CN116813389A - An all-element biochemical chelated liquid water-soluble fertilizer and its preparation method - Google Patents

Abstract

The invention relates to an all-element biochemical chelated liquid water-soluble fertilizer, which includes the following components by weight: macroelements: nitrogen + phosphorus + potassium: 100~650g/L; medium elements: 5~30g/L, magnesium 5~30g/L, sulfur 5~50g/L; trace elements: copper, iron, manganese, zinc, boron, molybdenum, 2~100g/L; one or more of the special elements silicon, cobalt, iodine and strontium , silicon 0.5~2g/L, cobalt 0.5~2g/L, iodine 0.5~2g/L, strontium 0.5~2g/L; one or more functional elements humic acid, amino acid, organic acid, humic acid : 2~80g/L, amino acid: 2~100g/L, chitosan oligosaccharide: 5~30g/L, organic acid: 10~50g/L; chelating agent: 5~50g/L, wetting agent: 5~50g /L; wherein the chelating agent is a mixture of three types of ethylenediaminetetraacetic acid, glycine and organic acids or a mixture of four types of iminodisuccinic acid, and the synergistic element humectant is propylene glycol, polyethylene glycol, One or a mixture of glycerol, sorbitol, xylitol, and mannitol. The invention realizes perfect mutual solubility of up to 17 kinds of nutrient elements and solves the problem of low fertilizer absorption rate and utilization efficiency.

Description

An all-element biochemical chelated liquid water-soluble fertilizer and its preparation method

Technical field

The invention belongs to the field of crop nutrition preparations, and specifically relates to an all-element biochemical chelated liquid water-soluble fertilizer and a preparation method thereof.

Background technique

Our country has a vast territory, with a large span of north-south latitudes and east-west longitudes, diverse soil types, and rich varieties of crops. With the rapid development of the chemical fertilizer industry in recent years, reliance on high investment in chemical fertilizers and high-intensity multiple cropping index has caused the soil environment to gradually deteriorate. The development of modern agriculture is restricted by problems such as low fertilizer utilization rate, increasingly prominent water resource conflicts, reduced quality of agricultural products, excessive pesticide residues in agricultural products, and gradually reduced agricultural comprehensive yields.

There are the following problems in the existing fertilizer technology: most fertilizers are mainly three-element fertilizers and five-element fertilizers, which have relatively single nutritional elements, causing repeated labor losses in agricultural use; the multiple elements in fertilizers are antagonistic to each other and the utilization rate is low, causing irrigation Pipes are blocked and fertilizers are wasted; most of the current all-element water-soluble fertilizers use a single chelating agent for trace elements and are mainly chemical components. They metabolize slowly in the soil, causing groundwater pollution, and the elements they can chelate are not comprehensive enough.

The following are several comparative documents retrieved by our novel search: The first article: CN202210074940. and preparation method thereof". Both documents involve the protection of the formulation of multi-element water-soluble fertilizers. Both involve the use of chelating agents to achieve full water solubility of a variety of different nutritional elements, and both are authorized patents. The difference lies in the chelated elements in the fertilizer's composition. There are differences. It can be seen that it is very difficult to increase the number of elements that can be chelated in this field. We believe that both documents still have shortcomings: 1. The elements that can be chelated by the two are not comprehensive enough, for example, they lack special elements, etc., indicating that the research and application of chelating agents are not good enough; 2. However, neither of them proposed how such a high all-element water-soluble fertilizer can solve the actual problem of low fertilizer absorption rate and utilization rate by plants. The second document only talked about its high utilization rate, but there was no corresponding technical means and actual experimental proof to support it.

Contents of the invention

The purpose of the invention is to provide an all-element biochemical chelated liquid water-soluble fertilizer and its preparation method. Through the process of biochemical chelation, the invention uses the complementary coordination of multiple types of chelating agents to perfectly block the relationship between nutritional elements: The antagonism of calcium phosphorus, phosphorus zinc, phosphorus copper, phosphorus iron, phosphorus manganese, sulfur calcium and other ions achieves perfect mutual solubility of up to 17 kinds of nutrients. Through the combined use of functional elements and synergistic elements, after the nutrients are fully chelated, The sugar alcohol molecules in the synergistic elements act as messengers, quickly bringing nutrients into plant leaf cells and roots, thereby solving the problem of low plant absorption rates and low utilization efficiency of fertilizers. This water-soluble fertilizer can quickly change the nutritional status of crops, stimulate crop potential, and improve the ability of crops to withstand environmental stress, thereby achieving the purpose of increasing production and efficiency.

In order to achieve the above objects, the technical solutions adopted by the present invention are:

An all-element biochemical chelated liquid water-soluble fertilizer, characterized in that: the all-element biochemical chelated water-soluble fertilizer includes the following components by weight: macroelements: nitrogen + phosphorus + potassium: 100~650g/L; medium Microelements: calcium: 5~30g/L, magnesium: 5~30g/L, sulfur: 5~50g/L; trace elements: copper, iron, manganese, zinc, boron, molybdenum: 2~100g/L; special elements One or more of silicon, cobalt, iodine, and strontium. Different special elements are selected according to different crops. The weight ratio is: silicon: 0.5~2g/L, cobalt: 0.5~2g/L, iodine: 0.5~2g /L, strontium: 0.5~2g/L; one or more of the functional elements humic acid, amino acid, and organic acid, the weight ratio is humic acid: 2~80g/L, amino acid: 2~100g/ L. Chitosan oligosaccharide: 5~30g/L, organic acid: 10~50g/L; synergistic elements: chelating agent: 5~50g/L, wetting agent: 5~50g/L; the chelating agent is ethylene glycol A mixture of three kinds of aminetetraacetic acid, glycine and organic acids or a mixture of four kinds of iminodisuccinic acid. The organic acid in the chelating agent is citric acid or propionic acid. The weight ratio of the chelating agent needs to be according to The content proportions of phosphorus in the macroelements and metal elements in the medium and trace elements must be adjusted accordingly to achieve full chelation of the nutrients; the synergistic element humectants are propylene glycol, polyethylene glycol, glycerol, sorbitol, and wood. One or a mixture of sugar alcohol and mannitol.

Further, the mass percentage of the large amount of elements nitrogen: phosphorus: potassium in the present invention is 1:3:2; the precursor of nitrogen is one or a mixture of several of urea, ammonium sulfate, and dimethylurea. ; The precursor of phosphorus is one or a mixture of polyphosphoric acid, potassium polyphosphate, and phosphorous acid; the precursor of potassium is potassium hydroxide, potassium dihydrogen phosphate or dipotassium hydrogen phosphate, or potassium carbonate. One or a mixture of several.

Further, the mass percentage of the medium elements calcium, magnesium and sulfur in the present invention is 5:25:20; the precursor of calcium is one or a mixture of calcium chloride, calcium nitrate and calcium formate. ; The precursor of magnesium is one or a mixture of one or more of magnesium sulfate and magnesium chloride; the precursor of sulfur is one or more of potassium sulfate, magnesium sulfate, zinc sulfate, and copper sulfate. mixture.

Further, the mass percentage of the trace elements copper, iron, manganese, zinc, boron and molybdenum in the present invention is 1.5:1:2.5:3.5:1.4:1; the precursors of the trace elements are ferrous sulfate and copper sulfate. , manganese sulfate, zinc sulfate, zinc oxide, boric acid, octaboron tetrahydrate or ammonium molybdate.

Further, the precursor of the special element silicon in the present invention is silicone oil or organic silicon; the precursor of cobalt is cobalt sulfate; the precursor of iodine is potassium iodate or potassium iodide; the precursor of strontium is strontium carbonate or strontium sulfate; Special elements are selected depending on the crop.

Further, the precursor of the functional element humic acid in the present invention is one or a mixture of several of potassium fulvic acid, biochemical fulvic acid, fulvic acid, and potassium fulvic acid; the precursor of the amino acid Yes; one or a mixture of several of glycine, proline, glutamic acid, lysine, alanine, threonine, and polyaspartic acid; the precursor of the chitosan oligosaccharide is an amino acid Oligosaccharide; the precursor of the organic acid is one or a mixture of several of citric acid, polyglutamic acid, formic acid, acetic acid, and salicylic acid.

Further, the order of use and dosage of the chelating agents in the present invention are as follows: ethylenediaminetetraacetic acid>citric acid, glycine>iminodisuccinic acid.

The preparation method of the all-element biochemical chelated liquid water-soluble fertilizer according to the present invention includes the following steps:

Step 1: Add polyphosphoric acid and phosphorous acid to reactor A, then add water and stir slowly. Slowly add potassium hydroxide to gradually increase the temperature to 70-80 degrees. Add urea, dipotassium hydrogen phosphate, etc. gradually, and continue stirring. Until it is completely dissolved, a large amount of element stock solution A is obtained;

Step 2: Add deionized water to reactor B, then add corresponding proportions of medium elements calcium and magnesium; trace elements copper, iron, manganese, zinc, molybdenum, etc. and special elements cobalt and strontium according to crop needs, and heat When it is completely dissolved at 80 degrees, add the chelating agent: ethylenediaminetetraacetic acid and organic acid, mix, stir and chelate for 40-50 minutes, and wait until the liquid becomes clear to obtain solution B containing medium, trace and special elements;

Step 3: Add deionized water to the C reactor, then heat the temperature to 60-70 degrees, add functional elements humic acid, amino acids, organic acids, chitosan oligosaccharides in proportion, then add boron, and other ingredients according to crop needs. Select special elements such as silicone, iodine, etc., and wait until they are completely dissolved and translucent to obtain solution C containing functional elements and special elements;

Step 4: Add solution B of medium and trace elements obtained in reaction kettle B into reaction kettle A, continue to heat and stir, if no crystals precipitate, add solution C, and add synergistic element wetting agent, such as adding an equal weight ratio of After adjusting the volume of propylene glycol and polyethylene glycol, continue to stir, discharge the bubbles and continue to adjust the volume, and detect the pH value. The pH value is between 4 and 9, thus producing a full-element biochemical chelated liquid water-soluble fertilizer of the present invention. The prepared liquid water-soluble fertilizer has a specific gravity of 1.25 to 1.7.

Furthermore, the types of special elements described in the present invention need to be selected according to the crops. During processing, the two special elements cobalt and strontium are added and chelated with a chelating agent in step two. The special elements silicon and iodine are Then use organic silicon and iodine to add in step three.

Compared with the prior art, the beneficial effects of the present invention are as follows:

1. The all-element biochemical chelated liquid water-soluble fertilizer of the present invention can be completely dissolved in water, and has obvious advantages compared with traditional nitrogen, phosphorus and potassium fertilizers, multi-component compound fertilizers and conventional water-soluble fertilizers. All elements, fully water-soluble, fast absorption by crops, high utilization rate, and stronger crops; the use of functional elements and synergistic elements can significantly improve the rapid absorption and utilization of nutrient elements by crop roots and leaves. Various functional elements are endogenous hormones of plants. It metabolizes front-end substances, thereby activating the activity of multiple enzymes in plants, and improving the ability of crops to withstand environmental stress; with rapid supplementation of comprehensive nutrients, plants are stronger, yield is higher, and quality is better.

2. The all-element biochemical chelated liquid water-soluble fertilizer of the present invention uses the complementary coordination of multiple types of chelating agents through the process of biochemical chelation to perfectly block the relationship between nutritional elements: calcium phosphorus, zinc phosphorus, copper phosphorus, iron phosphorus, phosphorus The antagonism of various different ions such as manganese, sulfur and calcium has achieved perfect mutual solubility of up to 17 kinds of nutrients. This is the first time in this field that this has been achieved. Through the combined use of functional elements and synergistic elements, after the nutrients are fully chelated, the sugar alcohol molecules of the wetting agents in the synergistic elements act as messengers, quickly bringing the nutrients into plant leaf cells and root cells. It greatly reduces the fixation of metal elements by soil colloids, thereby solving the problem of low fertilizer absorption rate and utilization efficiency by plants. The following table shows the application methods and absorption and utilization rates of different types of fertilizers at home and abroad. From this table, it can be clearly seen that the utilization rate of N-P-K-trace elements in the water-soluble fertilizer of the present invention is greatly improved compared to the existing technology. Significant improvement.

Note: ①The average fertilizer utilization rate data in the above table comes from the Chinese Academy of Agricultural Sciences. ② The data on the absorption and utilization rates of multi-element solid fertilizers and water-soluble fertilizers come from the literature "Theory and Practice of Fertilizer Saving and Efficiency Increase in Intensive Farmland" (by He Ping, Jin Jiyun et al., Beijing Science Press, 2012.06 ISBN). ③The source of the absorption and utilization rate of all-element biochemical chelated liquid fertilizer is the data obtained from the tests conducted by the applicant's technical team in the experimental field. This data takes lettuce as an example. The same substrate is used for cultivation, and the fertilization method is drip irrigation and foliar spraying. Compared with general water-soluble fertilizers, under the same fertilization amount (pure) and watering amount, full-element biochemical fertilizers are used. The lettuce plants treated with chelated liquid fertilizer were significantly better than the control in terms of growth, leaf color, and leaf width. The above-ground yield in 50 days was 17% higher than that of the control group, which inferred that the fertilizer absorption and utilization rate was significantly higher than that of the control group.

3. The all-element biochemical chelated liquid water-soluble fertilizer of the present invention was observed in the laboratory through refrigerator cold storage at -18°C and thermostat hot storage at 54°C for 14 days each. The all-element biochemical chelated liquid water-soluble fertilizer did not precipitate or separate. layer, turbidity, extremely stable properties, can be stored for a long time and is not easy to precipitate. At the same time, after the prepared all-element biochemical chelated liquid water-soluble fertilizer sample was stored in a room temperature for 2 years, the appearance showed no precipitation, stratification, or turbidity. The performance of the all-element biochemical chelated liquid water-soluble fertilizer in different temperature steps completely proves that the all-element biochemical chelated liquid water-soluble fertilizer completely solves the problem of perfect mutual solubility of 17 kinds of nutritional elements. It is in a leading position in the country and can simultaneously combine 17 kinds of nutrients. The nutrients are perfectly soluble in each other, the only successful example we know of. At present, the same industry can achieve nitrogen, phosphorus and potassium elements to 400g/L, and trace elements to 10-50 g/L, but we can achieve nitrogen, phosphorus and potassium elements to 400g/L, and trace elements to 100 g/L. And the properties can be kept very stable.

4. As a new type of fertilizer, the all-element biochemical chelated liquid water-soluble fertilizer of the present invention overcomes the shortcomings of traditional fertilizer application and low utilization rate, and is more convenient to use and has higher utilization rate. It can be sprayed, flushed and drip-irrigated, which not only reduces the fixation of trace elements in the soil, but also directly acts on the above-ground parts of the crops, reducing the energy consumption caused by crop root absorption and nutrient transportation, and further increasing the fertilizer rate, thereby achieving fertilizer saving. water saving purpose.

Detailed ways

The present invention will be further described in detail below with reference to examples. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

Example 1:

(1) Take 350g of phosphoric acid and add it to reactor A, slowly add 150g of water, and gradually add 150g of potassium hydroxide. When the temperature rises to about 70 degrees, add 170g of urea and stir to completely dissolve. When it is completely transparent, a large amount of element solution A is obtained;

(2) In reactor B, add 21g of trace elements ferrous sulfate, 60g of copper sulfate, 55g of manganese sulfate, 65g of zinc sulfate, 30g of boric acid, 1g of ammonium molybdate and 2.5g of special element cobalt sulfate, add 200g of deionized water and heat When it is completely dissolved, add 80g of ethylenediaminetetraacetic acid, 30g of the medium element magnesium sulfate heptahydrate, 50g of calcium nitrate, and 50g of citric acid. Control the temperature at 85 degrees and stir for 40 minutes to obtain the medium and trace element solution B;

(3) Add 80g of water to the C reactor, add 30g of glycine, 10g of polyglutamic acid, and 5g of chitosan oligosaccharide, heat and stir to 60 degrees, add 5g of special element silicone, and 5g of potassium iodate, and continue stirring until completely dissolved and translucent. , obtain C special element solution.

(4) Add medium and trace element solution B obtained in reaction kettle B into reaction kettle A, continue to heat and stir, if no crystal H is precipitated, add solution C, add 10g of glycerol, continue stirring to remove bubbles, and continue to determine capacity, detect the pH value, and the pH is between 4.8 and 5.0, that is, a kind of all-element biochemical chelated liquid water-soluble fertilizer of the present invention is prepared. The specific gravity of the prepared all-element biochemical chelated liquid water-soluble fertilizer is 1.45 to 1 .50.

Period of use: full growth period of crops

Dosage and usage: dilute 600-1000 times, spray on foliage or drip irrigation.

The fertilizer is used three times during the entire growth period of the crop. The fertilizer is used in the early flowering stage, the late stage of fruit and vegetable fruit setting, and the fruit expansion stage. Compared with the control, the crop yield increases by more than 15%, and the actual commercial rate reaches more than 95%.

Example 2:

(1) Add 200g of polyphosphoric acid into reactor A, add 250g of water and stir, slowly add 140g of potassium hydroxide, raise the temperature to 80 degrees, add 220g of urea and 200g of dipotassium hydrogen phosphate into reactor A, stir and dissolve completely. Obtain a large amount of element solution A;

(2) In reactor B, add 7g of trace elements copper sulfate, 8g of ferrous sulfate, 20g of zinc sulfate, 7g of boric acid, add 110g of water, heat until completely dissolved, add 15g of citric acid, 30g of ethylenediaminetetraacetic acid, and add a medium amount Elements: 30g magnesium sulfate heptahydrate, 50g calcium formate, 50g citric acid, control the temperature at 85 degrees and stir for 40 minutes to obtain medium and trace element solution B;

(3) Add 100g of water to the C reaction kettle, add 80g of fulvic acid and 10g of glycine, stir and heat to 60 degrees, add 5g of special element potassium iodate, and completely dissolve to obtain C solution.

(4) Add the trace element solution B obtained in the B reactor to the A reactor, continue to heat and stir, if no crystals precipitate, add the C solution, add 10g of glycerol and continue to stir, check the pH value, the pH is 7.8- Between 8.0, an all-element biochemical chelated liquid water-soluble fertilizer of the present invention is produced, and the prepared all-element biochemical chelated liquid water-soluble fertilizer has a specific gravity of 1.35 to 1.38.

Period of use: full growth period of crops

Dosage and usage: 5-10KG/mu, flush application or drip irrigation.

Use this fertilizer 3-5 times throughout the growth period of the crop. Use this fertilizer during the seedling stage, transplanting period, flowering and fruit setting stage, and fruit expansion stage. Compared with the control, the crop yield increases by more than 20%, and the actual commercial rate reaches more than 96%.

Example 3:

(1) Add 150g of polyphosphoric acid into reactor A, add 250g of water and stir, slowly add 50g of potassium hydroxide, raise the temperature to 80 degrees, add 80g of urea into reactor A, stir and dissolve completely, and obtain a large amount of element solution A;

(2) In reactor B, add 20g of trace elements ferrous sulfate, 5g of copper sulfate, 5g of manganese sulfate, 25g of zinc sulfate, 20g of boric acid, and 1g of ammonium molybdate; add 180g of water and heat until completely dissolved. Add 15g of citric acid and ethylene glycol. To 60g of aminetetraacetic acid, add 30g of medium element magnesium sulfate heptahydrate, 50g of calcium formate, and 50g of citric acid, control the temperature at 85 degrees and stir for 40 minutes to obtain medium and trace element solution B;

(3) Add 250g of water to the C reactor, add 25g each of functional elements glycine, proline, glutamic acid, and alanine, 5g chitosan oligosaccharide, heat to 60 degrees, add 5g special element cobalt sulfate, and 5g organic silicon , stir and dissolve completely to obtain C solution.

(4) Add the trace element solution B obtained in the B reactor to the A reactor, continue to heat and stir, if no crystals precipitate, add the C solution, add 10g of glycerol and continue to stir, check the pH value, the pH is 5.5- Between 6.0, a total element biochemical chelated liquid water-soluble fertilizer of the present invention is produced, and the prepared total element biochemical chelated liquid water-soluble fertilizer has a specific gravity of 1.20 to 1.25.

Period of use: full growth period of crops

Dosage and usage: dilute 600-1000 times, spray on foliage or drip irrigation.

Use this fertilizer 3-5 times throughout the growth period of the crop, especially in extreme environments. The effect is better when used in the seedling stage, transplanting period, flowering and fruit setting stage, and fruit enlargement stage. The crop yield will increase by 18% compared with the control. % or more, and the actual product rate reaches more than 93%.

The following is a plot test of the all-element biochemical chelated liquid water-soluble fertilizer of the present invention on field cucumbers in 2021.

Through field experiments, the effect of spraying all-element biochemical chelated liquid water-soluble fertilizer on the growth, development and yield of cucumbers was examined, providing a basis for fertilizer registration and promotion application.

1 Time and place

1.1 Test time: May 2021-October 2021.

1.2 Test location: Zhao County Test Base of Shijiazhuang Academy of Agricultural and Forestry Sciences.

2 Materials and methods

2.1 Test soil: loam, flat terrain, good drainage and irrigation conditions, medium fertility, soil nutrients: organic matter 1.76%, water-alkali nitrogen 131mg/kg, available phosphorus 33.7mg/kg, available potassium 184mg/kg, pH 7.3.

2.2 Fertilizer for test: full-element biochemical chelated liquid water-soluble fertilizer (aqueous agent) provided by China National Seed Alliance Company, N+P2O5+K2O≥400g/L, Cu+Fe+Mn+Zn+B+Mo≥100g/L, Amino acid ≥20g/L.

2.3 Test variety: Xintai Miji.

2.4 Test method:

2.4.1 Experimental design: The experiment was designed with 3 treatments and 3 repetitions, with a total of 9 experimental plots. The plot area is 30 square meters. Each plot is randomly arranged and has a protection row.

2.4.2 Experimental treatment: 1: conventional fertilization + spraying of all-element biochemical chelated liquid water-soluble fertilizer; K2: conventional fertilization + spraying of equal amount of water; CK: conventional fertilization, blank control.

2.4.3 Fertilization method: ① Conventional fertilization: base fertilizer is decomposed manure 4500kg/acre, urea 25kg/acre, diammonium phosphate 25kg/acre, potassium chloride 10kg/acre; top dressing 2 times, each time applying 15kg ammonium bicarbonate/acre ; ② Spray full-element biochemical chelated liquid water-soluble fertilizer: Spray 3 times in total, in the vigorous period, pre-flowering period and melon period, each time spraying 100ml/acre (1:800 dilution); ③ Spray clean water: Spray a total of 3 times, the period is the same as the spraying of all-element biochemical chelated liquid water-soluble fertilizer, each spraying 15kg/acre; ④ Blank control: conventional fertilization.

3Results and analysis

3.1 Effects of different treatments on biological characteristics of cucumber

Tests have shown that plots sprayed with all-element biochemical chelated liquid water-soluble fertilizers have vigorous plant growth, developed root systems, strong plants, thick leaves, and dark green leaves; there are fewer ineffective flowers and deformed melons, and the ability to resist diseases and insect pests is stronger; melon strips Long, neat and bright green in color. According to experimental field observations, compared with K1, cucumbers flowered 1-2 days earlier, and the melon setting rate and single melon weight increased; compared with K1, plant diseases were reduced by about 9.8%.

3.2 Effects of different treatments on cucumber yield

Table 1 Test results 　　　kg/30m2

Table 2 Analysis of variance

Table 3 Multiple comparisons

The above data analysis shows that the differences between treatments are extremely significant, and the differences between blocks are not obvious. The output of K1 increased by 10.44% compared with K2 and by 12.59% compared with CK.

4 Test conclusion

The all-element biochemical chelated liquid water-soluble fertilizer developed by the present invention has a very obvious effect on increasing the yield of field cucumbers, improves cucumber quality, enhances cucumber stress resistance, etc., and can be demonstrated and promoted in large areas.

Claims (9)

1. A full-element biochemical chelating liquid water-soluble fertilizer is characterized in that: the water-soluble fertilizer comprises the following components in parts by weight: macroelements: 100-650 g/L of nitrogen, phosphorus and potassium; medium element: 5-30 g/L of calcium, 5-30 g/L of magnesium and 5-50 g/L of sulfur; trace elements: copper, iron, manganese, zinc, boron, molybdenum: 2-100 g/L; one or more of special elements of silicon, cobalt, iodine and strontium is selected according to different crops, and the weight ratio is as follows: 0.5-2 g/L of silicon, 0.5-2 g/L of cobalt, 0.5-2 g/L of iodine and 0.5-2 g/L of strontium; functional elements: one or more of humic acid, amino acid and organic acid, the weight ratio of which is: 2-80 g/L of humic acid, 2-100 g/L of amino acid, 5-30 g/L of chitosan oligosaccharide and 10-50 g/L of organic acid; synergistic element: 5-50 g/L of chelating agent and 5-50 g/L of wetting agent; the chelating agent is a mixture of three of ethylenediamine tetraacetic acid, glycine and organic acid or a mixture of four of iminodisuccinic acid, wherein the organic acid in the chelating agent is citric acid or propionic acid, and the weight ratio of the chelating agent is correspondingly formulated according to the content ratio of phosphorus element in a large amount of elements and metal element in a medium trace element, so that the sufficient chelation of the nutrient elements is required; the wetting agent is one or a mixture of more of propylene glycol, polyethylene glycol, glycerol, sorbitol, xylitol and mannitol.

2. The full-element biochemical chelation liquid water-soluble fertilizer according to claim 1, wherein: the macroelement nitrogen: phosphorus: the mass percentage of potassium is 1:3:2; the nitrogen precursor is one or a mixture of a plurality of urea, ammonium sulfate and dimethylurea; the phosphorus precursor is one or a mixture of more of polyphosphoric acid, potassium polyphosphate and phosphorous acid; the precursor of potassium is one or a mixture of several of potassium hydroxide, potassium dihydrogen phosphate or dipotassium hydrogen phosphate and potassium carbonate.

3. The full-element biochemical chelation liquid water-soluble fertilizer according to claim 1, wherein: the mass percentage of the medium elements of calcium, magnesium and sulfur is 5:25:20, a step of; the precursor of the calcium is one or a mixture of more of calcium chloride, calcium nitrate and calcium formate; the magnesium precursor is one or a mixture of more of magnesium sulfate and magnesium chloride; the sulfur precursor is one or a mixture of more of potassium sulfate, magnesium sulfate, zinc sulfate and copper sulfate.

4. The full-element biochemical chelation liquid water-soluble fertilizer according to claim 1, wherein: the mass percentage of the microelements copper, iron, manganese, zinc, boron and molybdenum is 1.5:1:2.5:3.5:1.4:1, a step of; the precursor of the trace element is ferrous sulfate, copper sulfate, manganese sulfate, zinc oxide, boric acid, tetrahydrate octaboron or ammonium molybdate.

5. The full-element biochemical chelation liquid water-soluble fertilizer according to claim 1, wherein: the precursor of the special element silicon is silicone oil or organic silicon; the precursor of cobalt is cobalt sulfate; the iodine precursor is potassium iodate or potassium iodide; the strontium precursor is strontium carbonate or strontium sulfate; the special elements are selected according to different crops.

6. The full-element biochemical chelation liquid water-soluble fertilizer according to claim 1, wherein: the precursor of the functional element humic acid is one or a mixture of more of potassium fulvate, biochemical fulvic acid, brown humic acid and potassium fulvate; the precursor of the amino acid is; one or a mixture of more of glycine, proline, glutamic acid, lysine, alanine, threonine and polyaspartic acid; the precursor of the chitosan oligosaccharide is amino acid oligosaccharin; the precursor of the organic acid is one or a mixture of more of citric acid, polyglutamic acid, formic acid, acetic acid and salicylic acid.

7. The full-element biochemical chelation liquid water-soluble fertilizer according to claim 1, wherein: the chelating agent is used in the order and the amount of the chelating agent are more or less that ethylenediamine tetraacetic acid > citric acid and glycine > iminodisuccinic acid.

8. The method for preparing the full-element biochemical chelating liquid water-soluble fertilizer according to claim 1, which is characterized in that: the method comprises the following steps:

step one: adding polyphosphoric acid and phosphorous acid into the reaction kettle A, then adding water, slowly stirring, slowly adding potassium hydroxide to gradually increase the temperature to 70-80 ℃, gradually adding urea, dipotassium hydrogen phosphate and the like, and continuously stirring until the urea, the dipotassium hydrogen phosphate and the like are completely dissolved to obtain a macroelement stock solution A;

step two: adding deionized water into the reaction kettle B, and then adding medium elements of calcium and magnesium in corresponding proportions; the microelements copper, iron, manganese, zinc, molybdenum and the like and the special elements cobalt and strontium can be selected according to the needs of crops, the mixture is heated to 80 ℃ to be completely dissolved, and chelating agents are added: mixing and stirring ethylenediamine tetraacetic acid and organic acid, chelating for 40-50 minutes, and obtaining solution B containing medium, trace and special elements after liquid permeation;

step three: adding deionized water into a reaction kettle C, heating to 60-70 ℃, adding functional elements humic acid, amino acid, organic acid and chitosan oligosaccharide according to a proportion, adding boron, selecting special elements such as organic silicon and iodine according to the needs of crops, and obtaining a solution C containing the functional elements and the special elements after complete dissolution and transparent;

step four: adding the medium trace element solution B obtained in the reaction kettle B into the reaction kettle A, continuously heating and stirring, adding the solution C without precipitating crystals, and adding a synergistic element wetting agent, such as: adding propylene glycol and polyethylene glycol in equal proportion by weight for constant volume, continuously stirring, discharging bubbles, continuously constant volume, detecting the PH value, and obtaining the full-element biochemical chelating liquid water-soluble fertilizer, wherein the PH value is between 4 and 9; the specific gravity of the prepared liquid water-soluble fertilizer is 1.25-1.7.

9. The method for preparing the full-element biochemical chelation liquid water-soluble fertilizer according to claim 8, which is characterized in that: the types of the special elements are selected according to crops, and during processing, two special elements of cobalt and strontium are added in the second step and chelated by a chelating agent, and the special elements of silicon and iodine are added in the third step by adopting organic silicon and iodine.