Aerosol culture nutrient solution for fruit cucumbers suitable for weakly alkaline water sources and preparation process thereof

Abstract

The invention relates to the technical field of agricultural cultivation, and discloses an aeroponic nutrient solution for fruit cucumbers suitable for weakly alkaline water sources and a preparation process. The aeroponic nutrient solution comprises the following components: per liter of water, urea phosphate: 200-300 mg; magnesium sulfate heptahydrate: 350-400 mg; DTPA chelated iron: 30-40 mg; boric acid: 4-6 mg; ammonium molybdate: 0.05-0.2 mg; copper sulfate pentahydrate: 1-3 mg; zinc sulfate heptahydrate: 2-3 mg; manganese sulfate monohydrate: 2-3 mg; calcium ammonium nitrate: 300-400 mg; potassium magnesium nitrate: 400-500 mg, nitrogen (N): 140-160 mg / L; phosphorus (P): 45-50 mg / L; potassium (K): 140-160 mg / L. The invention uses a DTPA chelating agent to prevent the precipitation of trace elements, combines citric acid or malic acid to stabilize the pH value of the nutrient solution, and improves solubility and stability. Supplement potassium bicarbonate during the fruiting period to meet potassium needs, enhance fruit sugar accumulation and quality, optimize nutrient absorption efficiency, and comprehensively improve crop yield and quality.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural cultivation, in particular to an aerosol culture nutrient solution for fruit cucumbers suitable for weakly alkaline water sources and a preparation process thereof. Background Art

[0002] As a high-quality economic crop, fruit cucumber has high requirements for the quality and stability of nutrient solution, especially in the aeroponic cultivation mode, where its growth depends on the precise supply of water and nutrients. For weakly alkaline water sources, the properly formulated aeroponic cultivation nutrient solution needs to have good solubility, stability and applicability while meeting the growth needs of plants, so as to avoid insufficient nutrient supply or failure due to water quality problems.

[0003] In the existing technology, aerosol cultivation nutrient solution achieves a balanced supply of nutrient elements by optimizing the ratio of macroelements (such as nitrogen, phosphorus, potassium, magnesium, calcium, etc.) and trace elements (such as iron, zinc, manganese, etc.), and combines advanced atomization technology to provide an efficient water vapor environment for plant roots. These nutrient solutions show good solubility and stability in neutral or weakly acidic water sources, can meet the growth needs of most cash crops, have the advantages of high nutrient utilization rate and reduced soil pollution, and promote the development of modern agriculture.

[0004] However, the existing aerosol cultivation nutrient solution has shortcomings under weakly alkaline water source conditions: trace elements (such as iron, manganese, and zinc) are easily precipitated with carbonate or phosphate in an alkaline environment, resulting in nutrient ineffectiveness; the pH value of the nutrient solution fluctuates greatly, and there is a lack of effective regulation mechanism, which affects the plant's absorption efficiency of nutrients; during the crop fruiting period, the nutrient solution has weak targeting for improving fruit quality and fails to fully meet the cultivation needs of high-sugar fruit cucumbers. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides an aerosol culture nutrient solution for fruit cucumbers suitable for weakly alkaline water sources and a preparation process, which solves the problems of trace element precipitation, pH value fluctuation and low nutrient absorption efficiency in the aerosol culture nutrient solution under weakly alkaline water source conditions in the prior art.

[0006] To achieve the above purpose, the present invention is implemented by the following technical scheme: a fruit cucumber aerosol cultivation nutrient solution suitable for weakly alkaline water sources, the aerosol cultivation nutrient solution comprising the following components:

[0007] Each liter of water contains: urea phosphate: 200-300 mg; magnesium sulfate heptahydrate: 350-400 mg; DTPA chelated iron: 30-40 mg; boric acid: 4-6 mg; ammonium molybdate: 0.05-0.2 mg; copper sulfate pentahydrate: 1-3 mg; zinc sulfate heptahydrate: 2-3 mg; manganese sulfate monohydrate: 2-3 mg; calcium ammonium nitrate: 300-400 mg; potassium magnesium nitrate: 400-500 mg.

[0008] Preferably, the concentration of each element in the aerosol culture nutrient solution after dilution is:

[0009] Nitrogen (N): 140-160 mg / L; Phosphorus (P): 45-50 mg / L; Potassium (K): 140-160 mg / L; Calcium (Ca): 60-70 mg / L; Magnesium (Mg): 35-45 mg / L; Sulfur (S): 60-70 mg / L; Iron (Fe): 3.5-4.0 mg / L; Boron (B): 0.7-1.0 mg / L; Zinc (Zn): 0.4-0.6 mg / L; Manganese (Mn): 0.7-1.0 mg / L; Copper (Cu): 0.4-0.6 mg / L; Molybdenum (Mo): 0.04-0.06 mg / L.

[0010] The present invention also provides a process for preparing aerosol nutrient solution for cultivating cucumber fruits suitable for weakly alkaline water sources, comprising the following steps:

[0011] S1. Water quality regulation;

[0012] S2, raw material dissolution;

[0013] S3, mother liquor separation and storage;

[0014] S4. Dilution of nutrient solution.

[0015] Preferably, the water quality adjustment includes:

[0016] Determine the pH, hardness and total dissolved solids of water sources;

[0017] When the pH value is 7.5-8.5, a regulator is added to adjust the pH to 5.5-6.5, wherein:

[0018] When pH>8.0, add 0.5-1.0 mL / L of phosphoric acid;

[0019] When the pH is 7.5-8.0, add 1-2 g / L of citric acid as a buffer;

[0020] Circulate and stir the adjusted water for 5 to 10 minutes and measure again to ensure that the pH and hardness meet the requirements.

[0021] Preferably, the raw material dissolution comprises:

[0022] Add the ingredients in the following order, stirring for 3 to 5 minutes after each ingredient is dissolved:

[0023] Phase 1: Urea phosphate;

[0024] Stage 2: magnesium sulfate heptahydrate, magnesium potassium nitrate, calcium ammonium nitrate;

[0025] Phase III: DTPA chelated iron, boric acid, ammonium molybdate, copper sulfate pentahydrate, zinc sulfate heptahydrate, manganese sulfate monohydrate;

[0026] Add phosphoric acid or nitric acid to adjust the pH of the nutrient solution to 5.5-6.5.

[0027] Preferably, the mother liquor separation comprises:

[0028] The dissolved nutrient solution is divided into liquid A, liquid B and liquid C mother solution, the components are:

[0029] Solution A: urea phosphate, magnesium sulfate heptahydrate, magnesium potassium nitrate, dilution ratio is 1:200;

[0030] Solution B: calcium ammonium nitrate, dilution ratio 1:200;

[0031] Solution C: DTPA chelated iron, boric acid, ammonium molybdate, copper sulfate pentahydrate, zinc sulfate heptahydrate, manganese sulfate monohydrate, dilution ratio is 1:5000;

[0032] Store each stock solution in a sealed container and protect from light.

[0033] Preferably, the nutrient solution dilution comprises:

[0034] Dilute the stock solution to the working solution in the following proportions:

[0035] Dilute solution A and solution B to 200 times;

[0036] Solution C was diluted to 5000 times;

[0037] The target EC value of the diluted nutrient solution is 1.5-2.5 mS / cm, and the target pH value is 5.5-6.5.

[0038] Preferably, 2 to 5 g / L potassium bicarbonate is additionally added to the nutrient solution during the fruiting period to improve the sugar content and quality of the fruit cucumber.

[0039] Preferably, the nutrient solution is used for atomization spraying in an aeroponic device, the atomization particle size is controlled at 20 to 50 μm, the spraying frequency is 2 to 4 times per hour, and each time lasts for 5 to 10 seconds.

[0040] Preferably, the nutrient solution uses a DTPA chelating agent in a weakly alkaline environment to prevent precipitation of trace elements; and a buffer is formed by adding citric acid or malic acid to stabilize the pH value of the nutrient solution.

[0041] The invention provides a fruit cucumber aerosol culture nutrient solution suitable for weakly alkaline water sources and a preparation process thereof.

[0042] It has the following beneficial effects:

[0043] 1. The present invention prevents the precipitation of trace elements in a weakly alkaline environment by using DTPA chelating agent and buffer, while stabilizing the pH value of the nutrient solution, improving the solubility and stability of each component in the nutrient solution, and ensuring the efficient absorption of macro and trace elements by plants.

[0044] 2. The present invention forms a buffer by adding citric acid or malic acid, which effectively regulates and stabilizes the pH value of the nutrient solution, so that it is always maintained in the optimal range of 5.5 to 6.5, thereby improving the solubility and bioavailability of nutrients and significantly enhancing the adaptability of the nutrient solution to external water quality fluctuations.

[0045] 3. The present invention adds potassium bicarbonate in an appropriate amount during the fruiting period to provide an efficient potassium source for fruit cucumbers, enhance the accumulation and quality of sugar in the fruit, and further improve the nutrient absorption efficiency in the root zone and the commercial quality of the fruit, thereby meeting the planting needs of high yield and high quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a stereogram of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Please refer to the attached Figure 1 The embodiment of the present invention provides an aerosol cultivation nutrient solution for fruit cucumbers suitable for weakly alkaline water sources, and the aerosol cultivation nutrient solution includes the following components:

[0049] Each liter of water contains: urea phosphate: 200-300 mg; magnesium sulfate heptahydrate: 350-400 mg; DTPA chelated iron: 30-40 mg; boric acid: 4-6 mg; ammonium molybdate: 0.05-0.2 mg; copper sulfate pentahydrate: 1-3 mg; zinc sulfate heptahydrate: 2-3 mg; manganese sulfate monohydrate: 2-3 mg; calcium ammonium nitrate: 300-400 mg; potassium magnesium nitrate: 400-500 mg.

[0050] Among them, urea phosphate can provide nitrogen and phosphorus elements necessary for plants while adjusting the pH of weakly alkaline water sources, avoiding precipitation and significantly improving the stability of the nutrient solution; magnesium sulfate heptahydrate provides sufficient magnesium and sulfur elements, which can enhance the photosynthesis and stress resistance of plants, while ensuring the long-term stability of the nutrient solution; DTPA chelated iron exists stably in a weakly alkaline environment, ensuring the efficient supply of iron elements, avoiding the occurrence of chlorosis, and improving the photosynthesis efficiency of crops; boric acid has good solubility in a weakly alkaline environment, providing a stable boron source, promoting the reproductive growth of plants, and improving the fruit setting rate and fruit quality; ammonium molybdate It effectively improves nitrogen utilization, promotes sugar accumulation, and improves fruit sweetness and quality; copper sulfate pentahydrate enhances plant disease resistance, reduces disease occurrence, and promotes normal plant metabolism; zinc sulfate heptahydrate improves plant hormone balance and stress resistance, significantly improving the commercial value of the fruit; manganese sulfate monohydrate ensures efficient utilization of nitrogen and other nutrients by plants, enhances plant stress resistance and photosynthetic capacity; calcium ammonium nitrate can increase fruit hardness and crack resistance, while meeting the nitrogen needs of plant growth; potassium magnesium nitrate dissolves well in a weakly alkaline environment, provides potassium and magnesium elements, and improves fruit quality and plant resistance.

[0051] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, the concentration of each element in the aerosol culture nutrient solution after dilution is:

[0052] Nitrogen (N): 140-160 mg / L, this concentration can meet the rapid growth needs of plants during the seedling and flowering stages, while avoiding the phenomenon of excessive growth caused by excessive nitrogen; Phosphorus (P): 45-50 mg / L, this concentration can promote plant root development and flower bud differentiation, while enhancing stress resistance; Potassium (K): 140-160 mg / L, this concentration can meet the high demand for potassium in the fruiting period of fruit cucumbers, improve the sugar content and quality of the fruit, and enhance the disease resistance and stress resistance of the plants; Calcium (Ca): 60-70 mg / L, this concentration can effectively reduce physiological diseases caused by calcium deficiency; Magnesium (Mg): 35-45 mg / L, this concentration can meet the demand for magnesium in the vigorous growth stage of fruit cucumbers, and significantly improve the efficiency of photosynthesis; Sulfur (S): 60-70 mg / L, this concentration can enhance the nitrogen metabolism and stress resistance of plants; Iron (Fe) : 3.5~4.0mg / L, this concentration can maintain high stability and biological activity in a weakly alkaline environment, and avoid plant chlorosis caused by iron precipitation; Boron (B): 0.7~1.0mg / L, this concentration can significantly improve the fruit setting rate and fruit quality of fruit cucumbers; Zinc (Zn): 0.4~0.6mg / L, this concentration can meet the plant's demand for zinc at different growth stages and improve fruit development; Manganese (Mn): 0.7~1.0mg / L, this concentration can improve the plant's utilization efficiency of nitrogen; Copper (Cu): 0.4~0.6mg / L, this concentration can enhance the plant's disease resistance and reduce the occurrence of diseases caused by high humidity environments; Molybdenum (Mo): 0.04~0.06mg / L, Molybdenum is the active ingredient of nitrate reductase, which can promote the conversion and utilization of nitrogen, especially in the fruiting period, which helps to accumulate sugar in the fruit and improve its quality.

[0053] Please refer to the attached Figure 1 The present invention also provides a process for preparing a nutrient solution for aerosol cultivation of cucumber fruits suitable for weakly alkaline water sources, comprising the following steps:

[0054] S1. Water quality adjustment: Through the water quality adjustment step, the pH value of the weakly alkaline water source can be reduced and the hardness can be stabilized, so as to avoid the precipitation of calcium, magnesium and phosphate or sulfate in the subsequent nutrient solution, and ensure the stability and solubility of the nutrient solution;

[0055] S2. Dissolution of raw materials: by dissolving the order and adjusting the measures, the chemical reaction between the raw materials can be avoided to cause precipitation, thus ensuring the uniformity and solubility of the nutrient solution formula and improving the efficiency of nutrient absorption by crops;

[0056] S3, mother liquor separation and storage, mother liquor separation and storage improves the flexibility of use and long-term stability of the nutrient solution, avoids the precipitation of certain elements in the high-concentration mixed solution, and facilitates subsequent dilution and application;

[0057] S4. Nutrient solution dilution: Ensure that the concentration and pH of the diluted nutrient solution meet the growth needs of plants, meet the requirements of the aeroponic system for nutrient uniformity, and reduce physiological disorders caused by insufficient or excessive nutrition.

[0058] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, water quality adjustment includes:

[0059] Determine the pH value, hardness and total dissolved solids of the water source. Through detailed water quality testing, we can fully understand the basic characteristics of the water source, ensure the accuracy and pertinence of subsequent adjustment measures, and lay the foundation for the stability of the nutrient solution;

[0060] When the pH value is 7.5-8.5, a regulator is added to adjust the pH to 5.5-6.5, wherein:

[0061] When pH>8.0, add 0.5-1.0 mL / L of phosphoric acid;

[0062] When the pH is 7.5-8.0, add 1-2g / L of citric acid as a buffer. By adding regulators in stages and monitoring the pH value in real time, ensure that the pH of the water quality reaches a stable range to avoid precipitation problems caused by excessive or insufficient adjustment. At the same time, by adjusting the hardness, reduce the risk of precipitation formation, and ensure that the calcium and magnesium ions in the water source can normally participate in the element balance in the nutrient solution;

[0063] Circulate and stir the adjusted water for 5 to 10 minutes, and measure again to ensure that the pH value and hardness meet the requirements. Circulate and stir to make the adjusted water source uniform and stable, effectively prevent local precipitation, and ensure the consistency of the nutrient solution in the subsequent preparation process.

[0064] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, the raw material dissolution comprises:

[0065] Add the ingredients in the following order, stirring for 3 to 5 minutes after each ingredient is dissolved:

[0066] The first stage: urea phosphate. The preferential dissolution of urea phosphate not only reduces the pH value of the weakly alkaline water source and avoids the precipitation of calcium and magnesium ions, but also provides nitrogen and phosphorus elements for plant growth, significantly improving the stability of the nutrient solution.

[0067] The second stage: magnesium sulfate heptahydrate, potassium magnesium nitrate, and calcium ammonium nitrate. Magnesium sulfate heptahydrate provides magnesium and sulfur elements, has high compatibility with acidic environments, and is not easy to form precipitation. Potassium magnesium nitrate and calcium ammonium nitrate provide potassium, magnesium, calcium, and nitrogen elements, respectively. These constant elements are the basis for crop growth and should be dissolved in order to avoid reactions between the raw materials.

[0068] The third stage: DTPA chelated iron, boric acid, ammonium molybdate, copper sulfate pentahydrate, zinc sulfate heptahydrate, and manganese sulfate monohydrate. The scientific dissolution order of trace elements ensures the efficient dissolution of all elements, especially the efficient stability of iron and manganese in weakly alkaline water sources, which improves the absorption efficiency of these nutrients by plants;

[0069] Add phosphoric acid or nitric acid to adjust the pH value of the nutrient solution to 5.5-6.5. Phosphoric acid and nitric acid, as acid regulators, can not only accurately adjust the pH value of the nutrient solution, but also play an auxiliary role in the dissolution and stability of the raw materials, avoiding precipitation and reaction. The adjusted nutrient solution is highly matched with the root absorption needs of fruit cucumbers, and effectively avoids the formation of precipitation caused by chemical reactions between the components of the nutrient solution.

[0070] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, the mother liquor separation comprises:

[0071] The dissolved nutrient solution is divided into liquid A, liquid B and liquid C mother solution, the components are:

[0072] Solution A: urea phosphate, magnesium sulfate heptahydrate, magnesium potassium nitrate, dilution ratio of 1:200. By storing the constant elements separately, the potential reaction between urea phosphate and magnesium ions and potassium ions is avoided, ensuring the long-term stability of the solution.

[0073] Liquid B: Calcium ammonium nitrate, the dilution ratio is 1:200. Storing calcium ammonium nitrate alone can prevent calcium ions from reacting with other components (such as phosphates or sulfates) to form precipitation, ensuring efficient use of calcium;

[0074] Solution C: DTPA chelated iron, boric acid, ammonium molybdate, copper sulfate pentahydrate, zinc sulfate heptahydrate, manganese sulfate monohydrate, with a dilution ratio of 1:5000. By storing trace elements separately, especially using DTPA chelating agent to protect iron ions, the risk of precipitation of trace elements during storage and use is avoided, ensuring the stability and effectiveness of the nutrient solution ingredients;

[0075] Store each mother liquor in a sealed container and keep it away from light. Through sealed storage, light protection and regular inspection, the storage period of the mother liquor can be extended and the quality stability of the mother liquor over a long period of time can be guaranteed. Grouped storage can effectively avoid chemical reactions between nutrient solution components, reduce precipitation formation, and significantly improve the storage stability of the mother liquor.

[0076] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, the nutrient solution dilution comprises:

[0077] Dilute the stock solution to the working solution in the following proportions:

[0078] Dilute solution A and solution B to 200 times;

[0079] Solution C was diluted to 5000 times;

[0080] Dilution ratio and operation

[0081] Dilution of Liquid A and Liquid B: Take Liquid A and Liquid B in a ratio of 1:200 (for example, for every 1 liter of mother liquor, add 199 liters of dilution water). Stir for 5 to 10 minutes after adding dilution water each time to ensure uniform mixing.

[0082] Dilution of liquid C: dilute liquid C at a ratio of 1:5000. Liquid C has a low concentration and requires a high-precision metering device to ensure accurate addition. Stir for 10 minutes to ensure uniformity. Through group dilution and uniform mixing, ensure that the composition ratio of the working solution is stable and uniform, effectively avoiding nutrient supply problems caused by uneven mixing.

[0083] The target EC value of the diluted nutrient solution is 1.5-2.5mS / cm, and the target pH value is 5.5-6.5. By precisely adjusting the EC value, the nutrient concentration in the nutrient solution is ensured to be suitable for the absorption needs of fruit cucumbers, while avoiding damage to the root system caused by excessive salt concentration.

[0084] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, 2 to 5 g / L potassium bicarbonate is additionally added to the nutrient solution during the fruiting period to improve the sugar content and quality of the cucumber fruit. By additionally adding potassium bicarbonate, not only the high demand for potassium during the fruiting period is met, but also the photosynthesis efficiency of the plant is improved through carbonate ions, thereby indirectly improving the fruit quality.

[0085] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, the nutrient solution is used for atomization spraying of an aeroponic device, the atomization particle size is controlled at 20 to 50 μm, the spraying frequency is 2 to 4 times per hour, each time lasting 5 to 10 seconds, and the droplet particle size is in the range of 20 to 50 μm, which can evenly cover the surface of the plant root system and form a stable water film, thereby promoting the root system to absorb nutrients in the nutrient solution. The optimization of a single spraying time avoids excessive nutrient solution from being retained in the root zone, reduces the risk of disease, and improves the utilization efficiency of the nutrient solution.

[0086] Please refer to the attached Figure 1In a preferred embodiment of the present invention, the nutrient solution uses a DTPA chelating agent to prevent the precipitation of trace elements in a weakly alkaline environment. In a weakly alkaline water source, DTPA can effectively chelate trace elements such as iron, zinc, and manganese to prevent these ions from forming insoluble precipitates with phosphate or carbonate, thereby maintaining their activity in the nutrient solution; and by adding citric acid or malic acid to form a buffer solution to stabilize the pH value of the nutrient solution, citric acid and malic acid combine with metal ions in the nutrient solution through their polycarboxyl structures to form stable chelates or soluble salts, while releasing hydrogen ions to adjust the pH value of the solution. The addition of the buffer solution not only inhibits the precipitation reaction, but also enhances the adaptability of the nutrient solution to external water quality fluctuations, and enables the nutrient solution to be used for a long time and stably, so that the nutrient solution can continuously provide efficient nutrient supply for crops in a weakly alkaline environment.

[0087] In order to better understand the present invention, the above contents are described in detail below in conjunction with specific embodiments.

[0088] Example 1: Standard nutrient solution suitable for weakly alkaline water sources

[0089] Features:

[0090] Formula: Strictly follow the master formula design, use DTPA chelating agent and citric acid as buffer, and control the pH value at 5.5-6.5.

[0091] Application scenario: Suitable for areas with weakly alkaline water sources with low hardness (pH value between 7.5 and 8.0).

[0092] Implementation method:

[0093] Use macroelements and trace elements to dissolve in groups, and use DTPA chelating agent to avoid trace element precipitation;

[0094] Use 1-1.5 g / L of citric acid to adjust the pH value of the nutrient solution and improve stability;

[0095] During the standard fruiting period, 2 g / L potassium bicarbonate was supplemented.

[0096] Summarize:

[0097] For general weakly alkaline water sources, the standard nutrient solution achieves stable supply during the normal growth stage, demonstrating stability and ease of use.

[0098] Example 2: Fortified nutrient solution suitable for high-hardness weakly alkaline water sources

[0099] Features:

[0100] Formula: Based on the standard formula, the buffer concentration is increased (citric acid is increased to 2g / L) and the DTPA chelating agent ratio is increased (35-40mg / L).

[0101] Application scenario: Suitable for weakly alkaline water sources with higher hardness (pH value between 8.0 and 8.5, hardness ≥ 15 degrees).

[0102] Implementation method:

[0103] Increase the amount of citric acid or malic acid to enhance the buffering capacity of the nutrient solution in high-hardness water sources;

[0104] Appropriately increase the DTPA ratio to enhance the stability of trace elements (iron, zinc, manganese, etc.);

[0105] During the fruiting period, 4g / L potassium bicarbonate was supplemented to meet the high potassium demand of the crop.

[0106] Summarize:

[0107] It can solve the problem of precipitation caused by the reaction of carbonate and phosphate in high-hardness weak-alkaline water sources. It has stronger adaptability and more targetedness.

[0108] Example 3: High potassium nutrient solution suitable for growing high quality fruit cucumbers

[0109] Features:

[0110] Formulation: Maintain the standard ratio of macro- and trace elements, and increase the potassium bicarbonate concentration (to 5g / L) during the fruiting period.

[0111] Application scenario: Specially used for the cultivation of fruit cucumbers with high sugar content and high commercial value.

[0112] Implementation method:

[0113] Add high concentration of potassium bicarbonate during the fruiting period to meet the needs of fruit sugar accumulation and quality improvement;

[0114] Use 1-2 g / L of malic acid to enhance the stability of the nutrient solution and reduce precipitation and pH fluctuations;

[0115] Adjust the spray frequency and time (3 to 4 times per hour, 8 to 10 seconds each time).

[0116] Summarize:

[0117] Emphasis is placed on optimizing fruit quality during the fruiting period. Through high potassium supplementation and a stable pH environment, the sugar content and hardness of the fruit are improved to meet the high value-added market demand.

[0118] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for preparing aerosol nutrient solution for cultivating cucumber fruits in weakly alkaline water sources, characterized in that: Aerosol culture nutrient solution includes the following ingredients: Each liter of water contains: urea phosphate: 200-300 mg; magnesium sulfate heptahydrate: 350-400 mg; DTPA chelated iron: 30-40 mg; boric acid: 4-6 mg; ammonium molybdate: 0.05-0.2 mg; copper sulfate pentahydrate: 1-3 mg; zinc sulfate heptahydrate: 2-3 mg; manganese sulfate monohydrate: 2-3 mg; calcium ammonium nitrate: 300-400 mg; potassium magnesium nitrate: 400-500 mg.

2. The process for preparing the aerosol cultivation nutrient solution for fruit cucumbers suitable for weakly alkaline water sources according to claim 1, characterized in that: The concentration of each element after dilution of the aerosol culture nutrient solution is: Nitrogen (N): 140-160 mg / L; Phosphorus (P): 45-50 mg / L; Potassium (K): 140-160 mg / L; Calcium (Ca): 60-70 mg / L; Magnesium (Mg): 35-45 mg / L; Sulfur (S): 60-70 mg / L; Iron (Fe): 3.5-4.0 mg / L; Boron (B): 0.7-1.0 mg / L; Zinc (Zn): 0.4-0.6 mg / L; Manganese (Mn): 0.7-1.0 mg / L; Copper (Cu): 0.4-0.6 mg / L; Molybdenum (Mo): 0.04-0.06 mg / L.

3. A process for preparing aerosol nutrient solution for cucumber fruit cultivation suitable for weakly alkaline water sources, characterized in that: The method of using the aerosol nutrient solution for cultivating cucumber fruits in weakly alkaline water sources as described in any one of items 1 to 2 comprises the following steps: S1. Water quality regulation; S2, raw material dissolution; S3, mother liquor separation and storage; S4. Dilution of nutrient solution.

4. The aerosol culture nutrient solution for fruit cucumbers suitable for weakly alkaline water sources and the preparation process according to claim 1, characterized in that: The water quality adjustment includes: Determine the pH, hardness and total dissolved solids of water sources; When the pH value is 7.5-8.5, a regulator is added to adjust the pH to 5.5-6.5, wherein: When pH>8.0, add 0.5-1.0 mL / L of phosphoric acid; When the pH is 7.5-8.0, add 1-2 g / L of citric acid as a buffer; Circulate and stir the adjusted water for 5 to 10 minutes and measure again to ensure that the pH and hardness meet the requirements.

5. The aerosol culture nutrient solution for fruit cucumbers suitable for weakly alkaline water sources and the preparation process according to claim 1, characterized in that: The raw material dissolution comprises: Add the ingredients in the following order, stirring for 3 to 5 minutes after each ingredient is dissolved: Phase 1: Urea phosphate; Stage 2: magnesium sulfate heptahydrate, magnesium potassium nitrate, calcium ammonium nitrate; Phase III: DTPA chelated iron, boric acid, ammonium molybdate, copper sulfate pentahydrate, zinc sulfate heptahydrate, manganese sulfate monohydrate; Add phosphoric acid or nitric acid to adjust the pH of the nutrient solution to 5.5-6.

5.

6. The aerosol culture nutrient solution for fruit cucumbers suitable for weakly alkaline water sources and the preparation process according to claim 1, characterized in that: The mother liquor separation comprises: The dissolved nutrient solution is divided into liquid A, liquid B and liquid C mother solution, the components are: Solution A: urea phosphate, magnesium sulfate heptahydrate, magnesium potassium nitrate, dilution ratio is 1:200; Solution B: calcium ammonium nitrate, dilution ratio 1:200; Solution C: DTPA chelated iron, boric acid, ammonium molybdate, copper sulfate pentahydrate, zinc sulfate heptahydrate, manganese sulfate monohydrate, dilution ratio is 1:5000; Store each stock solution in a sealed container and protect from light.

7. The aerosol culture nutrient solution for fruit cucumbers suitable for weakly alkaline water sources and the preparation process according to claim 1, characterized in that: The nutrient solution dilution comprises: Dilute the stock solution to the working solution in the following proportions: Dilute solution A and solution B to 200 times; Solution C was diluted to 5000 times; The target EC value of the diluted nutrient solution is 1.5-2.5 mS / cm, and the target pH value is 5.5-6.

5.

8. The aerosol culture nutrient solution for fruit cucumbers suitable for weakly alkaline water sources and the preparation process according to claim 1, characterized in that: Add an additional 2 to 5 g / L of potassium bicarbonate to the nutrient solution during the fruiting period to increase the sugar content and quality of the cucumber fruit.

9. The aerosol culture nutrient solution for fruit cucumbers suitable for weakly alkaline water sources and the preparation process according to claim 1, characterized in that: The nutrient solution is used for atomization spraying of an aeroponic device, the atomization particle size is controlled at 20 to 50 μm, the spraying frequency is 2 to 4 times per hour, and each time lasts for 5 to 10 seconds.

10. The aerosol culture nutrient solution for fruit cucumbers suitable for weakly alkaline water sources and the preparation process according to claim 1, characterized in that: The nutrient solution uses a DTPA chelating agent to prevent the precipitation of trace elements in a weakly alkaline environment, and forms a buffer by adding citric acid or malic acid to stabilize the pH value of the nutrient solution.

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