Nutrient solution for hydroponic plants and method for preparing the same

Abstract

The present application relates to the technical field of nutrient solution, in particular to a nutrient solution suitable for hydroponic plants and a preparation method thereof, which comprises the following raw materials by weight: 40-60 parts of composite nutrient agent, 10-20 parts of additive, 10-20 parts of biogas slurry, and 10-20 parts of powder material.In the present application, the additive is added during the preparation of the nutrient solution, wherein the cinnamon powder utilizes the cinnamyl aldehyde component therein, the cinnamyl aldehyde has good broad-spectrum bacteriostatic performance and good inhibitory effect on common root rot fungi in hydroponic plants, the chitosan can combine with bacterial cell membranes by utilizing its positive charge to destroy the osmotic pressure balance, the addition of citric acid can enhance the solubility of chitosan and play a synergistic role in inhibiting bacterial growth, block the infection of root rot fungi, promote the colonization of beneficial microorganisms in the root system of hydroponic plants, avoid the occurrence of root rot in the root system of hydroponic plants, and effectively improve the growth stability of hydroponic plants.

Description

Technical Field

[0001] This invention relates to the field of nutrient solution technology, specifically to a nutrient solution suitable for hydroponic plants and its preparation method. Background Technology

[0002] Hydroponic plant nutrient solution is a water-soluble fertilizer specially designed for hydroponic plants. Through scientific formulation of various nutrient elements, it provides the necessary nutrients for plant growth, replacing the nutrient supply in traditional soil.

[0003] In existing technologies, the addition of nutrient solution to the water used for hydroponic plant cultivation can lead to nutrient overload, which in turn causes the rapid proliferation of harmful fungi. This results in root rot due to fungal infection, affecting the stability of hydroponic plant growth. Therefore, this invention provides a nutrient solution suitable for hydroponic plants and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a nutrient solution suitable for hydroponic plants and its preparation method. The nutrient solution prepared by this invention not only has good antibacterial properties, but also excellent germination rate, effectively improving the performance of the nutrient solution.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a nutrient solution suitable for hydroponic plants, comprising the following raw materials in parts by weight: 40-60 parts of compound nutrient agent, 10-20 parts of additive, 10-20 parts of biogas slurry, and 10-20 parts of powder.

[0007] The preparation of the additive includes the following steps:

[0008] (1) Extraction process: Coix seed, camellia seed cake and cinnamon powder are used as base materials and extracted to obtain a mixture. Coix seed and camellia seed cake are pretreated before extraction. The mass ratio of coix seed, camellia seed cake and cinnamon powder is 1:(2~3):(0.6~0.8).

[0009] (2) Preparation of the mixture: The mixture is used to mix the materials. The mass ratio of the materials to the mixture is 1:(0.2~0.4).

[0010] (3) Mixing treatment: The mixture and the liquid are mixed to obtain the additive.

[0011] Furthermore, the pretreatment method for Job's tears is as follows: rinse Job's tears with clean water, then sun-dry them, stir-fry the rinsed and dried Job's tears in an iron pot over low heat for 10-15 minutes, then cool them quickly with a fan, pulverize the resulting product, and sieve it through a 100-200 mesh screen to complete the pretreatment of Job's tears.

[0012] Further, the pretreatment method for the camellia oil cake meal is as follows: rinsing the camellia oil cake meal with clean water, then sun-drying it, disinfecting the rinsed and dried camellia oil cake meal with ultraviolet lamp, immersing the disinfected camellia oil cake meal in warm water at a temperature of 50-60℃ for 20-40 minutes, then immersing it in citric acid solution at 40-50℃ for 2-4 hours, then rinsing it with deionized water, and sending the resulting product into an oven at 45-55℃ for 4-6 hours, then pulverizing it and sieving it through a 100-200 mesh sieve to complete the pretreatment of the camellia oil cake meal.

[0013] Furthermore, the citric acid solution has a mass concentration of 1–2%.

[0014] Further, the extraction method is as follows: cinnamon powder, pretreated coix seed, and camellia seed cake are added to a water bath. A 70-80% ethanol aqueous solution is added to the reaction vessel, with a material-to-liquid ratio of 1:(8-10). The temperature is set to 70-80℃, and the water bath extraction is carried out for 2-3 hours. Then, alum is added, and after mixing, the resulting product is added to a centrifuge. The centrifuge is set to 6000-8000 r / min, and centrifuged for 6-10 minutes. After centrifugation, the supernatant is obtained, and the supernatant is concentrated and dried. The process involves preparing a coarse material, which is then added to a container along with an 80-90% ethanol-water solution. Acetone is added to the container, with a mass ratio of coarse material to ethanol-water solution of 1:(2-4). The mass of acetone is equal to the mass of the ethanol-water solution. The mixture is allowed to stand for 8-10 hours, followed by centrifugation at 6000-8000 rpm for 6-10 minutes. The resulting precipitate is then placed in an oven at 50-60°C and dried for 4-6 hours to complete the extraction process and obtain a mixed material.

[0015] Further, the mixture is prepared by the following method: chitosan and citric acid solution are mixed and then subjected to ultrasonic treatment at a temperature of 50–55°C for 20–30 min. After treatment, the pH is adjusted to 5–6. The resulting product is added to a water bath containing galactomannan and lecithin. The water bath is set to a temperature of 50–60°C, and a magnetic stirrer is connected at 120–160 r / min. The mixture is stirred at a constant temperature for 10–20 min. The resulting product is then added to a reaction vessel. Add phycocyanin to the reactor. Set the reactor speed to 80-100 r / min. When stirring begins, set the heating rate to 2-4℃ / min. After heating to 50℃, maintain the temperature and stir for 6-10 min to obtain a mixture. The mixture contains 1-2% citric acid solution, a chitosan to citric acid solution mass ratio of 1:(6-8), 1-3% galactomannan (of chitosan mass), 0.8-1% lecithin (of chitosan mass), and 1-3% phycocyanin (of chitosan mass).

[0016] Furthermore, the mixing process is as follows: the mixture and the liquid mixture are added to a mixer, the mixer is set to 80-100 r / min and stirred for 10-20 min, and then left to stand for 6-8 h to obtain the additive.

[0017] Further, the powder is prepared by the following method: sugarcane bagasse, rice husks, and corn cobs are ground into powder with a particle size of 40–60 μm to obtain a mixed powder. The mixed powder, water, cellulase, and xylanase are added to a mixer, which is set to 300–400 r / min and stirred for 8–12 min. The pH of the resulting mixture is adjusted to 4.5–5.5, and the mixture is allowed to stand at 48–50°C for 4–6 h. The resulting product is added to a centrifuge, which is set to 3000–4000 r / min and centrifuged for 6–10 min to obtain a precipitate. The sediment, precipitate, diatomaceous earth, and humic acid are added to a mixer. The mixer is set to 500-600 r / min and stirred for 20-30 min. The resulting product is dried to obtain powder. The mass ratio of bagasse, rice husk, and corn cob is 1:(2-4):(2-4), and the mass ratio of mixed powder, water, cellulase, and xylanase is 1:(2-4):(0.01-0.03):(0.01-0.03). The mass of diatomaceous earth is 8-12% of the mass of the mixed powder, and the mass of humic acid is 2-4% of the mass of the mixed powder.

[0018] Furthermore, the compound nutrient is composed of the following raw materials by weight percentage: 6-8% urea, 4-6% zinc sulfate, 4-6% magnesium sulfate, 4-6% manganese sulfate, 2-4% potassium dihydrogen phosphate, 2-4% calcium nitrate, 2-4% ammonium nitrate, 0.8-1% asparagine, 0.6-0.8% vitamin C, and 0.6-0.8% vitamin B, with the remainder supplemented to 100% by deionized water.

[0019] Secondly, the present invention also provides a method for preparing a nutrient solution suitable for hydroponic plants, comprising the following steps: weighing out compound nutrients, additives, biogas slurry and powder as needed and adding them to a mixer, setting the mixer to 600-800 r / min and stirring for 20-30 min to obtain a nutrient solution suitable for hydroponic plants.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. In this invention, by adding additives during the preparation of the nutrient solution, cinnamon powder utilizes its cinnamaldehyde component, which has good broad-spectrum antibacterial properties and a good inhibitory effect on common root-rot fungi in hydroponic plants. Chitosan, with its positive charge, can bind to bacterial cell membranes and disrupt osmotic pressure balance. The addition of citric acid can enhance the solubility of chitosan and play a synergistic role in inhibiting bacterial growth, blocking the infection of root-rot fungi, and promoting the colonization of beneficial microorganisms in the roots of hydroponic plants, thus preventing root rot and effectively improving the growth stability of hydroponic plants.

[0022] 2. In this invention, through the pretreatment of coix seed and camellia seed cake, the cell walls of coix seed can be destroyed after stir-frying and crushing, so as to release coixenolide. The surface microorganisms of camellia seed cake can be inactivated after ultraviolet disinfection. Soaking in citric acid can dissolve the saponins in camellia seed cake. Tea saponins have a good inhibitory effect on fungi, further improving the antibacterial properties of the nutrient solution.

[0023] 3. In this invention, by adding powder during the preparation of nutrient solution, rice husks and corn cobs, after being ground and enzymatically hydrolyzed, can generate soluble sugars, providing energy for the early germination of seeds. The high porosity of diatomaceous earth increases oxygen diffusion efficiency and enhances seed activity under soaking conditions. Humic acid can stimulate the production of endogenous hormones in seeds, break dormancy, shorten seed germination time, and thus effectively improve the germination rate of hydroponic plant seeds. Attached Figure Description

[0024] Figure 1 A flowchart is provided for an invention that proposes a nutrient solution suitable for hydroponic plants and a method for its preparation. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that the raw materials used in the following embodiments are all commercially available.

[0027] Example 1: Includes the following raw materials by weight: 40 parts compound nutrient, 10 parts additive, 10 parts biogas slurry, and 10 parts powder.

[0028] The preparation of the additive includes the following steps:

[0029] The extraction process involves using Job's tears, camellia oil cake, and cinnamon powder as base materials to extract a mixture. Job's tears and camellia oil cake are pretreated separately before extraction. The mass ratio of Job's tears, camellia oil cake, and cinnamon powder is 1:2:0.6.

[0030] The pretreatment method for Job's tears is as follows: Rinse Job's tears with clean water, then dry them in the sun. After rinsing and drying, stir-fry the Job's tears in an iron pot over low heat for 10 minutes, then cool them quickly with a fan. The resulting product is then pulverized and sieved through a 100-mesh sieve to complete the pretreatment of Job's tears.

[0031] The pretreatment method for camellia oil cake meal is as follows: Rinse the camellia oil cake meal with clean water, then sun-dry it. Sterilize the rinsed and dried camellia oil cake meal with ultraviolet lamp. After sterilization, immerse the camellia oil cake meal in warm water at 50℃ for 20 minutes. After soaking, immerse it in citric acid solution and let it stand at 40℃ for 2 hours. Then rinse it with deionized water. The resulting product is sent to an oven and dried at 45℃ for 4 hours. After drying, it is crushed and sieved through a 100-mesh sieve to complete the pretreatment of camellia oil cake meal. The mass concentration of citric acid solution is 1%.

[0032] The extraction process is as follows: Cinnamon powder, pretreated Job's tears, and camellia seed cake are added to a water bath. A 70% ethanol aqueous solution is added to the reaction vessel, with a material-to-liquid ratio of 1:8. The temperature is set at 70℃, and the water bath extraction is carried out for 2 hours. Then, alum is added, and the mixture is stirred. The resulting product is then added to a centrifuge, which is set to 6000 r / min and centrifuged for 6 minutes. The supernatant is obtained after centrifugation and is concentrated and dried to obtain a crude material. The crude material and an 80% ethanol aqueous solution are added to a container, and acetone is added to the container. The mass ratio of the crude material to the ethanol aqueous solution is 1:2, and the mass of acetone is equal to the mass of the ethanol aqueous solution. The mixture is allowed to stand for 8 hours, and then centrifuged at 6000 r / min for 6 minutes. The precipitate is obtained after centrifugation and is sent to an oven, which is set to 50℃ and dried for 4 hours to complete the extraction process and obtain a mixed material.

[0033] Preparation of the mixture, which is used to mix the mixture, wherein the mass ratio of the mixture to the mixture is 1:0.2;

[0034] The mixture was prepared by the following method: chitosan and citric acid solution were mixed and then subjected to ultrasonic treatment at a temperature of 50°C for 20 minutes. After treatment, the pH was adjusted to 5. The resulting product was added to a water bath, where galactomannan and lecithin were added. The water bath was set to 50°C, and a magnetic stirrer was connected at 120 rpm. The mixture was stirred at a constant temperature for 10 minutes. The resulting product was then added to a reaction vessel, where alginate was added. The reaction vessel was set to a rotation speed of 80 rpm. The initial heating rate was 2°C / min. After heating to 50°C, the mixture was stirred at a constant temperature for 6 minutes to obtain the mixture. The citric acid solution had a mass concentration of 1%, the chitosan to citric acid solution mass ratio was 1:6, the galactomannan mass was 1% of the chitosan mass, the lecithin mass was 0.8% of the chitosan mass, and the alginate mass was 1% of the chitosan mass.

[0035] The mixing process involves mixing the raw material with the liquid mixture to obtain the additive.

[0036] The mixing process is as follows: the mixture and the liquid are added to a mixer, the mixer is set to 80 r / min and stirred for 10 min, and then left to stand for 6 h to obtain the additive;

[0037] The powder was prepared by the following method: sugarcane bagasse, rice husks, and corn cobs were ground to a particle size of 40 μm to obtain a mixed powder. The mixed powder, water, cellulase, and xylanase were added to a mixer and stirred at 300 r / min for 8 min. The pH of the resulting mixture was adjusted to 4.5 and allowed to stand at 48℃ for 4 h. The resulting product was added to a centrifuge and centrifuged at 3000 r / min for 6 min to obtain a precipitate. The precipitate, diatomaceous earth, and humic acid were added to a mixer and stirred at 500 r / min for 20 min. The resulting product was dried to obtain the powder. The mass ratio of sugarcane bagasse, rice husks, and corn cobs was 1:2:2, the mass ratio of the mixed powder, water, cellulase, and xylanase was 1:2:0.01:0.01, the mass of diatomaceous earth was 8% of the mass of the mixed powder, and the mass of humic acid was 2% of the mass of the mixed powder.

[0038] The compound nutrient is composed of the following ingredients by weight percentage: 6% urea, 4% zinc sulfate, 4% magnesium sulfate, 4% manganese sulfate, 2% potassium dihydrogen phosphate, 2% calcium nitrate, 2% ammonium nitrate, 0.8% asparagine, 0.6% vitamin C, 0.6% vitamin B, with the remainder supplemented to 100% by deionized water.

[0039] A method for preparing a nutrient solution suitable for hydroponic plants includes the following steps: weigh out the compound nutrient, additives, biogas slurry and powder as needed and add them to a mixer. Set the mixer to 600 r / min and stir for 20 min to obtain a nutrient solution suitable for hydroponic plants.

[0040] Example 2: Includes the following raw materials by weight: 50 parts compound nutrient, 15 parts additive, 15 parts biogas slurry, and 15 parts powder.

[0041] The preparation of the additive includes the following steps:

[0042] The extraction process involves using Job's tears, camellia oil cake residue, and cinnamon powder as base materials to extract a mixture. Job's tears and camellia oil cake residue are pretreated separately before extraction. The mass ratio of Job's tears, camellia oil cake residue, and cinnamon powder is 1:2.5:0.7.

[0043] The pretreatment method for Job's tears is as follows: Rinse Job's tears with clean water, then dry them in the sun. After rinsing and drying, stir-fry the Job's tears in an iron pot over low heat for 12 minutes, then cool them quickly with a fan. The resulting product is then pulverized and sieved through a 150-mesh sieve to complete the pretreatment of Job's tears.

[0044] The pretreatment method for camellia oil cake meal is as follows: Rinse the camellia oil cake meal with clean water, then sun-dry it. Disinfect the rinsed and dried camellia oil cake meal with ultraviolet lamp. After disinfection, immerse the camellia oil cake meal in warm water at 55℃ for 30 minutes. After soaking, immerse it in citric acid solution and let it stand at 45℃ for 3 hours. Then rinse it with deionized water. The resulting product is sent to an oven and dried at 50℃ for 5 hours. After drying, it is crushed and sieved through a 150-mesh sieve to complete the pretreatment of camellia oil cake meal. The mass concentration of citric acid solution is 1.5%.

[0045] The extraction process is as follows: Cinnamon powder, pretreated Job's tears, and camellia seed cake are added to a water bath. A 75% ethanol aqueous solution is added to the reaction vessel, with a material-to-liquid ratio of 1:9. The temperature is set at 75℃, and the water bath extraction is carried out for 2.5 hours. Then, alum is added, and the mixture is stirred. The resulting product is then added to a centrifuge, which is set to 7000 r / min and centrifuged for 80 minutes. The supernatant is obtained after centrifugation and is concentrated and dried to obtain a crude material. The crude material and the 85% ethanol aqueous solution are added to a container, and acetone is added to the container. The mass ratio of the crude material to the ethanol aqueous solution is 1:3, and the mass of acetone is equal to the mass of the ethanol aqueous solution. The mixture is allowed to stand for 9 hours, and then centrifuged at 7000 r / min for 8 minutes. The precipitate is obtained after centrifugation and sent to an oven, which is set to 55℃ and dried for 5 hours to complete the extraction process and obtain a mixed material.

[0046] Preparation of the mixture, which is used to mix the mixture, wherein the mass ratio of the mixture to the mixture is 1:0.3;

[0047] The mixture was prepared by the following method: chitosan and citric acid solution were mixed and then ultrasonically treated at a temperature of 52℃ for 25 minutes. After treatment, the pH was adjusted to 5.5. The resulting product was added to a water bath containing galactomannan and lecithin. The water bath was set to 55℃, and a magnetic stirrer was connected at 140 rpm. The mixture was stirred at this constant temperature for 15 minutes. The resulting product was then added to a reaction vessel containing phycocyanin. The reaction vessel was set to rotate at 90 rpm. The initial heating rate was 3℃ / min. After heating to 50℃, the mixture was stirred at this constant temperature for 8 minutes to obtain the final mixture. The citric acid solution had a mass concentration of 1.5%, the chitosan to citric acid solution mass ratio was 1:7, the galactomannan mass was 2% of the chitosan mass, the lecithin mass was 0.9% of the chitosan mass, and the phycocyanin mass was 2% of the chitosan mass.

[0048] The mixing process involves mixing the raw material with the liquid mixture to obtain the additive.

[0049] The mixing process is as follows: the mixture and the liquid are added to a mixer, the mixer is set to 90 r / min and stirred for 15 min, and then left to stand for 7 h to obtain the additive;

[0050] The powder was prepared by the following method: sugarcane bagasse, rice husks, and corn cobs were ground to a particle size of 50 μm to obtain a mixed powder. The mixed powder, water, cellulase, and xylanase were added to a mixer and stirred at 350 r / min for 10 min. The pH of the resulting mixture was adjusted to 5 and allowed to stand at 49℃ for 5 h. The resulting product was added to a centrifuge and centrifuged at 3500 r / min for 8 min to obtain a precipitate. The precipitate, diatomaceous earth, and humic acid were added to a mixer and stirred at 550 r / min for 25 min. The resulting product was dried to obtain the powder. The mass ratio of sugarcane bagasse, rice husks, and corn cobs was 1:3:3, the mass ratio of the mixed powder, water, cellulase, and xylanase was 1:3:0.02:0.02, the mass of diatomaceous earth was 10% of the mass of the mixed powder, and the mass of humic acid was 3% of the mass of the mixed powder.

[0051] The compound nutrient is composed of the following ingredients by weight percentage: 7% urea, 5% zinc sulfate, 5% magnesium sulfate, 5% manganese sulfate, 3% potassium dihydrogen phosphate, 3% calcium nitrate, 3% ammonium nitrate, 0.9% asparagine, 0.7% vitamin C, 0.7% vitamin B, with the remainder supplemented to 100% by deionized water;

[0052] A method for preparing a nutrient solution suitable for hydroponic plants includes the following steps: weigh out the compound nutrient, additives, biogas slurry and powder as needed and add them to a mixer. Set the mixer to 700 r / min and stir for 25 min to obtain a nutrient solution suitable for hydroponic plants.

[0053] Example 3: Includes the following raw materials by weight: 40 parts compound nutrient, 10 parts additive, 10 parts biogas slurry, and 10 parts powder;

[0054] The preparation of the additive includes the following steps:

[0055] The extraction process involves using Job's tears, camellia oil cake, and cinnamon powder as base materials to extract a mixture. Job's tears and camellia oil cake are pretreated separately before extraction. The mass ratio of Job's tears, camellia oil cake, and cinnamon powder is 1:2:0.6.

[0056] The pretreatment method for Job's tears is as follows: Rinse Job's tears with clean water, then dry them in the sun. After rinsing and drying, stir-fry the Job's tears in an iron pot over low heat for 10 minutes, then cool them quickly with a fan. The resulting product is then pulverized and sieved through a 100-mesh sieve to complete the pretreatment of Job's tears.

[0057] The pretreatment method for camellia oil cake meal is as follows: Rinse the camellia oil cake meal with clean water, then sun-dry it. Sterilize the rinsed and dried camellia oil cake meal with ultraviolet lamp. After sterilization, immerse the camellia oil cake meal in warm water at 50℃ for 20 minutes. After soaking, immerse it in citric acid solution and let it stand at 40℃ for 2 hours. Then rinse it with deionized water. The resulting product is sent to an oven and dried at 45℃ for 4 hours. After drying, it is crushed and sieved through a 100-mesh sieve to complete the pretreatment of camellia oil cake meal. The mass concentration of citric acid solution is 1%.

[0058] The extraction process is as follows: Cinnamon powder, pretreated Job's tears, and camellia seed cake are added to a water bath. A 70% ethanol aqueous solution is added to the reaction vessel, with a material-to-liquid ratio of 1:8. The temperature is set at 70℃, and the water bath extraction is carried out for 2 hours. Then, alum is added, and the mixture is stirred. The resulting product is then added to a centrifuge, which is set to 6000 r / min and centrifuged for 6 minutes. The supernatant is obtained after centrifugation and is concentrated and dried to obtain a crude material. The crude material and an 80% ethanol aqueous solution are added to a container, and acetone is added to the container. The mass ratio of the crude material to the ethanol aqueous solution is 1:2, and the mass of acetone is equal to the mass of the ethanol aqueous solution. The mixture is allowed to stand for 8 hours, and then centrifuged at 6000 r / min for 6 minutes. The precipitate is obtained after centrifugation and is sent to an oven, which is set to 50℃ and dried for 4 hours to complete the extraction process and obtain a mixed material.

[0059] Preparation of the mixture, which is used to mix the mixture, wherein the mass ratio of the mixture to the mixture is 1:0.2;

[0060] The mixture was prepared by the following method: chitosan and citric acid solution were mixed and then subjected to ultrasonic treatment at a temperature of 50°C for 20 minutes. After treatment, the pH was adjusted to 5. The resulting product was added to a water bath, where galactomannan and lecithin were added. The water bath was set to 50°C, and a magnetic stirrer was connected at 120 rpm. The mixture was stirred at a constant temperature for 10 minutes. The resulting product was then added to a reaction vessel, where alginate was added. The reaction vessel was set to a rotation speed of 80 rpm. The initial heating rate was 2°C / min. After heating to 50°C, the mixture was stirred at a constant temperature for 6 minutes to obtain the mixture. The citric acid solution had a mass concentration of 1%, the chitosan to citric acid solution mass ratio was 1:6, the galactomannan mass was 1% of the chitosan mass, the lecithin mass was 0.8% of the chitosan mass, and the alginate mass was 1% of the chitosan mass.

[0061] The mixing process involves mixing the raw material with the liquid mixture to obtain the additive.

[0062] The mixing process is as follows: the mixture and the liquid are added to a mixer, the mixer is set to 80 r / min and stirred for 10 min, and then left to stand for 6 h to obtain the additive;

[0063] The powder was prepared by the following method: sugarcane bagasse, rice husks, and corn cobs were ground to a particle size of 40 μm to obtain a mixed powder. The mixed powder, water, cellulase, and xylanase were added to a mixer and stirred at 300 r / min for 8 min. The pH of the resulting mixture was adjusted to 4.5 and allowed to stand at 48℃ for 4 h. The resulting product was added to a centrifuge and centrifuged at 3000 r / min for 6 min to obtain a precipitate. The precipitate, diatomaceous earth, and humic acid were added to a mixer and stirred at 500 r / min for 20 min. The resulting product was dried to obtain the powder. The mass ratio of sugarcane bagasse, rice husks, and corn cobs was 1:2:2, the mass ratio of the mixed powder, water, cellulase, and xylanase was 1:2:0.01:0.01, the mass of diatomaceous earth was 8% of the mass of the mixed powder, and the mass of humic acid was 2% of the mass of the mixed powder.

[0064] The compound nutrient is composed of the following ingredients by weight percentage: 6% urea, 4% zinc sulfate, 4% magnesium sulfate, 4% manganese sulfate, 2% potassium dihydrogen phosphate, 2% calcium nitrate, 2% ammonium nitrate, 0.8% asparagine, 0.6% vitamin C, 0.6% vitamin B, with the remainder supplemented to 100% by deionized water;

[0065] A method for preparing a nutrient solution suitable for hydroponic plants includes the following steps: weigh out the compound nutrient, additives, biogas slurry and powder as needed and add them to a mixer. Set the mixer to 600 r / min and stir for 20 min to obtain a nutrient solution suitable for hydroponic plants.

[0066] Comparative Example 1: The difference between this comparative example and Example 1 is that an equal amount of rice husk powder is used to replace the powder in this comparative example.

[0067] Comparative Example 2: The difference between this comparative example and Example 1 is that this comparative example does not contain powder.

[0068] Comparative Example 3 differs from Example 1 in that an equal amount of camellia seed cake powder extractant is used in this comparative example.

[0069] Comparative Example 4 differs from Example 1 in that it does not contain any additives.

[0070] Performance testing: The nutrient solutions prepared in Examples 1, 2, 3, 1, 2, 3, and 4 were subjected to performance testing. The test data are recorded in the table below:

[0071]

[0072] In the performance test, the method for testing the antibacterial rate was as follows: the nutrient solutions prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were added to the culture medium respectively. 5 mm mycelial blocks of Pythium and Phytophthora were inoculated into the culture medium. The diameter of the mycelial blocks was measured 24 h and 72 h after inoculation, and the antibacterial rate was calculated.

[0073] The germination rate was tested as follows: the nutrient solutions prepared in Examples 1, 2, 3, 1, 2, 3 and 4 were diluted with 6 times the amount of water. The tomato seeds were soaked in the diluted nutrient solution for 10 hours, and the germination rate was calculated 72 hours after sowing.

[0074] It is evident that the antibacterial properties and germination rates of the nutrient solutions prepared in Comparative Examples 1, 2, 3, and 4 are all lower than those in Examples 1, 2, and 3.

[0075] By comparing and analyzing the relevant data in the table, it can be seen that the nutrient solution prepared by this invention not only has good antibacterial properties but also excellent germination rate. This indicates that the nutrient solution for hydroponic plants provided by this invention has a broader market prospect and is more suitable for widespread application.

[0076] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0077] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A nutrient solution suitable for hydroponic plants, characterized in that: It includes the following raw materials by weight: 40-60 parts compound nutrient, 10-20 parts additive, 10-20 parts biogas slurry, and 10-20 parts powder. The preparation of the additive includes the following steps: (1) Extraction process: Coix seed, camellia seed cake and cinnamon powder are used as base materials for extraction process to obtain a mixture. Coix seed and camellia seed cake are pretreated separately before extraction process. The mass ratio of coix seed, camellia seed cake and cinnamon powder is 1:(2~3):(0.6~0.8). The extraction method is as follows: cinnamon powder, pretreated Job's tears, and camellia seed cake are added to a water bath. A 70-80% ethanol aqueous solution is added to the reaction vessel, with a material-to-liquid ratio of 1:(8-10). The temperature is set to 70-80℃, and the water bath extraction is carried out for 2-3 hours. Then, alum is added, and after mixing, the resulting product is added to a centrifuge. The centrifuge is set to 6000-8000 r / min and centrifuged for 6-10 minutes. The supernatant is obtained after centrifugation and then concentrated and dried. The crude material is prepared and added to a container with an 80-90% ethanol aqueous solution. Acetone is added to the container, and the mass ratio of crude material to ethanol aqueous solution is 1:(2-4). The mass of acetone is equal to the mass of ethanol aqueous solution. The mixture is allowed to stand for 8-10 hours, and then centrifuged at 6000-8000 r / min for 6-10 minutes. The precipitate is obtained after centrifugation and sent to an oven at 50-60℃ for 4-6 hours to dry. The extraction process is completed, and a mixture is obtained. The pretreatment method for Job's tears is as follows: rinse Job's tears with clean water, then sun-dry them, stir-fry the rinsed and dried Job's tears in an iron pot over low heat for 10-15 minutes, then cool them quickly with a fan, and then pulverize the resulting product and sieve it through a 100-200 mesh screen to complete the pretreatment of Job's tears. The pretreatment method for camellia oil cake is as follows: rinsing the camellia oil cake with clean water, then sun-drying it, disinfecting the rinsed and dried camellia oil cake with ultraviolet light, immersing the disinfected camellia oil cake in warm water at a temperature of 50-60℃ for 20-40 minutes, then immersing it in citric acid solution at 40-50℃ for 2-4 hours, then rinsing it with deionized water, and finally sending the product into an oven at 45-55℃ for 4-6 hours. After drying, the product is pulverized and sieved through a 100-200 mesh sieve, thus completing the pretreatment of the camellia oil cake. (2) Preparation of the mixture: The mixture is used to mix the materials. The mass ratio of the materials to the mixture is 1:(0.2~0.4). The mixture was prepared by the following method: chitosan and citric acid solution were mixed and then subjected to ultrasonic treatment at a temperature of 50–55°C for 20–30 minutes. After treatment, the pH was adjusted to 5–6. The resulting product was added to a water bath containing galactomannan and lecithin. The water bath was set to a temperature of 50–60°C, and a magnetic stirrer was connected at 120–160 rpm for 10–20 minutes. The resulting product was then added to a reaction vessel and subjected to further processing. Add phycocyanin to the reactor, set the reactor speed to 80-100 r / min, set the heating rate to 2-4℃ / min when stirring begins, and after heating to 50℃, maintain the temperature and stir for 6-10 min to obtain a mixture. The mixture contains 1-2% citric acid solution, a chitosan to citric acid solution mass ratio of 1:(6-8), 1-3% galactomannan by mass of chitosan, 0.8-1% lecithin by mass of chitosan, and 1-3% phycocyanin by mass of chitosan. (3) Mixing treatment: The mixture and the liquid are mixed to obtain the additive.

2. The nutrient solution for hydroponic plants according to claim 1, characterized in that, The mass concentration of the citric acid solution is 1-2%.

3. The nutrient solution for hydroponic plants according to claim 1, characterized in that, The mixing process is as follows: the mixture and the liquid are added to a mixer, the mixer is set to 80-100 r / min and stirred for 10-20 min, and then left to stand for 6-8 h to obtain the additive.

4. The nutrient solution for hydroponic plants according to claim 1, characterized in that, The powder is prepared by the following method: sugarcane bagasse, rice husks, and corn cobs are ground into powder with a particle size of 40–60 μm to obtain a mixed powder. The mixed powder, water, cellulase, and xylanase are added to a mixer and stirred at 300–400 rpm for 8–12 min. The pH of the resulting mixture is adjusted to 4.5–5.5, and the mixture is allowed to stand at 48–50°C for 4–6 h. The resulting product is then added to a centrifuge and centrifuged at 3000–4000 rpm for 6–10 min to obtain a precipitate. The precipitate, diatomaceous earth, and humic acid are added to a mixer, which is set to 500-600 r / min and stirred for 20-30 min. The resulting product is dried to obtain powder. The mass ratio of bagasse, rice husk, and corn cob is 1:(2-4):(2-4), and the mass ratio of mixed powder, water, cellulase, and xylanase is 1:(2-4):(0.01-0.03):(0.01-0.03). The mass of diatomaceous earth is 8-12% of the mass of the mixed powder, and the mass of humic acid is 2-4% of the mass of the mixed powder.

5. The nutrient solution for hydroponic plants according to claim 1, characterized in that, The compound nutrient solution is composed of the following raw materials by weight percentage: 6-8% urea, 4-6% zinc sulfate, 4-6% magnesium sulfate, 4-6% manganese sulfate, 2-4% potassium dihydrogen phosphate, 2-4% calcium nitrate, 2-4% ammonium nitrate, 0.8-1% asparagine, 0.6-0.8% vitamin C, and 0.6-0.8% vitamin B, with the remainder supplemented by deionized water to bring the total to 100%.

6. A method for preparing a nutrient solution suitable for hydroponic plants according to any one of claims 1 to 5, characterized in that, The process includes the following steps: Weigh out the compound nutrient solution, additives, biogas slurry and powder as needed and add them to the mixer. Set the mixer to 600-800 r / min and stir for 20-30 minutes to obtain a nutrient solution suitable for hydroponic plants.

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