is 20℃, the humidity is 70%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.8m / s.

[0240] Between 00:30 and 01:00, the temperature drops from 20℃ to 16℃; the humidity rises from 70% to 95%; carbon dioxide supply is stopped; and the vertical ventilation speed is reduced to 0.5m / s.

[0241] During the period from 01:00 to 07:00, the temperature is 16℃, the humidity is 95%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.5m / s.

[0242] Between 07:00 and 07:30, the temperature rose from 16°C to 20°C; the humidity dropped from 95% to 70%; carbon dioxide supply was stopped; and the vertical ventilation speed was increased to 0.8 m / s.

[0243] Between 07:30 and 08:00, the temperature is 20℃, the humidity is 70%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.8m / s.

[0244] Specifically, the daily water and fertilizer control parameters during the harvest preparation period include:

[0245] The EC value remained at 1.7 mS / cm throughout the day;

[0246] The pH level remained at 6.0 throughout the day;

[0247] The nutrient solution temperature is 16℃;

[0248] The dissolved oxygen content of the nutrient solution is 8.0 mg / L.

[0249] Specifically, the harvest preparation period lasts from day 38 to day 42.

[0250] In practice, the method described in this invention precisely increases dry matter and sugar content by subjecting vegetable seedlings to temperature and nutrient stress during the harvest preparation period. Daytime temperatures are lowered to 20°C and nighttime temperatures are significantly reduced to 16°C, resulting in a larger diurnal temperature range. This encourages plants to reduce the consumption of photosynthetic products accumulated during the day through respiration at night and promotes sugar accumulation. To resist the "cold," plants actively convert starch into soluble sugars (such as glucose and fructose) to lower the cell freezing point—a natural stress-resistance mechanism that significantly improves sweetness. The increased dry matter ratio, coupled with a slower growth rate, allows photosynthetic products to be used more for cell wall thickening and structural construction rather than cell expansion, resulting in thicker, firmer leaves and a significantly extended shelf life. Nutrient stress synergistically drives quality improvement, increasing the EC value of the nutrient solution from 1.5 mS / cm to 1.7 mS / cm. The higher osmotic pressure makes it slightly difficult for the roots to absorb water, which in turn prompts the plant to maintain osmotic balance by accumulating intracellular solutes (including sugars and amino acids). This, in conjunction with temperature stress, further enhances the formation of sweetness and flavor. It also synergistically regulates root temperature, consolidates the stress effect, and promotes substance transport. Lowering the nutrient solution temperature from 21℃ to 16℃ synchronizes with the lower air temperature, preventing the roots from maintaining vigorous growth due to higher temperatures and consolidating the temperature stress effect on the aboveground parts. On the other hand, the moderately low temperature reduces root activity, which, together with the higher EC value, cleverly inhibits water absorption and is more conducive to the accumulation of dry matter.

[0251] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A multi-stage collaborative control method for indoor vegetable cultivation, characterized in that, include: Step S1: Perform compression pretreatment and screening pretreatment on the selected basic seedling sponge and basic coated seeds respectively to output target seedling sponge and complete coated seeds respectively; wherein, the density of the basic seedling sponge is 25D; the compression pretreatment is to repeatedly squeeze and wash the basic seedling sponge with purified water with a pH of 6 and an EC value of less than 0.1 mS / cm; Step S2: Pour nutrient solution into the seedling tray, soak and squeeze the target seedling sponge placed in the seedling tray, put the complete coated seeds into the holes of the seedling tray, and spray the target seedling sponge with nutrient solution and purified water in sequence to form a seedling tray to be germinated; Step S3: The seedlings to be germinated... The seedling trays are used for germination to form seedling trays with qualified germination rates; Step S4, the germinated seedlings in the seedling trays undergo a first-stage seedling cultivation operation to form a first-stage seedling tray, wherein the daily environmental control parameters for the first-stage seedling cultivation include: from 8:00 to 8:30, temperature 23℃, humidity 75%, LED lighting on, photosynthetically active radiation starting value 70 μmol / m² / s, and uniformly increasing to 210 μmol / m² / s within 30 minutes, carbon dioxide concentration 800 ppm, and vertical ventilation speed 0.3 m / s; from 8:30 to 23:30, temperature 23℃, humidity 75%, photosynthetically active radiation starting value 70 μmol / m² / s, and uniformly increasing to 210 μmol / m² / s within 30 minutes, carbon dioxide concentration 800 ppm, and vertical ventilation speed 0.3 m / s; Photosynthetically active radiation (PARF) is 210 μmol / m² / s, carbon dioxide concentration is 800 ppm, and vertical ventilation velocity is 0.3 m / s. From 23:30 to 00:00, the temperature is 23℃, humidity is 75%, and PARF decreases from 210 μmol / m² / s within one hour until it is completely shut off; carbon dioxide concentration is 800 ppm, and vertical ventilation velocity is 0.3 m / s. From 00:00 to 00:30, the temperature is 23℃, humidity is 75%, carbon dioxide supply is stopped, and vertical ventilation velocity is 0.3 m / s. From 00:30 to 01:00, the temperature decreases from 23℃ to 20℃ within thirty minutes, and humidity remains at 75% for thirty minutes. Within minutes, the humidity rises to 95%; carbon dioxide supply is stopped, and the vertical ventilation velocity decreases to 0.2 m / s within thirty minutes; from 01:00 to 07:00, the temperature is 20℃ and the humidity is 95%; carbon dioxide supply is stopped, and the vertical ventilation velocity is 0.2 m / s; from 07:00 to 07:30, the temperature rises from 20℃ to 23℃ within thirty minutes; the humidity decreases from 95% to 75% within thirty minutes; carbon dioxide supply is stopped, and the vertical ventilation velocity increases to 0.3 m / s within thirty minutes; from 07:30 to 08:00, the temperature is 23℃ and the humidity is 75%; carbon dioxide supply is stopped, and the vertical ventilation velocity is 0.3m / s; Step S5, a stainless steel rooting net and nutrient solution are placed sequentially below the target seedling sponge in the first-stage seedling tray to carry out the second-stage seedling rooting operation, forming a sponge rooting tray. The daily environmental control parameters for the second-stage seedling rooting operation include: from 8:00 to 8:30, temperature 23℃, humidity 75%, LED light on, photosynthetically active radiation starting value 70μmol / m² / s, and uniformly increasing to 210μmol / m² / s within 30 minutes; carbon dioxide concentration 800ppm, vertical ventilation speed 0.4m / s; from 8:30 to 23:30, temperature 23℃, humidity 75%, photosynthetically active radiation value 210μmol / m² / s. At 23:30-00:00, the temperature was 23℃, humidity was 75%, and the photosynthetically active radiation (PAR) decreased uniformly from 210 μmol / m² / s to 0 within half an hour. The carbon dioxide concentration was 800 ppm, and the vertical ventilation velocity was 0.4 m / s. At 00:00-00:30, the temperature was 23℃, humidity was 75%, carbon dioxide supply was stopped, and the vertical ventilation velocity was 0.4 m / s. At 00:30-01:00, the temperature decreased from 23℃ to 20℃, humidity increased uniformly from 75% to 95% within half an hour, carbon dioxide supply was stopped, and the vertical ventilation velocity was... The speed is reduced to 0.2 m / s; during the period from 01:00 to 07:00, the temperature is 20℃, the humidity is 95%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.2 m / s; during the period from 07:00 to 07:30, the temperature rises uniformly from 20℃ to 23℃, the humidity drops uniformly from 95% to 75%, the carbon dioxide supply is stopped, and the vertical ventilation speed increases uniformly to 0.4 m / s; during the period from 07:30 to 08:00, the temperature is 23℃, the humidity is 75%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.4 m / s; wherein, the preset diurnal temperature difference in the second-stage seedling rooting operation is determined based on the change in the average leaf area of ​​the germinating seedlings during the nighttime monitoring period; step S6, dividing the... Sponge rooting trays are used to obtain sponge rooting substrate blocks. These blocks are then transplanted into the planting holes of a primary transplanting tray to form transplanted seedlings. The daily environmental control parameters during the transplanting process include: from 8:00 to 8:30, temperature 23℃, humidity 75%, LED lighting on, photosynthetically active radiation starting at 70 μmol / m² / s and increasing uniformly to 210 μmol / m² / s over 30 minutes, carbon dioxide concentration 800 ppm, and vertical ventilation velocity 0.5 m / s; from 8:30 to 23:30, temperature 23℃, humidity 75%, photosynthetically active radiation 210 μmol / m² / s, carbon dioxide concentration 800 ppm, and vertical ventilation velocity 0.5 m / s; During the period from 23:30 to 00:00, the temperature is 23℃, the humidity is 75%, the photosynthetically active radiation value decreases uniformly from 210 μmol / m² / s over half an hour until it is completely shut off, the carbon dioxide concentration is 800 ppm, and the vertical ventilation speed is 0.5 m / s; During the period from 00:00 to 00:30, the temperature is 23℃, the humidity is 75%, the carbon dioxide supply is stopped, and the vertical ventilation speed is 0.5 m / s; During the period from 00:30 to 01:00, the temperature decreases uniformly from 23℃ to 20℃, the humidity increases uniformly from 75% to 95%, the carbon dioxide supply is stopped, and the vertical ventilation speed decreases to 0.3 m / s; During the period from 01:00 to 07:00, the temperature is 20℃, the humidity is 75%, the photosynthetically active radiation value decreases uniformly from 210 μmol / m² / s over half an hour until it is completely shut off, the carbon dioxide concentration is 800 ppm, and the vertical ventilation speed is 0.3 m / s; At 95% humidity, carbon dioxide supply is stopped, and vertical ventilation speed is 0.3 m / s; from 07:00 to 07:30, the temperature rises uniformly from 20℃ to 23℃, and the humidity decreases uniformly from 95% to 75%; carbon dioxide supply is stopped, and vertical ventilation speed is increased uniformly to 0.5 m / s; from 07:30 to 08:00, the temperature is 23℃, humidity is 75%, carbon dioxide supply is stopped, and vertical ventilation speed is 0.5 m / s; in step S7, the transplanted seedlings and control transplanted seedlings are respectively transplanted and grown to form vegetable seedlings and control vegetable seedlings, wherein the daily environmental control parameters for transplanting the seedlings include: from 8:00 to 8:30, the temperature is 22℃. The humidity was 70%; LED lighting was on, with a starting value of 70 μmol / m² / s for photosynthetically active radiation (PAR), which increased uniformly to 250 μmol / m² / s over 30 minutes; carbon dioxide concentration was 800 ppm; and vertical ventilation velocity was 0.8 m / s. From 8:30 AM to 11:30 PM, the temperature was 22°C, humidity was 70%, PAR was 250 μmol / m² / s, carbon dioxide concentration was 800 ppm, and vertical ventilation velocity was 0.8 m / s. From 11:30 PM to midnight, the temperature was 22°C, humidity was 70%, PAR decreased uniformly from 250 μmol / m² / s until it was completely off; carbon dioxide concentration was 800 ppm; and vertical ventilation velocity was 0.8 m / s. m / s; During the period from 00:00 to 00:30, the temperature is 22℃, the humidity is 70%, carbon dioxide supply is stopped, and the vertical ventilation velocity is 0.8 m / s; During the period from 00:30 to 01:00, the temperature decreases from 22℃ to 20℃ at a constant rate, the humidity increases from 70% to 95%, carbon dioxide supply is stopped, and the vertical ventilation velocity decreases at a constant rate to 0.5 m / s; During the period from 01:00 to 07:00, the temperature is 20℃, the humidity is 95%, carbon dioxide supply is stopped, and the vertical ventilation velocity is 0.5 m / s; During the period from 07:00 to 07:30, the temperature increases from 20℃ to 22℃ at a constant rate, the humidity decreases from 95% to 70% at a constant rate, carbon dioxide supply is stopped, and the vertical ventilation velocity increases to 0.8 m / s; During the period from 07:30 to 08:00, the temperature is 22℃, the humidity is 70%, carbon dioxide supply is stopped, and the vertical ventilation speed is 0.8 m / s; Step S8, according to the target diurnal temperature difference and the target nutrient solution EC value, the planted vegetable seedlings are subjected to temperature stress and nutrient stress respectively during the harvest preparation period to form finished vegetables. The daily environmental control parameters during the harvest preparation period include: during the period from 8:00 to 8:30, the temperature is 20℃, the humidity is 70%, LED lighting is on, and the photosynthetically active radiation starting value is 70 μmol / L. The temperature was 20℃, humidity 70%, and the photosynthetically active radiation (PAR) value was 250 μmol / m² / s, increasing to 250 μmol / m² / s within 30 minutes. The carbon dioxide concentration was 800 ppm, and the vertical ventilation velocity was 0.8 m / s. From 8:30 to 23:30, the temperature was 20℃, humidity 70%, and the PAR value decreased from 250 μmol / m² / s until it was completely shut off. Carbon dioxide concentration 800 ppm, vertical ventilation velocity 0.8 m / s; From 00:00 to 00:30, temperature 20℃, humidity 70%, carbon dioxide supply stopped, vertical ventilation velocity 0.8 m / s; From 00:30 to 01:00, temperature decreases from 20℃ to 16℃, humidity increases from 70% to 95%, carbon dioxide supply stopped, vertical ventilation velocity decreases to 0.5 m / s; From 01:00 to 07:00, temperature 16℃, humidity 95%, carbon dioxide supply stopped, vertical ventilation velocity... The wind speed was 0.5 m / s; from 07:00 to 07:30, the temperature rose from 16℃ to 20℃; humidity decreased from 95% to 70%, carbon dioxide supply was stopped, and the vertical ventilation wind speed was increased to 0.8 m / s; from 07:30 to 08:00, the temperature was 20℃, humidity was 70%, carbon dioxide supply was stopped, and the vertical ventilation wind speed was 0.8 m / s; The target diurnal temperature range was determined based on the difference between the average growth evaluation parameters of the planted vegetable seedlings and the average growth evaluation parameters of the control planted vegetable seedlings during the transplanting and growth operation.

2. The indoor vegetable cultivation method with multi-stage collaborative control according to claim 1, characterized in that, In step S2, the step of sequentially spraying nutrient solution and purified water onto the target seedling sponge to form a seedling tray for germination includes: spraying 200 ml of nutrient solution onto the surface of the target seedling sponge using a pressure sprayer; and spraying 200 ml of purified water onto the surface of the target seedling sponge using a pressure sprayer to form a seedling tray for germination; wherein the nutrient solution has an EC value of 1.5 mS / cm and a pH value of 6; and the purified water has a pH value of 6 and an EC value of less than 0.1 mS / cm.

3. The indoor vegetable cultivation method with multi-stage collaborative control according to claim 2, characterized in that, In step S3, germinating the seedling trays to be germinated involves stacking the seedling trays in multiple layers and placing them in a dark or enclosed germination box for 24 hours. The cultivation environment is controlled according to the environmental control conditions of the germination box, which include maintaining a constant temperature of 23°C, humidity of 85%-95%, no light, and a carbon dioxide concentration of 800ppm in the germination box for 24 hours. A germination rate greater than 95% is considered a qualified germination rate.

4. The indoor vegetable cultivation method with multi-stage collaborative control according to claim 3, characterized in that, Step S4 includes: Step S41, placing the seedling germination tray on the seedling rack; Step S42, evenly spraying 50 ml of nutrient solution with an EC value of 1.5 and a pH of 6 onto the target seedling sponge in the seedling germination tray; Step S43, pulling down the side light-blocking curtain on the seedling rack; Step S44, turning on the LED plant growth light; Step S45, turning on the VAF vertical ventilation device located at the top of the planting layer; Step S46, controlling the cultivation environment according to the daily environmental control parameters for the first stage of seedling cultivation to form the first stage seedling tray; wherein, if the leaf coverage area ratio in the seedling germination tray is greater than or equal to the preset area ratio, the vertical ventilation speed of the seedling germination tray is increased.

5. The indoor vegetable cultivation method with multi-stage collaborative control according to claim 4, characterized in that, In step S7, the process of forming the control vegetable seedlings includes: selecting a control single-transplanting tray, placing a sponge rooting substrate block into the control single-transplanting tray, performing control transplanting and growth operations, and continuing the transplanting and growth operations of the control transplanted seedlings according to a preset diurnal temperature difference and a preset nutrient solution EC value during the control monitoring period before the end of the transplanting and growth cycle, so as to form control vegetable seedlings; wherein, if the difference between the average growth evaluation parameters of the control vegetable seedlings and the average growth evaluation parameters of the planted vegetable seedlings during the transplanting and growth operation is greater than a preset difference, the diurnal temperature difference during the harvest preparation period is reduced to the target diurnal temperature difference; the control transplanted seedlings and the transplanted seedlings both come from the same sponge rooting tray.

6. The indoor vegetable cultivation method with multi-stage collaborative control according to claim 5, characterized in that, The average growth evaluation parameter of the vegetable seedlings planted in the transplanting and growth operation is the ratio of the sum of the growth evaluation parameters of all vegetable seedlings planted in the transplanting and growth operation to the total number of vegetable seedlings planted; wherein, the growth evaluation parameter Q of the i-th vegetable seedling is... i The calculation formula is: Where A is the ratio of the crown width of the i-th vegetable seedling to the maximum normal crown width, α is the crown width ratio weighting coefficient, B is the ratio of the number of leaves of the i-th vegetable seedling to the maximum normal number of leaves of a single vegetable seedling, β is the leaf number ratio weighting coefficient, C is the ratio of the total leaf area of ​​the i-th vegetable seedling to the total area of ​​the maximum normal leaves, γ is the leaf area ratio weighting coefficient, D is the ratio of the growth height of the i-th vegetable seedling to the maximum normal growth height, and δ is the growth height ratio weighting coefficient; α+β+γ+δ=1.

7. The indoor vegetable cultivation method with multi-stage collaborative control according to claim 6, characterized in that, In step S5, the stainless steel rooting net is the same size as the basic seedling sponge; the nutrient solution has a volume of 1000 ml, an EC value of 1.5 mS / cm, a pH value of 6.0, and the liquid level of the nutrient solution does not exceed the height of the stainless steel net and does not contact the target seedling sponge; the target seedling sponge is above the stainless steel rooting net; wherein, if the change in the average leaf area of ​​the germinating seedlings during the night monitoring period is less than or equal to the preset change, the preset diurnal temperature difference is increased.

8. The indoor vegetable cultivation method with multi-stage collaborative control according to claim 7, characterized in that, Step S6 includes: Step S61, breaking down the target seedling sponge in each 100-cell sponge rooting tray into 100 individual sponge rooting substrate blocks; Step S62, taking a sponge rooting substrate block containing a seedling and soaking the roots in a container of purified water with the seedling facing upwards and the roots downwards; Step S63, inserting the soaked sponge rooting substrate block into the planting hole of a primary transplanting tray containing nutrient solution so that the roots come into contact with the nutrient solution, so that after the transplanting growth period, transplanted seedlings are formed.

9. The indoor vegetable cultivation method with multi-stage collaborative control according to claim 8, characterized in that, Step S7 includes: Step S71, taking out several transplanted seedlings from a transplanting tray; Step S72, immersing the roots of several transplanted seedlings downwards in purified water; Step S73, placing the soaked transplanted seedlings into the planting holes of the planting tray for planting and cultivation; Step S74, controlling the cultivation environment according to the daily environmental control parameters for planting.

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