CN110683881A - Soilless culture nutrient solution and preparation method and application thereof - Google Patents
Soilless culture nutrient solution and preparation method and application thereof Download PDFInfo
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- CN110683881A CN110683881A CN201911046114.9A CN201911046114A CN110683881A CN 110683881 A CN110683881 A CN 110683881A CN 201911046114 A CN201911046114 A CN 201911046114A CN 110683881 A CN110683881 A CN 110683881A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
- A01G24/12—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material containing soil minerals
- A01G24/15—Calcined rock, e.g. perlite, vermiculite or clay aggregates
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/20—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
- A01G24/28—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material containing peat, moss or sphagnum
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G31/00—Soilless cultivation, e.g. hydroponics
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Soil Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fertilizers (AREA)
Abstract
The invention relates to the field of agricultural soilless culture, and particularly discloses a soilless culture nutrient solution and a preparation method and application thereof. The soilless culture nutrient solution comprises the following components in mg/L: 300 portions of potassium nitrate 305, 158 portions of ammonium nitrate 162, 66 to 70 portions of monopotassium phosphate, 244 portions of magnesium sulfate heptahydrate 248, 200 portions of organic chelated calcium 400, 20 to 40 portions of disodium iron ethylenediaminetetraacetate, 2.6 to 3.0 portions of boric acid, 2.0 to 2.2 portions of manganese sulfate tetrahydrate, 0.20 to 0.24 portion of zinc sulfate heptahydrate, 0.075 to 0.085 portion of copper sulfate pentahydrate and 0.015 to 0.025 portion of ammonium molybdate tetrahydrate. The invention can ensure the effectiveness, the balance and the pH stability of each nutrient element and improve the utilization efficiency of the nutrient solution. The invention also provides a method for preparing the nutrient solution, which is simple, convenient and efficient, has better popularization value and is suitable for soilless culture of lettuce.
Description
Technical Field
The invention relates to the field of agricultural soilless culture. In particular to a soilless culture nutrient solution and a preparation method and application thereof.
Background
The soilless culture uses artificially prepared nutrient solution or solid matrix and nutrient solution to replace soil for crop culture, is beneficial to standardized production, mechanized operation and information management, has the advantages of water saving, fertilizer saving, land saving, labor saving and the like, and is an important culture mode for realizing safe, high-quality, high-yield and high-efficiency production of facility vegetables. The soilless culture gets rid of the limitation of soil, and also loses the water and fertilizer 'entitlement' of natural soil, the water and fertilizer required by the growth and development of crops mainly depend on nutrient solution, and the nutrient characteristics and management of the nutrient solution are the core of the soilless culture.
The nutrient characteristics of the nutrient solution are closely related to the nutrient solution formula and the preparation method thereof. According to the nutrient requirement characteristics and physiological balance principle of crop growth and development, certain compounds containing essential nutrient elements of crops are selected, and the proportion and the dosage of each compound are determined so as to obtain the nutrient solution formula for the soilless culture of the crops. At present, nutrient solution formulas widely applied in China include Hoagland formulas, Kawasaki formulas, special formulas of the university of south China and the like. Nutrients in the existing commercial nutrient solution formula are mostly supplied in the form of simple coordination compounds, such as calcium nitrate and magnesium sulfate, and insoluble compounds are easily generated in the preparation process, so that the effectiveness of the nutrients is influenced, and the component imbalance of the nutrient solution is caused. Therefore, compounds in the formulation which do not interact with each other are usually dissolved and diluted by placing them together, such as calcium nitrate and potassium nitrate, potassium dihydrogen phosphate or ammonium dihydrogen phosphate is dissolved together with magnesium sulfate, or prepared into a mother liquor a centered on a calcium salt, a mother liquor B centered on a phosphate salt, and a mother liquor C of trace elements. However, the preparation process of the nutrient solution is complicated, labor and time are wasted, and the condition of precise weighing of the nutrient solution fertilizer is often not available in the production line, so that denaturation such as calcium salt, phosphate, sulfate and the like is easy to occur in the preparation operation of the nutrient solution, the effectiveness of nutrient elements such as Ca, P, S and the like in the nutrient solution is reduced, nutrient components are unbalanced, the pH value is increased, the nutrient requirements of crops are difficult to meet, ion toxicity is easy to cause, and the generation of denatured substances also easily causes the problems of blockage of an irrigation system, damage to electronic components and the like. And adopt nutrient solution preparation equipment although can simplify the process, improve labor efficiency, nevertheless need install multichannel and annotate fertile device to avoid the mixture of high concentration fertilizer liquid, and then increased the cost of modern liquid manure integration intelligence management and control equipment.
Therefore, the current nutrient solution formula needs to be further optimized, the preparation process of the nutrient solution is simplified, the nutrient effectiveness of the nutrient solution in the preparation process of the nutrient solution is prevented from being influenced, and conditions are created for large-scale application of the nutrient solution cultivation technology.
Disclosure of Invention
One of the purposes of the invention is to provide a formula of a (lettuce) soilless culture nutrient solution aiming at the problems of reduced nutrient element effectiveness, unbalanced ion components, labor and time consumption for nutrient solution preparation and the like caused by nutrient ion denaturation in the preparation and management processes of the soilless culture nutrient solution, and according to the actual nutrient requirements of crops.
In order to achieve the purpose of the invention, the technical scheme of the invention is as follows:
a soilless culture nutrient solution comprises the following components in concentration: 300-305mg/L potassium nitrate, 162mg/L ammonium nitrate, 66-70mg/L potassium dihydrogen phosphate, 244-248mg/L magnesium sulfate heptahydrate, 400mg/L organic chelated calcium, 20-40mg/L disodium ferric ethylenediaminetetraacetate, 2.6-3.0mg/L boric acid, 2.0-2.2mg/L manganese sulfate tetrahydrate, 0.20-0.24mg/L zinc sulfate heptahydrate, 0.075-0.085mg/L copper sulfate pentahydrate and 0.015-0.025mg/L ammonium molybdate tetrahydrate.
The invention reasonably optimizes and proportions the composition of the soilless culture nutrient solution and the use amount of each component, so that each component can stably exist and is not easy to denature, and the balance of ionic components and the requirement of the components on nutrients are ensured.
In the present invention, the nutrient solution comprises the following components in concentration: 303.5mg/L of potassium nitrate, 160mg/L of ammonium nitrate, 68.04mg/L of monopotassium phosphate, 246.48mg/L of magnesium sulfate heptahydrate, 400mg/L of organic chelated calcium 200, 20-40mg/L of disodium ferric ethylenediamine tetraacetate, 2.86mg/L of boric acid, 2.13mg/L of manganese sulfate tetrahydrate, 0.22mg/L of zinc sulfate heptahydrate, 0.08mg/L of copper sulfate pentahydrate and 0.02mg/L of ammonium molybdate tetrahydrate.
In the present invention, the organic chelated calcium is amino acid chelated calcium (Ca [ HCOOCH (NH))2)CH2COO]2) The effective calcium content of the amino acid chelated calcium is 10 +/-0.5%, so that the amino acid chelated calcium is beneficial to absorption and utilization of plants.
In the invention, the nutrient solution also comprises a pH regulator, wherein the pH regulator is phosphoric acid or citric acid.
In the invention, the pH value of the nutrient solution is 5.5-6.5.
According to the invention, the pH value can be adjusted to 5.5-6.5 by phosphoric acid or citric acid according to the variety of cultivated crops, so as to meet the requirements of different crops.
Another object of the present invention is to provide a method for preparing the above nutrient solution, comprising the steps of:
(1) weighing each component respectively and mixing uniformly to form the composite solid fertilizer;
(2) mixing the composite solid fertilizer with water to prepare mother liquor, wherein the concentration of each component in the mother liquor is 50-250 times of that of each component in the nutrient solution;
(3) and mixing the mother solution with water to prepare the nutrient solution.
The components in the nutrient solution formula can stably exist in the same system, the denaturation of the components is not easy to generate, the components are not required to be classified and prepared into various mother solutions, the preparation process is simplified, the problem that the nutrient effectiveness of the nutrient solution is easily influenced in the preparation process of the nutrient solution is solved, and the nutrient solution formula is suitable for large-scale production.
The method of the present invention further comprises step (4): adjusting the pH value of the nutrient solution to 5.5-6.5.
According to the preparation method of the nutrient solution, the compounds with the required dosage for preparing the nutrient solution in unit volume are respectively weighed according to the formula of the nutrient solution, and are uniformly mixed to form the compound solid fertilizer required by the nutrient solution in unit volume. In the production, the composite solid fertilizer amount is calculated and weighed according to the volume of the nutrient solution prepared according to actual needs, dissolved in water, poured into a nutrient solution storage tank, added with clear water to a constant volume and stirred uniformly to form the nutrient solution; or weighing a certain amount of the compound solid fertilizer, adding clear water into a container for dissolving to prepare a nutrient solution mother solution, and quantitatively and uniformly mixing with the clear water under the control of modern water and fertilizer integrated equipment during irrigation to form the nutrient solution.
According to another preparation method of the nutrient solution, compounds with the formula amount being multiple times of that of the nutrient solution are respectively weighed, dissolved in clear water in a container, subjected to constant volume and uniformly stirred, and then the nutrient solution mother solution (nutrient solution concentrated solution, namely high-concentration nutrient solution) with the concentration being multiple times is prepared. In the production, the nutrient solution mother liquor is measured according to the nutrient solution volume configured according to actual needs and the concentration multiple of the nutrient solution mother liquor, poured into a nutrient solution storage tank, added with clear water to a constant volume and uniformly stirred to form the nutrient solution; or during irrigation, the nutrient solution is quantitatively and uniformly mixed with clear water under the control of modern water and fertilizer integrated equipment to form the nutrient solution (the mixing configuration is a part of irrigation in production and is a dynamic process).
In the invention, the modern water and fertilizer integrated equipment for irrigation is provided with a single fertilizer injection device.
In the invention, the compound solid fertilizer required by the nutrient solution of unit volume can be prepared indoors or produced in factories by special persons (technicians) in a production park/base to form a commodity, and the nutrient solution is prepared by dissolving the compound solid fertilizer in a nutrient solution irrigation management area.
The invention further aims to provide the application of the nutrient solution or the method in soilless culture of lettuce.
In the application of the invention, the application comprises the steps of planting lettuce in a matrix and providing the nutrient solution.
In the application of the invention, the substrate comprises turf, vermiculite and perlite in a mass ratio of 2:1: 1.
The invention has the beneficial effects that:
compared with the prior art, the formula of the composite nutrient solution provided by the invention can better ensure the effectiveness, the balance and the pH stability of each nutrient element in the preparation and management processes of the nutrient solution, improve the utilization efficiency of the nutrient solution and ensure the yield and the quality of crops. The method for preparing the nutrient solution is simple, convenient and efficient, A, B, C mother liquor does not need to be prepared respectively, the cost of modern water and fertilizer integrated equipment is reduced, and the method has good popularization value.
Detailed Description
Preferred embodiments of the present invention will be described in detail with reference to the following examples. It is to be understood that the following examples are given for illustrative purposes only and are not intended to limit the scope of the present invention. Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the spirit and scope of this invention.
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The compounds of potassium nitrate, ammonium nitrate, monopotassium phosphate, magnesium sulfate heptahydrate, organic chelated calcium, disodium iron ethylenediamine tetraacetate, boric acid, manganese sulfate tetrahydrate, zinc sulfate heptahydrate, copper sulfate pentahydrate and ammonium molybdate tetrahydrate are all commercial products.
The organic calcium chelate used in the embodiment of the present invention is calcium amino acid chelate (Ca [ HCOOCH (NH) ] unless otherwise specified2)CH2COO]2) The content of effective calcium is 10 plus or minus 0.5 percent.
Example 1
The embodiment provides a soilless culture nutrient solution, which comprises the following specific formula: the 1L nutrient solution contains 303.5mg of potassium nitrate, 160mg of ammonium nitrate, 68.04mg of monopotassium phosphate, 246.48mg of magnesium sulfate heptahydrate, 300mg of organic chelated calcium, 20mg of disodium iron ethylenediamine tetraacetic acid, 2.86mg of boric acid, 2.13mg of manganese sulfate tetrahydrate, 0.22mg of zinc sulfate heptahydrate, 0.08mg of copper sulfate pentahydrate and 0.02mg of ammonium molybdate tetrahydrate.
The soilless culture nutrient solution is prepared according to the following steps:
(1) weighing various compounds according to the formula, namely 303.5g of potassium nitrate, 160g of ammonium nitrate, 68.04g of monopotassium phosphate, 246.48g of magnesium sulfate heptahydrate, 300g of organic chelated calcium, 20g of disodium iron ethylenediaminetetraacetate, 2.86g of boric acid, 2.13g of manganese sulfate tetrahydrate, 0.22g of zinc sulfate heptahydrate, 0.08g of copper sulfate pentahydrate and 0.02g of ammonium molybdate tetrahydrate, and uniformly mixing to obtain the compound solid fertilizer;
(2) completely dissolving the compound solid fertilizer by using water as a solvent, adding the compound solid fertilizer into a 10L container, injecting clear water to a constant volume, and uniformly stirring to prepare 10L of nutrient solution mother liquor with the concentration multiple of 100 times;
(3) under the automatic management and control of modern liquid manure integration equipment, the nutrient solution mother liquor and the clear water of this embodiment that the concentration multiple is 100 times are according to 1: 99, and in the process, modern water and fertilizer integrated equipment can detect the pH value of the nutrient solution on line in real time, and automatically absorb phosphoric acid to adjust the pH value of the nutrient solution to be within the range of 5.6-6.5, so as to obtain the soilless culture nutrient solution of the embodiment. The nutrient solution has no precipitate after standing for at least 10 days.
Example 2
The embodiment provides a soilless culture nutrient solution, which comprises the following specific formula: the 1L nutrient solution contains 300mg of potassium nitrate, 158mg of ammonium nitrate, 66mg of monopotassium phosphate, 244mg of magnesium sulfate heptahydrate, 200mg of organic chelated calcium, 20mg of disodium iron ethylenediamine tetraacetic acid, 2.6mg of boric acid, 2.0mg of manganese sulfate tetrahydrate, 0.20mg of zinc sulfate heptahydrate, 0.075mg of copper sulfate pentahydrate and 0.015mg of ammonium molybdate tetrahydrate.
The preparation method comprises the following steps: the same procedures as in steps (1) and (2) of example 1 were carried out to prepare 10L of the mother liquor of the nutrient solution of this example. Then, 0.4m of nutrient solution is injected into the nutrient solution storage tank (tank)3Adding nutrient solution mother liquor into nutrient solution storage tank, adding clear water, and metering volume to 1m3And stirring until the mixture is uniformly mixed. Detecting in real time and adjusting pH to 5.5-6.5 with phosphoric acid to obtain 1m3The soilless culture nutrient solution. The nutrient solution has no precipitate after standing for at least 10 days.
Example 3
The embodiment provides a soilless culture nutrient solution, which comprises the following specific formula: 1L nutrient solution contains 305mg of potassium nitrate, 162mg of ammonium nitrate, 70mg of monopotassium phosphate, 248mg of magnesium sulfate heptahydrate, 400mg of organic chelated calcium, 40mg of ferric disodium ethylene diamine tetraacetate, 3.0mg of boric acid, 2.2mg of manganese sulfate tetrahydrate, 0.24mg of zinc sulfate heptahydrate, 0.085mg of copper sulfate pentahydrate and 0.025mg of ammonium molybdate tetrahydrate.
The preparation method comprises the following steps: the same procedures as in steps (1) and (2) of example 1 were carried out to prepare 10L of the mother liquor of the nutrient solution of this example. The conductivity (namely the concentration of the nutrient solution) of the nutrient solution working solution is set to be 1.2mS-1The nutrient solution mother liquor is automatically diluted by 100 times by modern water and fertilizer integrated equipment, and meanwhile, the pH value of the nutrient solution is detected in real time and adjusted to 5.5-6.5 by phosphoric acid, so that the soilless culture nutrient solution of the embodiment which is directly used for irrigation in production is prepared. The nutrient solution has no precipitate after standing for at least 10 days.
Comparative example 1
The comparison example provides a soilless culture nutrient solution, and the specific formula is as follows: the 1L nutrient solution contains 303.5mg of potassium nitrate, 472mg of calcium nitrate, 160mg of ammonium nitrate, 68.04mg of monopotassium phosphate, 246.48mg of magnesium sulfate heptahydrate, 20mg of disodium iron ethylenediamine tetraacetic acid, 2.86mg of boric acid, 2.13mg of manganese sulfate tetrahydrate, 0.22mg of zinc sulfate heptahydrate, 0.08mg of copper sulfate pentahydrate and 0.02mg of ammonium molybdate tetrahydrate.
The preparation method of the soilless culture nutrient solution is the same as that of the embodiment 1. The nutrient solution is allowed to stand for 7-10 days, and precipitate is generated.
Experimental example 1
Carrying out lettuce matrix cultivation in a multifunctional greenhouse leaf vegetable experimental area in the academy of agriculture and forestry of Beijing, wherein the lettuce variety is Fulandri (Flandria RZ, Lactuca sativa 'Flandria'), and the matrix is turf with the mass ratio of 2:1: vermiculite: perlite. And (3) fully washing the matrix with deionized water before field planting, and irrigating with a nutrient solution to be detected. The specific cultivation steps are as follows:
(1) lettuce is planted in the substrate, and the surface of the substrate is covered with a plastic film to prevent the substrate moisture from evaporating.
(2) And (3) automatically injecting the nutrient solution to be tested into the matrix by modern water and fertilizer integrated equipment based on an irrigation system embedded with a system program.
(3) And (5) carrying out lettuce matrix cultivation management according to a conventional mode. Lettuce lasts for 33 days from planting to harvesting.
The soilless culture nutrient solutions of example 1 and comparative example 1 were planted under the same conditions by the above-described culture procedure, respectively, and the culture effect was observed and tested. The results are as follows:
lettuce cultivated by the nutrient solution medium in example 1 grows well, and the results of measuring the yield, dry matter amount, vitamin C, soluble sugar and nitrate nitrogen in example 1 and comparative example 1 after harvesting the lettuce are shown in Table 1. The measurement results of the lettuce yield (fresh/dry weight) show that the average overground fresh weight of the single lettuce in the embodiment 1 is 203.12 g/lettuce, which is slightly lower than that in the comparative example 1(225.73 g/lettuce), and the quality of the dried lettuce is higher than that in the comparative example 1; by analyzing the quality index of the lettuce, the Vc, soluble sugar and nitrate contents of the lettuce in the embodiment 1 are not obviously different from those in the comparative example 1, which shows that the nutrient solution provided in the embodiment 1 can provide nutrients required by the growth of the lettuce and ensure the yield and quality of the lettuce.
TABLE 1 fresh/dry weight of lettuce and Vc, soluble sugar and nitrate nitrogen content test results
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A soilless culture nutrient solution, characterized in that it comprises the following components in concentration: 300-305mg/L potassium nitrate, 162mg/L ammonium nitrate, 66-70mg/L potassium dihydrogen phosphate, 244-248mg/L magnesium sulfate heptahydrate, 400mg/L organic chelated calcium, 20-40mg/L disodium ferric ethylenediaminetetraacetate, 2.6-3.0mg/L boric acid, 2.0-2.2mg/L manganese sulfate tetrahydrate, 0.20-0.24mg/L zinc sulfate heptahydrate, 0.075-0.085mg/L copper sulfate pentahydrate and 0.015-0.025mg/L ammonium molybdate tetrahydrate.
2. The nutritional liquid according to claim 1, wherein the nutritional liquid comprises the following components in concentrations: 303.5mg/L of potassium nitrate, 160mg/L of ammonium nitrate, 68.04mg/L of monopotassium phosphate, 246.48mg/L of magnesium sulfate heptahydrate, 400mg/L of organic chelated calcium 200, 20-40mg/L of disodium ferric ethylenediamine tetraacetate, 2.86mg/L of boric acid, 2.13mg/L of manganese sulfate tetrahydrate, 0.22mg/L of zinc sulfate heptahydrate, 0.08mg/L of copper sulfate pentahydrate and 0.02mg/L of ammonium molybdate tetrahydrate.
3. The nutrient solution according to claim 1 or 2, wherein the organic chelated calcium is amino acid chelated calcium, and the effective calcium content of the amino acid chelated calcium is 10 ± 0.5%.
4. The nutritional solution according to any one of claims 1 to 3, wherein the nutritional solution further comprises a pH regulator, wherein the pH regulator is phosphoric acid or citric acid.
5. The nutritional liquid according to any one of claims 1 to 4, wherein the pH of the nutritional liquid is 5.5 to 6.5.
6. A method of preparing the nutritional liquid according to any one of claims 1 to 5, comprising the steps of:
(1) weighing each component respectively and mixing uniformly to form the composite solid fertilizer;
(2) mixing the composite solid fertilizer with water to prepare mother liquor, wherein the concentration of each component in the mother liquor is 50-250 times of that of each component in the nutrient solution;
(3) and mixing the mother solution with water to prepare the nutrient solution.
7. The method of claim 6, further comprising step (4): adjusting the pH value of the nutrient solution to 5.5-6.5.
8. Use of the nutrient solution according to any one of claims 1-5 or the method according to claim 6 or 7 for soilless culture of lettuce.
9. Use according to claim 8, characterized in that it comprises the steps of planting lettuce in a substrate and providing said nutrient solution.
10. The use according to claim 9, wherein the substrate comprises peat, vermiculite and perlite in a 2:1:1 mass ratio.
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| CN112430154A (en) * | 2020-12-01 | 2021-03-02 | 北京市农业技术推广站 | AB water-soluble fertilizer special for soilless culture of fruit vegetables and preparation method thereof |
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Application publication date: 20200114 |