Tomato seedling raising method

Abstract

The invention provides a tomato seedling raising method which is characterized by comprising a variety selection step, a substrate preparation step, a sowing step and a seedling stage management step. Wherein the seedling stage management comprises temperature management, moisture and humidity management and nutrient management. Through temperature management, the seedlings can adapt to certain temperature fluctuation in the early growth stage, and therefore the stress resistance of the seedlings to the external environment is improved. Moisture and humidity management promotes healthy development of the root system, and the moisture utilization efficiency is improved. Nutrient management ensures that tomato seedlings obtain balanced nutrient supply in the growth process by adjusting the concentration of nitrogen fertilizer and monopotassium phosphate in stages, so that robust growth of the seedlings is promoted, and the stress resistance is enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of tomato planting, and more specifically to a tomato seedling raising method. Background Art

[0002] In modern agricultural production, tomato is an important vegetable crop, and its yield and quality are directly related to the economic benefits of farmers and the health needs of consumers. With the continuous advancement of agricultural technology, tomato seedling technology is becoming more and more mature, but how to further improve seedling efficiency, shorten the growth cycle, and increase yield is still an important issue facing current agricultural production.

[0003] Traditional tomato seedling raising methods often have problems such as long growth cycle, cumbersome management, and susceptibility to environmental influences, which are difficult to meet the needs of modern agriculture for high efficiency, high quality, and high yield. Therefore, developing an efficient, simple, and easy-to-manage tomato seedling raising method is of great significance to improving the overall competitiveness of the tomato industry.

[0004] Therefore, it is necessary to provide a tomato seedling raising method to at least partially solve the above problems. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, the present application provides a tomato seedling raising method, comprising the following steps:

[0007] S1. Variety selection: select very early-maturing tomato varieties with a growth period of less than 95 days and a peak flowering period of 35-45 days, and keep them for future use;

[0008] S2, substrate preparation: placing the substrate in the plug tray;

[0009] S3, sowing: sowing seeds into the substrate;

[0010] S4. Seedling management, which includes temperature management, water and humidity management, and nutrient management.

[0011] (1) Temperature management includes:

[0012] Before tomato seedlings emerge, the daytime temperature is 20-25°C and the nighttime temperature is 12-16°C;

[0013] From the time tomato seedlings emerge until the third true leaf unfolds, the daytime temperature is 20℃~28℃ and the nighttime temperature is 12℃~16℃;

[0014] (2) Moisture and humidity management includes:

[0015] Water thoroughly in the morning, and water the seedlings that are seriously drought-stricken in the afternoon;

[0016] (3) Nutrient management includes: Fertilization starts after the first true leaf unfolds, including:

[0017] For 1 to 2 true leaves, apply nitrogen fertilizer at a concentration of 60 to 150 mg / kg, and potassium dihydrogen phosphate at a concentration of 150 to 200 mg / kg;

[0018] For plants with more than 2 true leaves, the concentration of nitrogen fertilizer applied should be 200-300 mg / kg, and the concentration of potassium dihydrogen phosphate applied should be 500-600 mg / kg.

[0019] According to this scheme, temperature management can adapt seedlings to certain temperature fluctuations at the beginning of growth, thereby improving their resistance to external environment stress. Water and humidity management promotes healthy root development and improves water use efficiency. Nutrient management ensures that tomato seedlings receive a balanced nutrient supply during growth by adjusting the concentration of nitrogen fertilizer and potassium dihydrogen phosphate in stages, thereby promoting the robust growth of seedlings and enhancing stress resistance.

[0020] Optionally, the tomato variety is Tunhe No. 9.

[0021] Optionally, the step S2 further includes:

[0022] S21. Sprinkle water evenly on the substrate until it can be held in the hand without dripping water and falls apart when touched to the ground;

[0023] S22. Place the matrix in the hole tray and scrape off excess matrix with a flat plate until the wells of the hole tray can be seen.

[0024] Optionally, the step S3 further includes:

[0025] S31, pressing out a depression with a depth of 1.0 to 1.5 cm and a diameter of 1.0 to 1.5 cm in the center of the matrix of each well of the plug tray after loading;

[0026] S32, sowing 1 to 2 seeds in each of the depressions after the tray is loaded;

[0027] S33. Cover the depression after sowing with the matrix and scrape off the excess matrix with a flat plate.

[0028] Optionally, step S2 and step S3 are completed by a dedicated sowing machine.

[0029] Optionally, the temperature management in step S4 further includes: gradually removing the sunshade net from the time when 3 true leaves appear to before transplanting.

[0030] Optionally, the nutrient management in step S4 further includes: spraying clean water after each fertilization.

[0031] Optionally, the method further includes transplanting, and hardening the seedlings is performed 7 to 10 days before transplanting.

[0032] Optionally, when the emergence rate of seedlings in the plug tray is lower than 90%, the seedlings are supplemented when they have two true leaves.

[0033] Optionally, an acceptance step is also included, and the acceptance step includes:

[0034] Check whether the seedlings are less than 5 leaves and one heart, whether the stem thickness is less than 5mm, whether the height of the seedlings including the substrate is below 23cm, whether they are diseased seedlings, whether they are weak seedlings, whether there are malignant parasitic weed seedlings, and whether the hole rate is less than 5%. DETAILED DESCRIPTION

[0035] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application embodiments can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application embodiments, some technical features well known in the art are not described.

[0036] Unless otherwise stated, the numerical ranges herein include not only the entire range within its two endpoints but also include several sub-ranges contained therein.

[0037] Now, exemplary embodiments according to the present application will be described in more detail. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concept of these exemplary embodiments to those of ordinary skill in the art.

[0038] The present application provides a tomato seedling raising method, which at least includes a variety selection step, a substrate preparation step, a sowing step and a seedling management step.

[0039] In the variety selection step, an extremely early-maturing tomato variety with a growth period of less than 95 days and a peak flowering period within 35-45 days is selected for standby use. Optionally, the tomato variety is one of Tunhe No. 9, HF228, Asia Pacific 1708, and IVF3311. By selecting an extremely early-maturing tomato variety with a short growth period and an early peak flowering period, the growth cycle of tomatoes can be greatly shortened and the efficiency of seedling cultivation can be improved. At the same time, this selection also ensures the early maturity of tomatoes and meets the market demand for fresh tomatoes.

[0040] In the matrix preparation step, the matrix is ​​placed in a plug tray. The matrix preparation step specifically includes: evenly sprinkling water on the matrix until it can be held in a hand without dripping and falls apart when dropped to the ground; placing the matrix in the plug tray and scraping off excess matrix with a flat plate until the holes of the plug tray can be seen. Evenly sprinkling water on the matrix and controlling its humidity provide a good growth environment for tomato seeds, help the seeds germinate quickly, and promote the healthy growth of seedlings.

[0041] In the sowing step, seeds are sown into the matrix. The sowing step specifically includes: pressing a depression with a depth of 1.0 to 1.5 cm and a diameter of 1.0 to 1.5 cm in the center of the matrix of each hole of the plug tray after the tray is loaded; sowing 1 to 2 seeds in each depression after the tray is loaded; covering the depression after sowing with the matrix, and scraping off the excess matrix with a flat plate. By pressing depressions in the holes of the plug tray and sowing accurately, the uniform distribution of seeds and the appropriate growth space are ensured, which is conducive to the neat growth of seedlings and reduces the occurrence of weak and diseased seedlings.

[0042] Optionally, a special sowing machine is used to place the matrix in the plug tray and sow the seeds into the matrix. Using a special sowing machine for matrix preparation and sowing greatly improves work efficiency and reduces manual operation errors. At the same time, mechanical sowing also ensures uniformity and consistency of sowing.

[0043] The seedling management steps include temperature management, water and humidity management, and nutrient management.

[0044] Among them, temperature management includes: the daytime temperature before tomato seedlings emerge is 20-25℃, and the nighttime temperature is 12-16℃; after tomato seedlings emerge until the third true leaf unfolds, the daytime temperature is 20℃-28℃, and the nighttime temperature is 12℃-16℃. Appropriate temperature management can enable seedlings to adapt to certain temperature fluctuations in the early stages of growth, thereby improving their resistance to the external environment. Specifically, a daytime temperature of 20-25℃ before emergence is conducive to seed respiration and enzyme activity, promotes physiological metabolism inside the seeds, and thus accelerates the germination process; a nighttime temperature of 12-16℃ can prevent excessive respiration caused by high temperatures, consume too much energy, and help maintain the vitality of seeds and prepare for emergence. From the time the seedlings emerge until the third true leaf unfolds, raising the daytime temperature to 20℃~28℃ can speed up the photosynthesis rate of the seedlings, promote the synthesis and accumulation of nutrients, and is beneficial to the healthy growth of the seedlings; at the same time, maintaining a temperature of 12℃~16℃ at night can help reduce the respiratory consumption of the seedlings and accumulate more energy for growth and development.

[0045] Temperature management also includes: gradually removing the shade net from the time when the tomato seedlings have 3 true leaves to before transplanting. When the tomato seedlings have 3 true leaves, their photosynthesis capacity is relatively strong. At this time, gradually removing the shade net can increase the light intensity received by the seedlings, thereby promoting photosynthesis.

[0046] Water and humidity management includes: watering thoroughly in the morning and spot-watering seedlings in severe drought in the afternoon. Watering in the morning can avoid the high temperature period at noon, and it is beneficial to keep the soil or substrate moist after watering, while preventing seedling damage caused by high water temperature or rapid evaporation of water after watering; watering thoroughly helps to fully moisten the soil or substrate, so that the roots of tomato seedlings can fully absorb water and nutrients, thereby promoting the healthy development of the root system. Spot-watering seedlings in severe drought in the afternoon can accurately meet the needs of seedlings that need additional water, while avoiding the waste caused by indiscriminate watering of all seedlings. This precise watering method helps save water resources and improve water use efficiency.

[0047] Nutrient management includes: Fertilization starts after the first true leaf unfolds, including: 1-2 true leaves apply nitrogen fertilizer at a concentration of 60-150 mg / kg, which helps promote the growth of leaves and stems of seedlings and lays a good foundation for subsequent growth and development. 1-2 true leaves apply potassium dihydrogen phosphate at a concentration of 150-200 mg / kg to provide necessary phosphorus and potassium elements, promote root development, and enhance the stress resistance of seedlings. 200-300 mg / kg nitrogen fertilizer is applied to more than 2 true leaves to meet the nitrogen demand of seedlings for rapid growth, promote lush leaves and enhance photosynthesis. 500-600 mg / kg potassium dihydrogen phosphate is applied to more than 2 true leaves to ensure sufficient supply of phosphorus and potassium elements and promote nutrient absorption and utilization. By adjusting the concentrations of nitrogen fertilizer and potassium dihydrogen phosphate, the seedlings can obtain a balanced nutrient supply during the growth process and avoid growth problems caused by excess or deficiency of a single nutrient.

[0048] Nutrient management also includes: spraying clean water after each fertilization. Spraying clean water after fertilization helps to evenly dissolve the nutrients in the fertilizer in the soil, making the nutrients easier to be absorbed by the roots of the tomato seedlings, which can not only improve the utilization rate of nutrients, but also ensure that the seedlings receive a balanced supply of nutrients. Spraying clean water can form a layer of water film covering the soil surface, reducing the volatilization and loss of nutrients, helping to maintain the nutrient content in the soil and ensuring that the seedlings can continue to receive sufficient nutrient supply.

[0049] It also includes planting, and hardening the seedlings 7 to 10 days before planting. Hardening the seedlings before planting can improve the stress resistance and adaptability of the seedlings, so that they can better adapt to the growth environment after transplanting, help reduce the phenomenon of seedling death after transplanting, and improve the survival rate.

[0050] When the seedling emergence rate of the plug tray is less than 90%, the seedlings should be supplemented when they have two true leaves. Supplementing seedlings when the seedlings have two true leaves can ensure the full utilization of the plug tray, reduce the empty hole rate, and help improve the economic benefits and yield of seedling cultivation.

[0051] It also includes an acceptance step, which includes: checking whether the seedling age is less than 5 leaves and one heart, whether the stem thickness is less than 5 mm, whether the height of the seedlings containing the matrix is ​​below 23 cm, whether it is a diseased seedling, whether it is a weak seedling, whether there are malignant parasitic weed seedlings, and whether the hole rate is less than 5%.

[0052] The following is an explanation through specific examples.

[0053] 1. Seedling facilities

[0054] (I) Seedling raising site. Seedlings should be raised in a solar greenhouse or multi-span greenhouse equipped with shading and cooling facilities. Before raising seedlings, clean the greenhouse and level the seedbed for placing the plug trays. Optionally, raise the plug trays to a height of no less than 30 cm from the ground.

[0055] (II) Seedling medium. You can choose a vegetable seedling medium with high market popularity. You can also use decomposed mushroom sticks and farm soil to prepare the seedling medium yourself. Ensure that the medium has good water retention and aeration, uniform nutrient content and particle size, and a pH value and soluble salt concentration suitable for tomato seedlings. The medium needs to be harmless.

[0056] (III) Plug tray. Using a 72-hole large plug tray for seedling cultivation can better balance the quality of processed tomato seedlings and the cost of seedling cultivation. A small amount of 50-hole plug trays can be used for comparative experiments.

[0057] 2. Sowing

[0058] (I) Varieties and seed quantity. Select a variety with a growth period of less than 95 days from transplanting to harvesting, high temperature resistance during flowering and fruiting, strong root vitality, and the ability to bloom and bear fruit as quickly as possible after planting, reaching the peak flowering period within 35-45 days. In this embodiment, the variety used is Tunhe No. 9.

[0059] Each mu of seedlings requires 15 grams of seeds. The seeds used for plug tray seeding should be processed and selected, and the seed germination rate should reach more than 95%.

[0060] (II) Sowing time. The seedling age of spring-sown processing tomato seedlings in plug trays is 40 to 45 days. Considering the short growth period of transplanting after wheat, large seedlings are transplanted to achieve early maturity. The planting is completed before June 25. The sowing period is calculated backwards according to the seedling age of 50-55 days. The sowing time in the greenhouse is selected from May 5 to May 10.

[0061] (III) Sowing

[0062] Sprinkle water evenly on the substrate until it is moistened to a suitable degree. Optionally, the substrate can be held in a ball without dripping and will fall apart when dropped to the ground. Manually place the substrate on the tray and scrape off the excess substrate with a flat plate, so that the holes of the tray can be seen. After placing the trays, align and stack every 10 to 15 trays, press a depression of 1.0 to 1.5 cm in depth in the center of the hole, or use a special punching tool to punch a sowing hole of 1 cm in depth and 1.5 cm in diameter in the center of the hole. When sowing manually, plant 1 to 2 seeds per hole. Cover the substrate after sowing and scrape off the excess substrate with a flat plate.

[0063] Or use a special seeding machine to complete the tray loading, sowing and soil covering at one time.

[0064] 3. Post-sowing and pre-seedling management

[0065] After sowing, the plug trays are placed together, and fine sand or non-woven fabrics are laid on the seedbed to prevent the roots of the seedlings from extending out of the bottom of the plug tray and entering the soil. The sprinkler system is reasonably arranged to spray water evenly until the plug trays are irrigated.

[0066] The suitable temperature for germination of processing tomato seeds is 28-30℃. From sowing to germination, 28-32℃ during the day and 15-20℃ at night in the greenhouse are conducive to faster and uniform germination. When the temperature in the greenhouse exceeds 35℃, it is necessary to put down a heat insulation blanket or sunshade to cool down.

[0067] Before germination, based on the temperature in the greenhouse and the moisture content of the substrate in the hole tray, water is sprayed every day to adjust the relative moisture content of the soil 1 cm below the surface of the substrate in the hole to meet the germination requirements.

[0068] 4. Seedling Management

[0069] 1. Temperature management

[0070] The suitable temperature range for the growth and development of tomato seedlings is 20-25°C during the day and 12-16°C at night. If the temperature in the greenhouse is too high, it will accelerate the evaporation of water in the substrate in the plug tray, increase the frequency of plug tray irrigation, and accelerate the loss of substrate nutrients, which is not conducive to the accumulation of nutrients in the tomato seedlings.

[0071] From the time tomato seedlings emerge until the third true leaf unfolds, the greenhouse temperature is 20℃~28℃ during the day and 12℃~16℃ at night. When the temperature is too high, shade nets or spray ventilation measures should be taken to cool it down.

[0072] From the time the seedlings have 3 true leaves to before transplanting, they enter the seedling hardening period. Gradually remove the shade nets to harden the seedlings so that they can gradually adapt to strong light, strengthen ventilation management, and gradually adapt to the open air environment.

[0073] (II) Moisture and humidity management

[0074] Water management is the key to the success of seedling cultivation in plug trays. Plug tray seedlings should be watered thoroughly in the morning, and seedlings that are severely drought-prone should be watered in the afternoon. When spraying water, it is important to moisten the entire substrate of the plug tray. If the plug tray is often not watered thoroughly, it will inhibit root growth and affect the normal development of the seedlings. Frequent spraying will accelerate the leaching of nutrients in the substrate, making the plants prone to leggy growth, thin stems, and long internodes, increasing the chance of disease.

[0075] When spraying water, adjust and arrange the position and height of the micro sprinkler in time according to the spraying range of the water, check whether the size of the micro sprinkler nozzles is consistent and whether there is any blockage, so as to ensure that the water spray is evenly distributed and the seedlings grow and develop uniformly.

[0076] (III) Nutrient management

[0077] Tomatoes require nitrogen and potassium in equal amounts, and phosphorus in only about 1 / 8 to 1 / 5 of nitrogen and potassium. Excessive water spraying can easily wash out potassium. When the nitrogen content in the formula fertilizer is twice or more than the potassium content, and when the sodium content in the irrigation water is higher than 40 mg / kg, potassium absorption will be inhibited, causing the seedlings to grow too long. Therefore, the fertilization plan needs to maintain a balance between potassium and nitrogen and use a water source with good water quality.

[0078] Start fertilizing after the first true leaf unfolds. It is recommended to fertilize the seedlings 1 to 2 times a week, with nitrogen fertilizer concentrations of 60 to 150 mg / kg for 1 to 2 true leaves, 200 to 300 mg / kg for more than 2 true leaves, and 150 to 200 mg / kg of potassium dihydrogen phosphate for 1 to 2 true leaves, 500 to 600 mg / kg for more than 2 true leaves, spray on the leaves.

[0079] Spray clean water after each fertilization to avoid pesticide damage. Do not fertilize when it is cloudy. After hardening the seedlings, reduce the amount of water spraying and fertilization.

[0080] (IV) Replanting. If the emergence rate of seedlings in plug trays is less than 90%, replanting should be done in time when the seedlings have two true leaves. After replanting, shade and water should be provided in time.

[0081] (V) Move the tray. The seedling tray is placed on the seedbed and should be moved 2 to 3 times during the seedling raising period to prevent the roots from entering the soil layer and to promote the roots in the plug tray to better wrap the substrate.

[0082] (VI) Hardening the seedlings. 7 to 10 days before planting, make the temperature in the nursery area close to the planting environment so that the seedlings in the plug trays begin to adapt to the external climate. At the same time, moderately reduce the amount of water spraying and fertilization to increase the tolerance of the plug tray seedlings to water stress. Excessive hardening of the seedlings will require more time to slow down after planting in the production field.

[0083] (VII) Disease prevention and control. Damping-off disease, stem base rot, and bacterial diseases are common seedling diseases of processing tomato plug seedlings.

[0084] When the temperature and humidity in the greenhouse are high, it is easy to be infected with damping-off disease. In the middle and late stages of seedling cultivation, the seedlings are relatively dark. The amount of water sprayed is large, and the relative humidity of the air in the microenvironment is high, which makes it easier for seedling diseases such as stem base rot and bacterial spot disease to occur.

[0085] Lowering the temperature and relative humidity in the nursery area and carefully managing water in the later stages of nursery are the most economical and effective ways to prevent the occurrence of the above-mentioned diseases.

[0086] When the disease is serious, in addition to taking the above measures, select pesticides allowed by the processing company for immediate prevention and control. Increase the standard for seedlings leaving the greenhouse.

[0087] Acceptance criteria for tomato seedlings before leaving the greenhouse: No detection of "two elements" in the sampling test of seedlings before leaving the greenhouse. Seedling age is not less than 5 leaves and one heart, the stem thickness is not less than 5mm, and the seedling height (including the substrate) is controlled below 23 cm. There are no diseased seedlings, weak seedlings, or seedlings with malignant parasitic weeds. The hole rate is less than 5%. Among them, the 5-point method is adopted for random sampling, and 5 trays are continuously drawn at each point, for a total of 25 trays, and the number of holes is manually counted to calculate the hole rate.

[0088] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of this application. The terms used herein are only for describing specific implementation purposes and are not intended to limit this application. Terms such as "setting" appearing in this article can mean that one component is directly attached to another component, or that one component is attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0089] The present application has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present application to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the present application, and these variations and modifications all fall within the scope of protection claimed in the present application.

Claims

1. A tomato seedling raising method, characterized in that: The following steps are involved: S1. Variety selection: select very early-maturing tomato varieties with a growth period of less than 95 days and a peak flowering period of 35-45 days, and keep them for future use; S2, substrate preparation: placing the substrate in the plug tray; S3, sowing: sowing seeds into the substrate; S4. Seedling management, which includes temperature management, water and humidity management, and nutrient management. (1) Temperature management includes: Before tomato seedlings emerge, the daytime temperature is 20-25°C and the nighttime temperature is 12-16°C; From the time tomato seedlings emerge until the third true leaf unfolds, the daytime temperature is 20℃~28℃ and the nighttime temperature is 12℃~16℃; (2) Moisture and humidity management includes: Water thoroughly in the morning, and water the seedlings that are seriously drought-stricken in the afternoon; (3) Nutrient management includes: Fertilization starts after the first true leaf unfolds, including: For 1 to 2 true leaves, apply nitrogen fertilizer at a concentration of 60 to 150 mg / kg, and potassium dihydrogen phosphate at a concentration of 150 to 200 mg / kg; For plants with more than 2 true leaves, the concentration of nitrogen fertilizer applied should be 200-300 mg / kg, and the concentration of potassium dihydrogen phosphate applied should be 500-600 mg / kg.

2. The tomato seedling raising method according to claim 1, characterized in that: The tomato variety is Tunhe No.

9.

3. The tomato seedling raising method according to claim 1, characterized in that: The step S2 further comprises: S21. Sprinkle water evenly on the substrate until it can be held in the hand without dripping water and falls apart when touched to the ground; S22. Place the matrix in the hole tray and scrape off excess matrix with a flat plate until the wells of the hole tray can be seen.

4. The tomato seedling raising method according to claim 1, characterized in that: The step S3 further comprises: S31, pressing out a depression with a depth of 1.0 to 1.5 cm and a diameter of 1.0 to 1.5 cm in the center of the matrix of each well of the plug tray after loading; S32, sowing 1 to 2 seeds in each of the depressions after the tray is loaded; S33. Cover the depression after sowing with the matrix and scrape off the excess matrix with a flat plate.

5. The tomato seedling raising method according to claim 1, characterized in that: The steps S2 and S3 are completed by a special seeding machine.

6. The tomato seedling raising method according to claim 1, characterized in that: The temperature management in step S4 also includes: gradually removing the sunshade net from the time when there are 3 true leaves to before transplanting.

7. The tomato seedling raising method according to claim 1, characterized in that: The nutrient management in step S4 also includes: spraying clean water after each fertilization.

8. The tomato seedling raising method according to claim 1, characterized in that: It also includes transplanting, and the seedlings must be hardened 7 to 10 days before transplanting.

9. The tomato seedling raising method according to claim 1, characterized in that: When the emergence rate of seedlings in plug trays is lower than 90%, seedlings should be supplemented when they have two true leaves.

10. The tomato seedling raising method according to claim 1, characterized in that: The acceptance step also includes: Check whether the seedlings are less than 5 leaves and one heart, whether the stem thickness is less than 5mm, whether the height of the seedlings including the substrate is below 23cm, whether they are diseased seedlings, whether they are weak seedlings, whether there are malignant parasitic weed seedlings, and whether the hole rate is less than 5%.