Method for preparing water-soluble fertilizer by combining glutamic acid extracting solution with humic acid and product thereof

Abstract

The invention provides a method for preparing a water-soluble fertilizer by combining a glutamic acid extracting solution with humic acid and a product thereof, and belongs to the technical field of fertilizer preparation, and the method comprises the following steps: a pretreatment step of injecting water into the glutamic acid extracting solution and adjusting the pH value to obtain a diluted glutamic acid extracting solution; a mixing step of adding mineral source water-soluble humate into the diluted glutamic acid extracting solution to obtain a mixed material solution; a multi-element adding step of adding macroelement fertilizer raw materials and chelated medium trace element nutrients into the mixed feed liquid to obtain a multi-element feed liquid; and a post-treatment step of standing and filtering the multi-element feed liquid to obtain a supernatant which is a water-soluble fertilizer product. According to the method, the glutamic acid extracting solution and the mineral source water-soluble humate are used as main raw materials to prepare a novel water-soluble fertilizer product, the requirement of various crops for fertilizer can be met, a novel water-soluble fertilizer production process is provided, a novel utilization method of the glutamic acid extracting solution is further provided, and the production cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizer preparation, and in particular to a method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid and a product thereof. Background Art

[0002] Glutamic acid extract is the tail liquid produced after extracting glutamate products in the glutamate industrial production process. It is rich in various free amino acids and also contains a large amount of nitrogen, sulfur, organic matter, amino acids, phosphorus, potassium and trace elements. Because it contains a large amount of ammonium sulfate nitrogen and organic matter, it will pollute the environment if it flows into rivers. However, its biochemical treatment is difficult and the treatment cost is high. Therefore, the effective treatment of glutamate extract has always been the main obstacle to the sustainable development of glutamate production enterprises.

[0003] Humic acid is a type of organic matter that is formed and accumulated through the decomposition and transformation of animal and plant remains (mainly plant remains) by microorganisms and a series of geochemical processes. It is a macromolecular organic substance that is widely present in nature. The basic structure of humic acid macromolecules is aromatic rings and alicyclic rings, with carboxyl, hydroxyl, carbonyl, quinone, methoxy and other functional groups attached to the rings. It can be widely used in agriculture, forestry, animal husbandry, petroleum, chemical industry, building materials, medicine and health, environmental protection and other fields. Especially now that ecological agriculture construction, pollution-free agricultural production, green food, pollution-free environmental protection, etc. are advocated, humic acid is highly respected.

[0004] China has rich humic acid resources, large reserves, wide distribution, and good quality, which have played a huge role in agricultural production. Including: 1. Stimulate the growth of crop roots, the number and length of rhizomes have increased significantly, and it can also regulate the absorption rate of crops to other substances including nitrates, and promote the absorption of nutrients by crop roots. 2. Improve the stress resistance of crops, and play an antioxidant role by adjusting the growth environment and external morphology of crops, thereby weakening the impact of external adverse factors on crops and improving crop stress resistance. 3. Promote the conversion of fertilizers and soil nutrients, improve fertilizer utilization, and promote crop growth. 4. The use of humic acid in the early stage of crop growth will slow down the activity of urea, and in the later stage it will steadily increase the activity of urea, providing a richer nutrient supply for crop growth and increasing yields.

[0005] Water-soluble fertilizers are playing an increasingly important role in modern agriculture and water-saving agriculture. Water-soluble fertilizers containing humic acid as the main active ingredient are also an important category. They are suitable for modern agricultural water and fertilizer facilities such as drip irrigation, micro-irrigation, and sprinkler irrigation to improve fertilizer utilization. Therefore, introducing glutamic acid extract and humic acid as raw materials in water-soluble fertilizers and providing relevant preparation methods can provide new water-soluble fertilizers for agricultural planting and production, and also provide a new utilization path for glutamic acid extracts, which is of great significance. Summary of the invention

[0006] The present invention provides a method and product of preparing water-soluble fertilizer by combining glutamic acid extract with humic acid, which has simple process, low production cost, dual functions of organic / inorganic fertilizer, promotes germination and rooting of crop seeds, and improves crop yield, and is used to solve the problem of treatment of glutamic acid extract and pollution to the environment.

[0007] To achieve the above-mentioned purpose, the present invention provides a method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid, comprising: a pretreatment step of injecting water into the glutamic acid extract and adjusting the pH value to obtain a diluted glutamic acid extract; a mixing step of adding mineral-source water-soluble humate to the diluted glutamic acid extract to obtain a mixed liquid; a multi-element adding step of adding macro-element fertilizer raw materials and chelated trace element nutrients to the mixed liquid to obtain a multi-element liquid; and a post-treatment step of allowing the multi-element liquid to stand and filter to obtain a supernatant, wherein the supernatant is the water-soluble fertilizer product.

[0008] The method uses glutamic acid extract and mineral water-soluble humate as main raw materials to prepare a new water-soluble fertilizer product, which can meet the fertilizer needs of various crops. It not only provides a new water-soluble fertilizer production process, but also effectively utilizes glutamic acid extract, provides a new utilization method of glutamic acid extract, solves the problem of glutamic acid extract treatment and environmental pollution, improves the commercial value of glutamic acid extract, and has a simple production process and low production cost.

[0009] Furthermore, the operation of the pretreatment step is as follows: inject 5-20 times the amount of deionized water into the glutamic acid extract, and then use an alkaline raw material to adjust the pH value of the glutamic acid extract to 4.5-7.5 to obtain a diluted glutamic acid extract.

[0010] Furthermore, the alkaline raw material is one or more of sodium hydroxide, potassium hydroxide, liquid ammonia and ammonia water.

[0011] Preferably, the alkaline raw material is one or both of potassium hydroxide and ammonia water. Because the potassium and nitrogen elements in potassium hydroxide and ammonia water are elements required for plant growth, the nutrient element ratio of potassium and / or nitrogen in the water-soluble fertilizer product can be adjusted by adding potassium hydroxide and / or ammonia water.

[0012] Glutamic acid extract is acidic, and its pH value is relatively low, usually between 2.5 and 3.5. Deionized water and alkaline raw materials are added to the glutamate extract to adjust its pH value, so that it can be easily mixed with various subsequent raw materials. The nitrogen, sulfur, organic matter, and amino acids contained in the glutamate extract are necessary substances for the growth and development of crops and for fertilizing the soil. The use of glutamate extract in fertilizers can improve the physical and chemical properties of the soil, improve its water and fertilizer retention capacity and air permeability, and play a role in maintaining, maturing, and improving the soil. At the same time, it can improve the stress resistance of crops, thereby increasing the yield and quality of crops. Moreover, the use of glutamate extract in the preparation of fertilizers makes full use of waste, solves the problems of environmental pollution and garbage harmlessness, and provides suitable biomass for the production of fertilizers.

[0013] Furthermore, the operation of the mixing step is as follows: the diluted glutamic acid extract is heated to 30-80°C, mineral-source water-soluble humate is slowly added, and then stirred to fully dissolve to obtain a mixed liquid. Mineral-source water-soluble humate is derived from weathered coal, lignite or peat, is usually alkaline, and has good water solubility. Using it as a base fertilizer can improve soil structure, increase soil fertility, promote crop growth, and reduce the use of chemical fertilizers. When it is used as a water-soluble fertilizer for foliar spraying, it can increase the chlorophyll content of crops, promote root development, enhance photosynthesis, improve crop stress resistance, and improve product quality.

[0014] Furthermore, the usage amount of the mineral source water-soluble humate is 0.2-3 times of the glutamic acid extract; the mineral source water-soluble humate is one or both of potassium humate and sodium humate.

[0015] Preferably, the mineral-source water-soluble humate is a mixture of potassium humate and sodium humate, wherein potassium humate accounts for 80-100% of the total amount of the humate raw material, and sodium humate accounts for 0-20% of the total amount of the humate raw material. The ratio of potassium salt to sodium salt in the mineral-source water-soluble humate can be adjusted according to the demand for nutrients of different crops.

[0016] Furthermore, the multi-element adding step is as follows: adding a large amount of element fertilizer raw materials to the mixed liquid, stirring and dissolving at 30-80°C, then adding chelated trace element nutrients, stirring and dissolving, and then continuing to stir at 30-80°C for 3-15 hours, stopping stirring, and obtaining a multi-element liquid. Glutamic acid extract and mineral source water-soluble humate are mostly organic matter. Adding a large amount of element fertilizer raw materials and chelated trace element nutrients to them combines inorganic mineral elements with organic matter, which can provide more necessary element nutrients for plant growth and facilitate the regulation of plant growth.

[0017] Furthermore, the macronutrient fertilizer raw materials include nitrogen, phosphorus and potassium, wherein the ratio of nitrogen, phosphorus and potassium is 1:(0.5-1.5):(0.3-1.5). In addition to the nitrogen, phosphorus and potassium elements provided by the alkaline raw materials and humic acid, water-soluble fertilizers may also contain additional nutrient elements, especially nitrogen, phosphorus and potassium elements that are indispensable for the growth of crops, wherein the sources of nitrogen, phosphorus and potassium elements include but are not limited to: urea, ammonium sulfate, ammonium nitrate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, potassium sulfate, potassium chloride, potassium nitrate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, ammonium polyphosphate, etc.

[0018] Furthermore, the chelated trace element nutrients include silicon, calcium, magnesium, sulfur, copper, iron, manganese, zinc, boron, and molybdenum. The sources of each element include, but are not limited to, potassium silicate, EDTA-Mg, EDTA-Ca, potassium sulfate, sodium sulfate, ammonium sulfate, EDTA-Cu, EDTA-Mn, EDTA-Fe, EDTA-Zn, boric acid, borax, ammonium molybdate, sodium molybdate, etc. The absorption and utilization efficiency of chelated trace elements is better than that of inorganic ones. In production, while taking into account the cost, as many chelated trace elements as possible can be added, and the mixing of different chelated elements will not produce antagonistic effects, and the use effect is good.

[0019] Furthermore, the operation of the post-processing step is as follows: the multi-element liquid is allowed to stand and cool naturally, and after 5-36 hours, it is filtered through a 100-400 mesh sieve, and the resulting supernatant is a liquid dosage form water-soluble fertilizer product. After the multi-element liquid is fully dissolved, in order to enhance the solubility of the water-soluble fertilizer, the undissolved raw materials are screened out, and the resulting liquid dosage form water-soluble fertilizer product can be more conveniently and quickly diluted and dissolved during the application process.

[0020] Furthermore, the method further comprises a granulation step; the operation of the granulation step is as follows: the liquid dosage form water-soluble fertilizer product is subjected to spray granulation to obtain a granular dosage form water-soluble fertilizer product. The spray granulation is a common technical means in the art, and its process parameters are conventionally selected by those skilled in the art and are not limited here.

[0021] The liquid and granular water-soluble fertilizer products prepared by the present invention have simple preparation processes, are rich in various organic matters, macroelements and medium and trace elements, and have elements in a slow-release state and a chelated state, and have certain slow-release properties. After application, they can significantly increase the organic matter content in the soil, improve the soil structure, improve the soil's water-retaining and fertilizer-raising properties, regulate plant growth, and thus increase crop yields and improve the quality of agricultural products.

[0022] Furthermore, the water-soluble fertilizer product can be used in various cultivation methods such as hydroponics and soil cultivation. Similarly, the water-soluble fertilizer product can be applied by pouring, sprinkling or irrigation equipment.

[0023] Preferably, during application, the amount of each acre of the water-soluble fertilizer product is 5-40 kilograms, and the dilution multiple is 3000-25000 times. Water-soluble fertilizer products are usually diluted and used, and even if the water-soluble fertilizer products of the present invention are diluted more than 3000 times, the growth of the whole crop is significantly promoted, and both the aboveground part and the root are significantly increased. When actually applied, its consumption is adjusted by those skilled in the art according to the demand of different crops (such as vegetables, solanaceous fruits, fruit trees, flowers, medicinal materials, field crops, and the consumption of these types is not uniform), can be used for soil irrigation, allowing plant roots to be fully exposed to fertilizer, can also be used for foliar spraying, enter plant interior through leaf pores, improve fertilizer absorption and utilization rate, can also carry out drip irrigation and soilless cultivation, save irrigation water and improve labor efficiency.

[0024] Furthermore, the water-soluble fertilizer product is suitable for a variety of crops, including but not limited to wheat, rice, corn, rapeseed, soybean, green vegetables, cabbage, apple, pear, peach, ginseng, angelica, etc. The water-soluble fertilizer product can be used as base fertilizer and / or topdressing. When used as base fertilizer, it is generally applied before planting crops, and when used as topdressing, it can be applied from the seedling stage to the maturity stage of crops.

[0025] The present invention also provides a water-soluble fertilizer product, which is prepared by the method for preparing water-soluble fertilizer by combining the aforementioned glutamic acid extract with humic acid. In the water-soluble fertilizer product, the humic acid content is 20-100 g / L, the free amino acid content is 4-30 g / L, the macro-element content is 50-300 g / L, and the trace element content is 2-50 g / L.

[0026] The water-soluble fertilizer product provided by the present invention is comprehensive and rich in nutrition, has the characteristics of high utilization rate, good absorption, complete nutrients, and slow-release fertilizer effect, and has the dual functions of organic / inorganic fertilizers. It can accelerate the speed of breaking dormancy of seeds, promote the rapid growth of crop roots, and enhance the photosynthesis of crops. At the same time, it can effectively improve the physical and chemical conditions and biological characteristics of the soil, enhance the soil's fertilizer retention and supply capacity and buffering capacity, increase the yield and quality of crops, and significantly reduce the production cost of crops.

[0027] The method for preparing water-soluble fertilizer by combining glutamic acid extract and humic acid and the product thereof provided by the present invention use glutamic acid extract and mineral source water-soluble humate as main raw materials to prepare a new water-soluble fertilizer product, which can meet the fertilizer demand of various crops, not only provides a new water-soluble fertilizer production process, but also effectively utilizes glutamic acid extract, provides a new utilization method of glutamic acid extract, solves the problem of glutamic acid extract treatment and environmental pollution, realizes the harmlessness of glutamic acid extract, improves the commercial value of glutamic acid extract, and has a simple production process and low production cost.

[0028] In addition to supplying nutrients, the organic matter in this water-soluble fertilizer product can also increase the soil's buffering performance and adsorption capacity, and improve the soil's physical and chemical properties through adsorption, complexation, reduction, volatilization and other effects, increase its water and fertilizer retention capacity and air permeability, and play a role in maintaining, maturing and improving the soil. At the same time, it can improve the crop's resistance to stress, thereby increasing crop yield and quality.

[0029] The preparation method of the water-soluble fertilizer makes full use of industrial waste, improves the environment while reducing the cost of raw materials, and does not generate secondary pollution during the preparation process. The water-soluble fertilizer product can be used in various cultivation methods such as hydroponics and soil cultivation, can be applied by pouring, sprinkling or irrigation equipment, and is suitable for a variety of crops. It can be used as base fertilizer and / or topdressing, has a simple method of use, is easy to implement and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 Comparison chart of germination of wheat grown in sandy soil;

[0032] Figure 2 This is a comparison chart of hydroponic wheat germination. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present invention.

[0034] The following examples use conventional instruments and equipment in the art. Unless otherwise specified, the test materials and reagents used in the following examples can be obtained from commercial sources, and their specifications are conventional specifications in the art. If no specific techniques or conditions are specified in the following examples, they can be carried out according to the techniques or conditions described in the literature in the art or according to the product instructions.

[0035] It should be noted that, in the present invention and the following embodiments, concentrations, ratios, etc. not otherwise specified are all weight concentrations, weight ratios, etc., "%" means weight percentage, and "parts" means parts by weight, which are common writing habits used by those skilled in the art and are therefore not described in detail in the present invention.

[0036] As a preferred embodiment, a method for preparing a water-soluble fertilizer by combining a glutamic acid extract with humic acid of the present invention specifically comprises the following steps:

[0037] 1) Pretreatment: inject 5-20 times the amount of deionized water into the glutamic acid extract, and then use an alkaline raw material to adjust the pH value of the glutamic acid extract to 4.5-7.5 to obtain a diluted glutamic acid extract.

[0038] Further, the alkaline raw material is one or more of sodium hydroxide, potassium hydroxide, liquid ammonia and ammonia water. Preferably, the alkaline raw material is one or two of potassium hydroxide and ammonia water.

[0039] 2) Mixing: Heat the diluted glutamic acid extract to 30-80°C, slowly add the mineral source water-soluble humate, and then stir to fully dissolve to obtain a mixed liquid.

[0040] Furthermore, the usage amount of the mineral source water-soluble humate is 0.2-3 times of the glutamic acid extract; the mineral source water-soluble humate is one or both of potassium humate and sodium humate.

[0041] Preferably, the mineral-source water-soluble humate is a mixture of potassium humate and sodium humate, wherein potassium humate accounts for 80-100% of the total amount of the humate raw material, and sodium humate accounts for 0-20% of the total amount of the humate raw material.

[0042] 3) Multi-element addition: Add macro-element fertilizer raw materials to the mixed liquid, stir and dissolve them at 30-80°C, then add chelated trace element nutrients, stir and dissolve them, then continue stirring at 30-80°C for 3-15 hours, stop stirring, and obtain a multi-element liquid.

[0043] Furthermore, the macro-element fertilizer raw materials include nitrogen, phosphorus and potassium, wherein the ratio of nitrogen, phosphorus and potassium is 1:(0.5-1.5):(0.3-1.5).

[0044] Furthermore, the chelated trace element nutrients include silicon, calcium, magnesium, sulfur, copper, iron, manganese, zinc, boron, and molybdenum.

[0045] 4) Post-treatment: The multi-element liquid is allowed to stand and cool naturally. After 5-36 hours, it is filtered through a 100-400 mesh sieve. The obtained supernatant is a water-soluble fertilizer product in liquid dosage form.

[0046] In another preferred embodiment, the method for preparing a granular water-soluble fertilizer by combining a glutamic acid extract with humic acid of the present invention further comprises the following steps:

[0047] 5) Granulation: The liquid dosage form of the water-soluble fertilizer product is subjected to spray granulation to obtain a granular dosage form of the water-soluble fertilizer product.

[0048] As an improvement to the above implementation, 0.1-0.5% potassium tartrate and 0.3-1.0% ammonium citrate are added to the deionized water in the pretreatment step. In addition to providing organic salts of potassium and nitrogen elements, potassium tartrate and ammonium citrate can also form an ion bridge between the glutamate extract and the soil after being applied to the soil. The ion bridge promotes the absorption and utilization of various organic matter in the glutamate extract by the root system of crops, thereby improving the yield and quality of crops. The acidic groups in the glutamate extract and the glutamate extract can activate and release metal ions in the soil, thereby improving their absorption and utilization rate. The alkali resistance of crops can also be enhanced, making crops more adaptable to alkaline salt environments and improving the salt-alkali resistance of crops.

[0049] Preferably, the present invention also provides use of the above-mentioned water-soluble fertilizer product in improving saline-alkali land.

[0050] It should be noted that glutamic acid extract is a product produced by the enterprise itself or sold on the market.

[0051] In the following examples, the proportions of the trace elements in the chelated nutrients are: silicon 19.5%, calcium 22.5%, magnesium 17%, sulfur 4%, copper 8.5%, iron 6.5%, manganese 4.5%, zinc 6.5%, boron 5.5%, molybdenum 5.5%, totaling 100%. However, the proportions of the above elements are only examples of the application of the embodiments. In actual production, those skilled in the art can adjust according to the needs of crops and soil, without being limited by the above examples.

[0052] The present invention is further described in detail below in conjunction with the examples. However, it should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0053] Embodiment 1:

[0054] A method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid comprises the following steps:

[0055] 1) Pretreatment: inject 5 times the amount of deionized water into the glutamic acid extract, and then use the alkaline raw material - sodium hydroxide to adjust the pH value of the glutamic acid extract to 4.5 to obtain a diluted glutamic acid extract.

[0056] 2) Mixing: Heat the diluted glutamic acid extract to 30°C, slowly add the mineral-source water-soluble humate, and then stir to fully dissolve to obtain a mixed liquid. The amount of mineral-source water-soluble humate used is 0.5 times that of the glutamic acid extract; the mineral-source water-soluble humate is potassium humate.

[0057] 3) Multi-element addition: Add macro-element fertilizer raw materials to the mixed liquid, stir thoroughly to dissolve at 30°C, then add chelated trace element nutrients, stir thoroughly to dissolve, then continue stirring at 30°C for 15 hours, stop stirring, and obtain a multi-element liquid.

[0058] Furthermore, the macronutrient fertilizer raw materials include nitrogen, phosphorus and potassium, wherein the ratio of nitrogen, phosphorus and potassium is 1:0.5:0.3. The chelated micronutrients include silicon, calcium, magnesium, sulfur, copper, iron, manganese, zinc, boron and molybdenum.

[0059] 4) Post-treatment: The multi-element liquid is allowed to stand and cool naturally. After 5 hours, it is filtered through a 100-400 mesh sieve. The obtained supernatant is a water-soluble fertilizer product in liquid dosage form.

[0060] Embodiment 2:

[0061] A method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid comprises the following steps:

[0062] 1) Pretreatment: inject 20 times the amount of deionized water into the glutamic acid extract, and then use the alkaline raw material-ammonia water to adjust the pH value of the glutamic acid extract to 7.5 to obtain a diluted glutamic acid extract.

[0063] 2) Mixing: Heat the diluted glutamic acid extract to 80°C, slowly add the mineral-source water-soluble humate, and then stir to fully dissolve to obtain a mixed liquid. The amount of mineral-source water-soluble humate used is 3 times that of the glutamic acid extract; the mineral-source water-soluble humate is sodium humate.

[0064] 3) Multi-element addition: Add macro-element fertilizer raw materials to the mixed liquid, stir thoroughly to dissolve at 80°C, then add chelated trace element nutrients, stir thoroughly to dissolve, then continue stirring at 80°C for 3 hours, stop stirring, and obtain a multi-element liquid.

[0065] Furthermore, the macronutrient fertilizer raw materials include nitrogen, phosphorus and potassium, wherein the ratio of nitrogen, phosphorus and potassium is 1:1.5:1.5. The chelated micronutrients include silicon, calcium, magnesium, sulfur, copper, iron, manganese, zinc, boron and molybdenum.

[0066] 4) Post-treatment: The multi-element liquid is allowed to stand and cool naturally. After 36 hours, it is filtered through a 100-400 mesh sieve. The obtained supernatant is a water-soluble fertilizer product in liquid dosage form.

[0067] Embodiment 3:

[0068] A method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid comprises the following steps:

[0069] 1) Pretreatment: inject 10 times the amount of deionized water into the glutamic acid extract, and then adjust the pH value of the glutamic acid extract to 6.5 using an alkaline raw material to obtain a diluted glutamic acid extract. The alkaline raw material is a mixture of potassium hydroxide and ammonia water in a weight ratio of 1:1.

[0070] 2) Mixing: Heat the diluted glutamic acid extract to 65°C, slowly add the mineral-source water-soluble humate, and then stir to fully dissolve to obtain a mixed liquid. The amount of mineral-source water-soluble humate used is 1.5 times that of the glutamic acid extract; the mineral-source water-soluble humate is a mixture of potassium humate and sodium humate, wherein potassium humate accounts for 85% of the total amount of the humate raw material, and sodium humate accounts for 15% of the total amount of the humate raw material.

[0071] 3) Multi-element addition: Add macro-element fertilizer raw materials to the mixed liquid, stir thoroughly to dissolve at 65°C, then add chelated trace element nutrients, stir thoroughly to dissolve, then continue stirring at 65°C for 7 hours, stop stirring, and obtain a multi-element liquid.

[0072] Furthermore, the macronutrient fertilizer raw materials include nitrogen, phosphorus and potassium, wherein the ratio of nitrogen, phosphorus and potassium is 1:1.2:0.5. The chelated micronutrients include silicon, calcium, magnesium, sulfur, copper, iron, manganese, zinc, boron and molybdenum.

[0073] 4) Post-treatment: The multi-element liquid is allowed to stand and cool naturally. After 16 hours, it is filtered through a 100-400 mesh sieve. The obtained supernatant is a water-soluble fertilizer product in liquid dosage form.

[0074] Embodiment 4:

[0075] A method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid, based on Example 3, further comprising the following steps:

[0076] 5) Granulation: The liquid dosage form of the water-soluble fertilizer product is subjected to spray granulation to obtain a granular dosage form of the water-soluble fertilizer product.

[0077] Embodiment 5:

[0078] A method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid is based on Example 3, except that the following steps are performed:

[0079] 1) Pretreatment: 10 times the amount of deionized water is injected into the glutamic acid extract, and then the pH value of the glutamic acid extract is adjusted to 6.5 using an alkaline raw material to obtain a diluted glutamic acid extract. The alkaline raw material is a mixture of potassium hydroxide and ammonia water in a weight ratio of 1:1. 0.35% potassium tartrate and 0.45% ammonium citrate are added to the above deionized water.

[0080] Comparative Example 1:

[0081] A method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid, which is different from Example 3 in that:

[0082] 1) Deionized water is heated to 65°C, and mineral-source water-soluble humate is slowly added thereto, and then stirred to fully dissolve to obtain a mixed liquid.

[0083] The usage ratio of mineral source water-soluble humate to deionized water is 1.5:10; the mineral source water-soluble humate is a mixture of potassium humate and sodium humate, wherein potassium humate accounts for 85% of the total amount of humate raw materials, and sodium humate accounts for 15% of the total amount of humate raw materials.

[0084] 2), which is consistent with step 3) in Example 3.

[0085] 3), which is consistent with step 4) in Example 3. That is, the water-soluble fertilizer product of this comparative example does not contain glutamic acid extract raw material.

[0086] Comparative Example 2:

[0087] A method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid is based on Example 3, except that the following steps are performed:

[0088] 1) Pretreatment: 10 times the amount of deionized water is injected into the glutamic acid extract, and then the pH value of the glutamic acid extract is adjusted to 6.5 using an alkaline raw material to obtain a diluted glutamic acid extract. The alkaline raw material is a mixture of potassium hydroxide and ammonia water in a weight ratio of 1:1. 0.8% potassium tartrate is added to the above deionized water.

[0089] Comparative Example 3:

[0090] A method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid is based on Example 3, except that the following steps are performed:

[0091] 1) Pretreatment: 10 times the amount of deionized water is injected into the glutamic acid extract, and then the pH value of the glutamic acid extract is adjusted to 6.5 using an alkaline raw material to obtain a diluted glutamic acid extract. The alkaline raw material is a mixture of potassium hydroxide and ammonia water in a weight ratio of 1:1. 0.8% ammonium citrate is added to the deionized water.

[0092] Test Example 1:

[0093] Wheat germination experiment: The tested wheat variety is Tai 714. The water-soluble fertilizer adopts the water-soluble fertilizer product prepared in Example 3, which is diluted and applied. Seeds with basically the same appearance are taken for cultivation. They are first germinated in warm water, and then seeds with consistent germination potential are selected and planted in sandy soil collected from the same batch and the same area. The sandy soil is poured with equal amounts of clean water (blank group), 5000 times (test group 1), 10000 times (test group 2) and 20000 times (test group 3) dilutions. After culturing at 25°C for 7 days, the wheat seedlings are taken out and their growth is observed. Each test case is set up with 3 parallels, and the average value is taken. Its growth and development is shown in the figure. Figure 1 And as shown in Table 1.

[0094] Table 1

[0095] Blank Group Experimental Group 1 Experimental Group 2 Experimental Group 3 Above ground length / mm 13.3 16.3 18.2 17.1 Root length / mm 10.2 12.5 14.3 13.7

[0096] Figure 1 This is a comparison chart of wheat germination in sandy soil. Figure 1 As shown in the results of Table 1, the water-soluble fertilizer product of Example 3 has a significant enhancing effect on the growth of wheat planted in sandy soil, and has a significant promoting effect on the growth of the entire plant. The growth conditions of the aboveground parts and roots of each test group are significantly better than those of the blank control.

[0097] Test Example 2:

[0098] Wheat germination experiment: The tested wheat variety is Jinghua 11. The water-soluble fertilizer adopts the water-soluble fertilizer product prepared in Example 3, which is diluted and applied. Seeds with basically the same appearance are taken for cultivation. They are first germinated in warm water, and then seeds with consistent germination potential are selected. They are placed in planting baskets for hydroponics. The liquid just immerses the seeds. The hydroponic liquid is diluted with an equal amount of clean water (blank group 1 and blank group 2), 5000 times (test group 1 and test group 2), 10000 times (test group 3) and 20000 times (test group 4). After culturing at 25°C for 7 days, the wheat seedlings are taken out and their growth is observed. Its growth and development are shown in the figure. Figure 2 And as shown in Table 2.

[0099] Table 2

[0100]

[0101]

[0102] Figure 2 This is a comparison chart of hydroponic wheat germination. Figure 2From the results in Table 2, it can be seen that the water-soluble fertilizer product of Example 3 has a significant enhancing effect on the growth of hydroponic wheat, and various dilutions have a significant promoting effect on the growth of the entire plant. The growth conditions of the aboveground part and roots of each test group are significantly better than those of the blank control, and the water-soluble fertilizer product has a more significant growth-promoting effect on the root system.

[0103] Test Example 3:

[0104] Field test: The test was conducted in Linfen City, Shanxi Province. Before the test, 0-20cm tillage layer soil was collected for nutrient testing: the average organic matter content was 16.8g / kg, total nitrogen was 1.03g / kg, available phosphorus was 10.2mg / kg, available potassium was 78mg / kg, pH was 6.5. The land was flat, with convenient transportation, drainage and irrigation, and medium fertility. The wheat variety for the test was Jinmai 919. The test was set up with 3 treatments and 3 replications. Randomized block design, the area of ​​the plot was 45m 2 , 9m×5m, with a 0.5m wide isolation zone between plots to prevent cross-spraying between treatments. Except for the experimental fertilization treatment method, the field cultivation management measures remained consistent.

[0105] Test group: 30kg / mu of water-soluble fertilizer products of Example 3-Example 5 and Comparative Example 1-Comparative Example 3 were applied as basal fertilizer and 15kg / mu was applied as topdressing in the later stage. Control group: 30kg / mu of ordinary urea (46%) was applied as basal fertilizer and 15kg / mu was applied as topdressing in the later stage. Blank group: 30kg / mu of clean water was applied as basal fertilizer and 15kg / mu was applied as topdressing in the later stage. According to the five-point sampling method, plant height and effective ear number were investigated, ear length, number of grains per ear, thousand-grain weight, etc. were measured at the harvest period, and each plot was cut, dried and weighed separately to calculate the yield per unit area. The results are shown in Tables 3 and 4.

[0106] Table 3 Comparison of wheat agronomic traits and yield

[0107] Plant heightcm Spike length cm Number of grains per ear (grains / ear) Thousand grain weight g Yield per mu (kg / mu) Blank Group 65.3 6.7 32.4 45.3 549.3 Control group 79.3 7.7 36.4 49.3 616.3 Example 3 82.3 8.3 39.7 52.3 633.4 Example 4 81.4 8.4 38.5 52.7 631.7 Example 5 85.4 8.7 41.3 54.7 653.2 Comparative Example 1 80.3 7.5 37.2 48.7 608.3 Comparative Example 2 83.2 8.4 38.9 52.9 634.5 Comparative Example 3 83.4 8.5 40.3 53.2 640.2

[0108] Table 4 Wheat quality test results

[0109] Protein (g / 100g) hardness Blank Group 8.2 65.3 Control group 9.4 67.2 Example 3 10.6 69.6 Example 4 10.4 69.8 Example 5 11.3 70.3 Comparative Example 1 9.2 68.4 Comparative Example 2 10.3 69.9 Comparative Example 3 10.9 70.1

[0110] It can be seen from the results of Table 3 and Table 4 that, compared with ordinary urea and water-soluble fertilizer products without glutamic acid extract, the water-soluble fertilizer products containing glutamic acid extract in the present invention and the embodiments have a more significant effect on promoting the growth of wheat, can promote wheat tillering, increase the number of effective ears and thousand-grain weight, significantly improve the yield traits of wheat, and improve the production factors of wheat, thereby significantly promoting the increase in yield, with obvious yield-increasing effects, and can also significantly improve the quality of wheat.

[0111] Test example 4:

[0112] Wheat seedling growth test in saline-alkali environment: Test wheat variety: Jinghua 11, water-soluble fertilizer using Example 3, Example 5 and Comparative Example 1, Comparative Example 2 prepared water-soluble fertilizer products, diluted 5000 times before application. Take seeds with basically the same appearance for cultivation, first germinate in warm water, then select seeds with consistent germination potential, put them into planting baskets for hydroponics, the liquid just immerses the seeds, add Na2CO3 with a concentration of 5mmol / L to the hydroponic nutrient solution, and apply the same amount of water-soluble fertilizer dilution solution of each experimental group to the hydroponic solution at the same time. After culturing at 25°C for 7 days, take out the wheat seedlings and observe their growth. Its growth and development is shown in Table 5.

[0113] Table 5

[0114] Example 3 Example 5 Comparative Example 1 Comparative Example 2 Above ground length / mm 16.2 18.4 16.7 17.3 Root length / mm 10.5 14.2 11.4 13.7

[0115] As can be seen from Table 5, under the saline-alkali stress environment, the growth of wheat in each test group was obviously inhibited, while compared with Example 3 and Comparative Examples 1-2, the water-soluble fertilizer product of Example 5 has a certain adaptability and salt-alkali resistance to the saline-alkali environment, indicating that potassium tartrate and ammonium citrate can play a synergistic role, so that the growth of the aboveground part and the root of wheat can play a certain salt-alkali resistance effect, and can improve the salt-alkali resistance of crops. This may be because potassium tartrate and ammonium citrate form an ion bridge between crops and water-soluble fertilizers, promote their absorption and utilization, increase the activity of proteases and amylases in crops, reduce the osmotic potential in cells, alleviate osmotic stress, and enhance the vitality of plants, so that plant metabolism develops in a normal direction and promotes plant growth.

[0116] It should be noted that in the present invention, the detailed steps of some operations are not described in detail, but belong to the prior art known to those skilled in the art, so they will not be repeated here. In addition, in the present invention, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are only for simplicity and convenience. Accordingly, the description of numerical ranges or percentage ranges should be deemed to have covered and specifically disclosed all possible secondary ranges and individual values ​​(including integers and fractions) within the range.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. In the present invention, not all possible combinations of the various technical features in the various embodiments or embodiments are described. As long as there is no contradiction in the combination of these technical features, the various technical features in the various embodiments or embodiments can be arbitrarily combined, and all possible combinations should be considered to be within the scope of this specification. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid, characterized in that: include: A pretreatment step of injecting water into the glutamic acid extract and adjusting the pH value to obtain a diluted glutamic acid extract; a mixing step of adding a mineral source water-soluble humate to the diluted glutamic acid extract to obtain a mixed liquid; a multi-element adding step of adding a macro-element fertilizer raw material and chelated trace element nutrients to the mixed liquid to obtain a multi-element liquid; and a post-treatment step of allowing the multi-element liquid to stand and filter to obtain a supernatant, wherein the supernatant is a water-soluble fertilizer product; The water-soluble fertilizer product has a dosage of 5-40 kg per mu and can be diluted 3,000-25,000 times.

2. The method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid according to claim 1, characterized in that: The operation of the pretreatment step is as follows: inject 5-20 times the amount of deionized water into the glutamic acid extract, and then use an alkaline raw material to adjust the pH value of the glutamic acid extract to 4.5-7.5 to obtain a diluted glutamic acid extract.

3. The method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid according to claim 2, characterized in that: The alkaline raw material is one or more of sodium hydroxide, potassium hydroxide, liquid ammonia and ammonia water.

4. The method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid according to claim 1, characterized in that: The operation of the mixing step is as follows: the diluted glutamic acid extract is heated to 30-80° C., the mineral source water-soluble humate is slowly added, and then stirred to fully dissolve to obtain a mixed liquid.

5. The method for preparing water-soluble fertilizer by combining glutamic acid extract and humic acid according to claim 1 or 4, characterized in that: The usage amount of the mineral source water-soluble humate is 0.2-3 times of the glutamic acid extract; the mineral source water-soluble humate is one or both of potassium humate and sodium humate.

6. The method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid according to claim 1, characterized in that: The operation of the multi-element adding step is as follows: adding a large amount of element fertilizer raw materials to the mixed liquid, stirring and dissolving them at 30-80°C, then adding chelated trace element nutrients, stirring and dissolving them, and then continuing to stir at 30-80°C for 3-15 hours, stopping stirring, and obtaining a multi-element liquid.

7. The method for preparing water-soluble fertilizer by combining glutamic acid extract and humic acid according to claim 1 or 6, characterized in that: The macronutrient fertilizer raw materials include nitrogen, phosphorus and potassium, wherein the ratio of nitrogen, phosphorus and potassium is 1:(0.5-1.5):(0.3-1.5).

8. The method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid according to claim 1, characterized in that: The operation of the post-treatment step is as follows: the multi-element liquid is allowed to stand and cool naturally, and after 5-36 hours, it is filtered through a 100-400 mesh sieve, and the obtained supernatant is a water-soluble fertilizer product in liquid dosage form.

9. The method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid according to claim 1, characterized in that: The method further comprises a granulation step; the operation of the granulation step is as follows: the liquid dosage form water-soluble fertilizer product is subjected to spray granulation to obtain a granular dosage form water-soluble fertilizer product.

10. A water-soluble fertilizer product, which is prepared by the method for preparing water-soluble fertilizer by combining glutamic acid extract with humic acid according to any one of claims 1 to 9, characterized in that: In the water-soluble fertilizer product, the humic acid content is 20-100 g / L, the free amino acid content is 4-30 g / L, the macronutrient content is 50-300 g / L, and the micronutrient content is 2-50 g / L.

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