Environment-friendly leaf fertilizer and preparation method thereof

Abstract

The invention discloses an environment-friendly foliar fertilizer and a preparation method thereof.The added seaweed extract contains natural plant hormones such as gibberellin and cytokinin, and the hormones have an adjusting effect on plant growth and can stimulate root development and growth of plants and increase the growth speed and yield of the plants. In addition, polysaccharide substances in the seaweed extract also have natural moisturizing and anti-stress capabilities, and help plants to maintain a good growth state in unfavorable environments such as drought and high temperature. And secondly, the natural-source components, such as the seaweed extract, the organic acid and the natural humectant, are adopted to replace some components in the traditional chemical fertilizer, so that the nutrient absorption effect of plants can be improved while the pollution to soil and water is reduced, and the requirements of green agriculture are met.

Description

Technical Field

[0001] The invention belongs to the field of foliar fertilizers, and in particular relates to an environmentally friendly foliar fertilizer and a preparation method thereof. Background Art

[0002] At present, most of the traditional fertilizers widely used in agricultural production are chemical fertilizers. Long-term reliance on chemical fertilizers will not only lead to soil compaction and reduced fertility, but also cause certain pollution to the environment, especially chemical residues in soil and water will affect the balance of the ecosystem. With the improvement of people's awareness of environmental protection, the development of green agriculture and the use of environmentally friendly fertilizers have become the research focus in the agricultural field.

[0003] Foliar fertilizer is a type of fertilizer that is absorbed by plant leaves and can be directly used by plants, significantly improving fertilizer utilization and reducing fertilizer loss in the soil. Compared with traditional soil fertilization, foliar fertilization can provide plants with the nutrients they need more quickly and reduce nutrient waste caused by soil solidification or loss. However, most existing foliar fertilizer products are single chemical ingredients, such as fertilizers in the form of minerals such as nitrogen, phosphorus, and potassium (NPK). 【1】 Although these chemical fertilizers can temporarily increase the nutrient supply of crops, they usually have the problem of low nutrient absorption efficiency, especially when the fertilizer concentration is too high, which may lead to an imbalance in plant nutrient absorption and reduce the content of other essential trace elements (such as copper and zinc).

[0004] In addition, the lack of beneficial microbial support is one of the main limitations of existing chemical foliar fertilizers. Microbial flora can enhance the long-term effectiveness of fertilizers by promoting root health and improving soil nutrient circulation. However, existing foliar fertilizer products, especially chemical fertilizer formulas, usually lack such biological support, making it difficult to release nutrients at a rate that matches plant needs, resulting in low fertilizer efficiency. 【2】 .

[0005] What is more serious is that the ingredients in chemical foliar fertilizers pose a potential hazard to the ecological environment. Excessive use of chemical ingredients can cause nutrients to enter groundwater through runoff or leakage, causing water pollution or eutrophication problems. For example, large amounts of nitrogen and phosphorus through foliar fertilization may cause eutrophication in water resources and even affect the overall environmental health of farmland. 【3】 Therefore, although foliar fertilizer has certain advantages in improving fertilizer use efficiency, its chemical composition and lack of microbial support in use lead to insufficient nutrient release and absorption efficiency, as well as potential risks of environmental impact.

[0006] References:

[0007] 【1】Ling,F.,&Silberbush,M.(2002).RESPONSE OF MAIZE TO FOLIAR VS.SOILAPPLICATION OF NITROGEN–PHOSPHORUS–POTASSIUM FERTILIZERS.Journal of PlantNutrition,25,2333-2342.

[0008] 【2】Mihalache,D.,Rissa,B., N.,Teodorescu,R.,Mihalache,M.,& C.(2019).Evaluation of the effect of 15N-labeled fertilizers on maizeplant.ROMANIAN BIOTECHNOLOGICAL

[0009] 【3】Elekhtyar,N.,&Al-Huqail,A.(2023).Effect of Foliar Application ofPhosphorus,Zinc,and Silicon Nanoparticles along with Mineral NPKFertilization on Yield and Chemical Compositions ofRice(OryzasativaL.).Agriculture.

[0010] In view of this, the present invention is proposed. Summary of the invention

[0011] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide an environmentally friendly foliar fertilizer and a preparation method thereof, and solve the problems raised in the above-mentioned background technology.

[0012] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0013] The invention discloses an environmentally friendly foliar fertilizer, which comprises the following ingredients in percentage by weight: 5%-15% nitrogen, 3%-10% phosphorus, 5%-10% potassium, 0.1%-1% iron, 0.1%-0.5% zinc, 0.05%-0.5% copper, 0.05%-0.5% manganese, 0.05%-0.5% boron, 0.01%-0.2% molybdenum, 1%-3% seaweed extract, 0.5%-3% organic acid, 0.5%-2% natural moisturizer, 0.01%-0.1% biological beneficial microbial strain, and the balance is water.

[0014] Optionally, one of citric acid and ethylenediaminetetraacetic acid is used, the natural moisturizer is one of glycerin and natural polysaccharides, the seaweed extract is a brown algae extract and contains gibberellins, cytokinins and polysaccharides, zinc is zinc sulfate, and iron is chelated iron.

[0015] Optionally, the biological beneficial microbial strain is a mixture of rhizobia and Bacillus subtilis, wherein the rhizobia are used for nitrogen fixation of leguminous crops, and the Bacillus subtilis are used for decomposing organic phosphorus in the soil, and the cell number ratio of the rhizobia and the Bacillus subtilis is 1:1.

[0016] A method for preparing an environmentally friendly foliar fertilizer comprises the following steps:

[0017] Step (1): dissolving nitrogen, phosphorus and potassium compounds in water respectively to prepare a basic solution;

[0018] Step (2): adding iron, zinc, copper, manganese, boron and molybdenum compounds to the base solution in sequence, stirring evenly to obtain a mixed solution ①;

[0019] Step (3): adding seaweed extract and organic acid to the mixed solution ①, stirring evenly to obtain a mixed solution ②;

[0020] Step (4): adding a natural moisturizer and a biological beneficial microbial strain to the mixed solution ②, and stirring evenly to obtain a mixed solution ③;

[0021] Step (5): adjusting the pH value of the mixed solution ③ to 6.0-6.5 using citric acid, and obtaining a mixed solution ④ after the adjustment is completed;

[0022] Step (6): Use a filter to filter out the insoluble matter in the mixed solution ④, and store the mixed solution ④ in a container.

[0023] Optionally, the biological beneficial microbial strains need to be activated before use, and the steps of the activation treatment are:

[0024] Step S1: preparing glucose, peptone, and phosphate and dissolving the glucose, peptone, and phosphate in deionized water, stirring them thoroughly to ensure uniform dissolution to obtain a culture medium solution, and then adjusting the pH value of the culture medium solution to 6.5-7.0 to obtain an activated culture medium;

[0025] Step S2: Heat the activation culture medium to 20°C to 30°C, add the prepared microbial strains to the culture medium, and add 10 6 -10 8 The active strains are then cultured at a constant temperature of 20°C to 30°C for 12 to 24 hours.

[0026] Optionally, the ratios of glucose, peptone and phosphate in step S1 are 1 g / L, 5 g / L and 0.5 g / L.

[0027] Optionally, in step S2, an air pump is required to provide sufficient oxygen to the culture medium during the activation process, with an air flow rate of 0.5 L / min per liter of culture medium, and the culture medium is continuously stirred at 100 rpm by a stirrer.

[0028] Optionally, the dissolution in step (1) needs to be stirred at 25-35° C. for 20-30 minutes.

[0029] The method for preparing an environmentally friendly foliar fertilizer according to claim 4, characterized in that the diameter of the filter holes in the filter screen in step (6) is 10-12 meshes.

[0030] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all the advantages described below at the same time:

[0031] The seaweed extract added in the present invention contains natural plant hormones, such as gibberellins, cytokinins, etc. These hormones have a regulatory effect on the growth of plants, can stimulate the root development and growth of plants, and increase the growth rate and yield of plants. In addition, the polysaccharides in the seaweed extract also have natural moisturizing and anti-stress capabilities, helping plants to maintain a good growth state under adverse environments such as drought and high temperature. Secondly, the present invention uses ingredients from natural sources, such as seaweed extracts, organic acids and natural moisturizers, to replace some ingredients in traditional chemical fertilizers, which can improve the absorption effect of plants on nutrients while reducing pollution to soil and water bodies, meeting the requirements of green agriculture. DETAILED DESCRIPTION

[0032] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0033] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0034] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0035] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present application description and examples are exemplary only.

[0036] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0037] In this embodiment, an environmentally friendly foliar fertilizer is provided, which contains the following ingredients in weight percentage: nitrogen 5%-15%, phosphorus 3%-10%, potassium 5%-10%, iron 0.1%-1%, zinc 0.1%-0.5%, copper 0.05%-0.5%, manganese 0.05%-0.5%, boron 0.05%-0.5%, molybdenum 0.01%-0.2%, seaweed extract 1%-3%, organic acid 0.5%-3%, natural moisturizer 0.5%-2%, biological beneficial microbial strain 0.01%-0.1%, and the balance is water.

[0038] A method for preparing an environmentally friendly foliar fertilizer comprises the following steps:

[0039] Step (1): dissolving nitrogen, phosphorus and potassium compounds in water respectively to prepare a basic solution;

[0040] Step (2): adding iron, zinc, copper, manganese, boron and molybdenum compounds to the base solution in sequence, stirring evenly to obtain a mixed solution ①;

[0041] Step (3): adding seaweed extract and organic acid to the mixed solution ①, stirring evenly to obtain a mixed solution ②;

[0042] Step (4): adding a natural moisturizer and a biological beneficial microbial strain to the mixed solution ②, and stirring evenly to obtain a mixed solution ③;

[0043] Step (5): adjusting the pH value of the mixed solution ③ to 6.0-6.5 using citric acid, and obtaining a mixed solution ④ after the adjustment is completed;

[0044] Step (6): Use a filter to filter out the insoluble matter in the mixed solution ④, and store the mixed solution ④ in a container.

[0045] In some embodiments of the present invention, the dissolution in step (1) needs to be stirred at 25-35° C. for 20-30 minutes.

[0046] In some embodiments of the invention, the diameter of the filter holes in step (6) is 10-12 mesh.

[0047] The organic acid used in the following embodiments is one of citric acid and ethylenediaminetetraacetic acid, the natural moisturizer is one of glycerol and natural polysaccharides, the seaweed extract is a brown algae extract containing gibberellins, cytokinins and polysaccharides, zinc is zinc sulfate, and iron is chelated iron.

[0048] Furthermore, the biological beneficial microbial strain used in the following embodiments is a mixture of rhizobia and Bacillus subtilis, wherein rhizobia is used for nitrogen fixation of leguminous crops, and Bacillus subtilis is used for decomposing organic phosphorus in the soil, and the cell number ratio of rhizobia to Bacillus subtilis is 1:1.

[0049] Furthermore, the beneficial microbial strains in the following embodiments need to be activated before use, and the steps of the activation treatment are as follows:

[0050] Step S1: preparing glucose, peptone, and phosphate and dissolving the glucose, peptone, and phosphate in deionized water, stirring them thoroughly to ensure uniform dissolution to obtain a culture medium solution, and then adjusting the pH value of the culture medium solution to 6.5 to obtain an activated culture medium;

[0051] Step S2: Heat the activation medium to 20°C, add the prepared microbial strains to the medium, and add 10 6 The active strains were then cultured at a constant temperature of 20°C for 17 hours.

[0052] In this embodiment, the ratios of glucose, peptone and phosphate in step S1 are 1 g / L, 5 g / L and 0.5 g / L.

[0053] In this embodiment, an air pump is required to provide sufficient oxygen to the culture medium during the activation process in step S2, the air flow rate is 0.5 liters / minute per liter of culture medium, and the culture medium is continuously stirred at a speed of 100 rpm by a stirrer.

[0054] The present invention will now be further described in detail with reference to embodiments.

[0055] It should be noted that all raw materials in the examples of the present invention were obtained through commercial sources.

[0056] Example 1: An environmentally friendly foliar fertilizer suitable for the seedling stage, comprising the following raw materials: 7% nitrogen, 4% phosphorus, 5% potassium, 0.7% iron, 0.4% zinc, 0.3% copper, 0.3% manganese, 0.2% boron, 0.08% molybdenum, 2.5% seaweed extract, 1% organic acid, 1.5% natural moisturizer, and 0.1% biological beneficial microbial strain.

[0057] The preparation method of the environmentally friendly foliar fertilizer suitable for the seedling stage comprises the following steps:

[0058] Step 1: Prepare a base solution by dissolving nitrogen, phosphorus and potassium compounds in water, maintaining the temperature at 25°C and stirring for 20 minutes.

[0059] Step 2: Add chelated iron, zinc sulfate, copper, manganese, boron and molybdenum to the basic solution and stir evenly to obtain a mixed solution①.

[0060] Step 3: Add seaweed extract and citric acid to the mixed solution ①, and stir evenly to obtain a mixed solution ②.

[0061] Step 4: Add glycerol and activated biological beneficial microbial strains, stir evenly to obtain a mixed solution ③.

[0062] Step 5: Use citric acid to adjust the pH value of the mixed solution ③ to 6.2, and obtain a mixed solution ④ after the adjustment is completed.

[0063] Step 6: Use a 10-mesh filter to filter out insoluble matter and store in a container.

[0064] Example 2: An environmentally friendly foliar fertilizer suitable for the heading period includes the following raw materials: 12% nitrogen, 6% phosphorus, 8% potassium, 0.5% iron, 0.3% zinc, 0.2% copper, 0.2% manganese, 0.1% boron, 0.05% molybdenum, 3% seaweed extract, 1.5% organic acid, 1% natural moisturizer, 0.08% biological beneficial microbial strain, and the balance is water.

[0065] A method for preparing an environmentally friendly foliar fertilizer suitable for the heading period comprises the following steps:

[0066] Step 1: Prepare a base solution by dissolving nitrogen, phosphorus and potassium compounds in water, maintaining the temperature at 30°C and stirring for 25 minutes.

[0067] Step 2: Add chelated iron, zinc sulfate, copper, manganese, boron and molybdenum to the basic solution and stir evenly to obtain a mixed solution①.

[0068] Step 3: Add seaweed extract and ethylenediaminetetraacetic acid to the mixed solution ①, and stir evenly to obtain a mixed solution ②.

[0069] Step 4: Add natural polysaccharides and activated biological beneficial microbial strains, stir evenly to obtain a mixed solution ③.

[0070] Step 5: Use citric acid to adjust the pH value of the mixed solution ③ to 6.5, and obtain a mixed solution ④ after the adjustment is completed.

[0071] Step 6: Use a 12-mesh filter to filter out insoluble matter and store in a container.

[0072] Example 3: The raw materials of the environmentally friendly foliar fertilizer suitable for the fruiting period include: 14% nitrogen (N), 8% phosphorus, 10% potassium, 1% iron, 0.5% zinc, 0.5% copper, 0.5% manganese, 0.5% boron, 0.1% molybdenum, 2% seaweed extract, 2% organic acid, 2% natural moisturizer, 0.05% biological beneficial microbial strain, and the balance is water.

[0073] The preparation method of the environmentally friendly foliar fertilizer suitable for the fruiting period comprises the following steps:

[0074] Step 1: Prepare a base solution by dissolving nitrogen, phosphorus and potassium compounds in water, maintaining 35°C and stirring for 30 minutes.

[0075] Step 2: Add chelated iron, zinc sulfate, copper, manganese, boron and molybdenum to the basic solution and stir evenly to obtain a mixed solution①.

[0076] Step 3: Add seaweed extract and citric acid to the mixed solution ①, and stir evenly to obtain a mixed solution ②.

[0077] Step 4: Add glycerol and activated biological beneficial microbial strains, stir evenly to obtain a mixed solution ③.

[0078] Step 5: Use citric acid to adjust the pH value of the mixed solution ③ to 6.0, and obtain a mixed solution ④ after the adjustment is completed.

[0079] Step 6: Use a 10-mesh filter to filter out insoluble matter and store in a container.

[0080] Experimental example:

[0081] Experimental object: Corn

[0082] Experimental environment: field test, average daily temperature 25-30℃, humidity 40%-60%.

[0083] Experimental period: 120 days, divided into seedling stage, heading stage and fruiting stage.

[0084] Example group: Using the foliar fertilizer with complete formula, corn was fertilized using Example 1, Example 2, and Example 3 in sequence.

[0085] Application frequency: spray once on the 1st day, 15th day, 30th day and every 10 days in each stage (seedling stage, heading stage and fruiting stage).

[0086] Monitoring indicators

[0087] Plant height, leaf area index (LAI), root development, and chlorophyll content (SPAD value) were monitored during the seedling stage (0-30 days).

[0088] During the heading period (31-70 days), monitor plant height, ear length, ear weight, and the content of nutrients such as nitrogen, phosphorus, potassium, iron, and zinc in the leaves.

[0089] During the fruiting period (71-120 days), monitor the dry weight of grains, yield per plant, thousand-grain weight, and the content of nutrients such as nitrogen, phosphorus, potassium, iron, and zinc in the grains.

[0090] For specific experimental data, please refer to Table 1-3.

[0091] Table 1: Seedling stage (0-30 days) data results

[0092]

[0093] Table 2: Heading period (31-70 days) data results

[0094]

[0095] Table 3: Fruiting period (71-120 days) data results

[0096]

[0097]

[0098] As can be seen from Table 1, biological beneficial microbial strains, such as rhizobia and Bacillus subtilis, are added to Example 1. These strains provide additional nitrogen to plants through nitrogen fixation during the seedling stage, while increasing the availability of phosphorus and potassium in the soil, and significantly improving the nutrient absorption efficiency of plants. Secondly, the microbial strains in Example 1 significantly promote root development. The root system is the key to plant absorption of water and nutrients. A developed root system enables plants to obtain more water and nutrients in the early stages, laying a solid foundation for subsequent growth. Due to the nitrogen fixation of rhizobia, plants obtain a higher nitrogen supply, which directly promotes the synthesis of chlorophyll in the leaves, so that the SPAD value (chlorophyll content) of the plant is significantly improved.

[0099] As shown in Table 2, Example 2 shows the best effect at the heading stage, because it contains efficient seaweed extracts, which contain plant hormones such as gibberellins, cytokinins and polysaccharides, which can effectively promote the development of spikes at the critical heading stage. And the seaweed extract in Example 2 can effectively improve the absorption efficiency of key nutrients such as nitrogen, phosphorus and potassium in plants. Compared with Example 1, although Example 1 performed well at the seedling stage, the nutrient absorption effect and spike development of Example 2 were more obvious at the heading stage, which reflects the key role of seaweed extracts at this stage. Finally, the polysaccharides and plant hormones in the seaweed extracts not only promote the growth of plants, but also enhance the stress resistance of plants, so that they can still maintain a good growth state under adverse environmental conditions (such as drought, high temperature, etc.).

[0100] As can be seen from Table 3, Example 3 performed best during the fruiting period, mainly due to the chelated iron and other trace elements contained in the formula. These elements play a key role in nutrient accumulation and grain development during the fruiting period of plants. Chelated iron improves the plant's absorption of iron, which is an essential trace element for various metabolic processes in plants (such as photosynthesis and respiration) and directly affects the development of grains. As can be seen from Table 3, the plants in Example 3 are significantly higher than other examples in terms of single plant yield and thousand-grain weight, proving that providing key trace elements such as chelated iron during the fruiting period is an effective way to increase final yield.

[0101] In addition to the increase in yield, Example 3 also improves the nutritional quality of the grains. Experimental data show that the content of nitrogen, phosphorus, potassium, iron, zinc and other elements in the plants of Example 3 during the fruiting period is significantly higher than that of the control group, indicating that the formula can help plants absorb nutrients more effectively and store them in the grains.

[0102] In summary, Example 1 improves the nutrient absorption and root development of plants through biological beneficial microbial strains in the seedling stage, promotes early healthy growth, and improves photosynthesis efficiency. In Example 1, a large number of microbial strains will produce a synergistic reaction with organic acids, wherein organic acids not only play a role in helping to chelate trace elements, but also form a unique nutritional synergistic effect with microbial strains. The addition of organic acids can enhance the active metabolism of microorganisms, improve the microenvironment of the rhizosphere, further stimulate the nitrogen fixation ability of rhizobia, and accelerate the release of phosphorus and potassium. This dual reaction forms a dynamic supply mechanism of nutrients through the efficient metabolism of microorganisms in a slightly acidic environment, so that plants can not only obtain rapid nutritional support in the seedling stage, but also continuously improve root development.

[0103] Example 2 Relying on the synergistic reaction of seaweed extract natural moisturizer at the heading stage, the ear length, ear weight and nutrient absorption efficiency of the plant are significantly improved, and the stress resistance of the plant is enhanced, so that it performs well in the key development stage. More specifically, seaweed extract is rich in plant hormones, and hormones play a vital role in promoting plant cell division and growth and development. However, plant hormones themselves are susceptible to external conditions, causing them to volatilize or decompose faster on the leaf surface, thereby affecting their ability to continue to act. The addition of natural moisturizers can form a thin film on the leaf surface through water retention. This film not only delays the evaporation of water, but also locks the plant hormones in the seaweed extract to prevent them from volatilizing or decomposing quickly. This synergistic effect ensures that the plant hormones can remain active on the leaf surface for a longer time, extending the time for hormones to regulate plant growth.

[0104] Secondly, the film of natural moisturizer has a certain slow-release property, so that the plant hormones will not be quickly absorbed by the plant at one time, but gradually penetrate into the inner part of the leaves. Compared with the use of seaweed extract alone, natural moisturizers slow down the absorption rate of hormones, so that hormones can be continuously used by plants for a long time. This slow-release effect ensures that the plant can stably receive the regulation of plant hormones throughout the heading period, avoiding growth stagnation caused by rapid consumption of hormones, continuously promoting plant cell division, ear development and growth, and ultimately increasing ear length and weight.

[0105] In addition, the thin film of natural moisturizer also provides a protective barrier that can shield against adverse external environmental conditions. The polysaccharides in seaweed extract also have the effect of enhancing the stress resistance of plants, and the presence of moisturizers further prolongs this stress resistance effect, enabling plants to show better resistance when facing adverse environments.

[0106] Example 3: During the fruiting period, the combined action of chelated iron and molybdenum increases the yield per plant and thousand-grain weight, improves the maturity and nutrient storage of grains, and enables corn to accumulate dry matter faster and reach a better state of maturity. In particular, with the participation of chelated iron, the overall process of nitrogen metabolism is supported by energy and metabolic power. Chelated iron not only provides the trace element of iron, but also ensures the stability and effectiveness of iron in the plant body through chelated form. Iron is a key element for photosynthesis, which is used to ensure that plants can smoothly carry out nitrate reduction and nitrogen assimilation processes.

[0107] The sufficient energy provided by chelated iron further enhances the role of molybdenum. With sufficient energy support, molybdenum, as a cofactor of nitrate reductase, maximizes its activity, accelerates the enzymatic reaction, and significantly improves the conversion efficiency of nitrate nitrogen. The role of molybdenum not only accelerates the nitrate reduction reaction, but also promotes the efficient operation of the entire nitrogen assimilation process. Through this synergistic effect, plants can more quickly convert inorganic nitrogen into organic nitrogen that can be directly used for protein synthesis, ensuring that plants can obtain sufficient nitrogen source support during the fruiting period.

[0108] During the fruiting period, plants need a lot of nitrogen to synthesize amino acids and proteins to ensure the rapid development and filling of grains. The presence of molybdenum improves the efficiency of nitrogen utilization by plants by accelerating the activity of nitrate reductase, and promotes the whole process from nitrogen absorption to conversion into protein. At the same time, chelated iron further provides sufficient energy support for this process by improving the efficiency of plant photosynthesis. This synergistic effect not only accelerates the accumulation of protein in the grains, but also significantly increases the filling speed, allowing the grains to reach maturity faster.

[0109] The present invention is not limited to the above-mentioned embodiments. Anyone should be aware that any structural changes made under the enlightenment of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention. The technology, shape, and structural parts not described in detail in the present invention are all well-known technologies.

Claims

1. An environmentally friendly foliar fertilizer, characterized in that: The foliar fertilizer comprises the following ingredients in weight percentage: 5%-15% nitrogen, 3%-10% phosphorus, 5%-10% potassium, 0.1%-1% iron, 0.1%-0.5% zinc, 0.05%-0.5% copper, 0.05%-0.5% manganese, 0.05%-0.5% boron, 0.01%-0.2% molybdenum, 1%-3% seaweed extract, 0.5%-3% organic acid, 0.5%-2% natural moisturizer, 0.01%-0.1% biological beneficial microbial strain, and the balance is water.

2. An environmentally friendly foliar fertilizer according to claim 1, characterized in that, The organic acid is one of citric acid and ethylenediaminetetraacetic acid, the natural moisturizer is one of glycerin and natural polysaccharides, the seaweed extract is brown algae extract and contains gibberellins, cytokinins and polysaccharides, zinc is zinc sulfate, and iron is chelated iron.

3. An environmentally friendly foliar fertilizer according to claim 1, characterized in that, The biological beneficial microbial strain is a mixture of rhizobia and bacillus subtilis, wherein the rhizobia is used for nitrogen fixation of leguminous crops, and the bacillus subtilis is used for decomposing organic phosphorus in the soil, and the cell number ratio of the rhizobia to the bacillus subtilis is 1:

1.

4. A method for preparing an environmentally friendly foliar fertilizer, characterized in that: The following steps are involved: Step (1): dissolving nitrogen, phosphorus and potassium compounds in water respectively to prepare a basic solution; Step (2): adding iron, zinc, copper, manganese, boron and molybdenum compounds to the base solution in sequence, stirring evenly to obtain a mixed solution ①; Step (3): adding seaweed extract and organic acid to the mixed solution ①, stirring evenly to obtain a mixed solution ②; Step (4): adding a natural moisturizer and a biological beneficial microbial strain to the mixed solution ②, and stirring evenly to obtain a mixed solution ③; Step (5): adjusting the pH value of the mixed solution ③ to 6.0-6.5 using citric acid, and obtaining a mixed solution ④ after the adjustment is completed; Step (6): Use a filter to filter out the insoluble matter in the mixed solution ④, and store the mixed solution ④ in a container.

5. The method for preparing an environmentally friendly foliar fertilizer according to claim 4, characterized in that: The biological beneficial microbial strains need to be activated before use. The steps of activation treatment are: Step S1: preparing glucose, peptone, and phosphate and dissolving the glucose, peptone, and phosphate in deionized water, stirring them evenly to obtain a culture medium solution, and then adjusting the pH value of the culture medium solution to 6.5-7.0 to obtain an activated culture medium; Step S2: Heat the activation culture medium to 20°C to 30°C, add the prepared microbial strains to the culture medium, and add 10 6 -10 8 The active strains are then cultured at a constant temperature of 20°C to 30°C for 12 to 24 hours.

6. The method for preparing an environmentally friendly foliar fertilizer according to claim 5, characterized in that: The ratios of glucose, peptone and phosphate in step S1 are 1 g / L, 5 g / L and 0.5 g / L.

7. An environmentally friendly foliar fertilizer and a preparation method thereof according to claim 5, characterized in that: In step S2, an air pump is required to provide sufficient oxygen to the culture medium during the activation process. The air flow rate of the air pump is 0.5 liters / minute per liter of culture medium, and the air pump continuously stirs the culture medium at a speed of 100 rpm through the agitator while delivering oxygen.

8. The method for preparing an environmentally friendly foliar fertilizer according to claim 4, characterized in that: During the dissolution in step (1), stirring is required at 25-35° C. for 20-30 minutes.

9. The method for preparing an environmentally friendly foliar fertilizer according to claim 4, characterized in that: The diameter of the filter holes in step (6) is 10-12 meshes.

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