Nitro synergistic compound fertilizer containing polyglutamic acid and preparation method of nitro synergistic compound fertilizer

Abstract

The invention discloses a nitro synergistic compound fertilizer containing polyglutamic acid and a preparation method of the nitro synergistic compound fertilizer. The compound fertilizer comprises the following components in parts by mass: 10-30 parts of a nitrogen element substance, 5-30 parts of a phosphorus element substance, 10-30 parts of a potassium element substance and 0-2 parts of polyglutamic acid (not 0). According to the nitro synergistic compound fertilizer containing the polyglutamic acid and the preparation method of the nitro synergistic compound fertilizer, the polyglutamic acid is added into the nitro compound fertilizer, so that release of nitrogen, phosphorus and potassium can be delayed, nutrient loss in the compound fertilizer is reduced, and the fertilization frequency is reduced; and the polyglutamic acid can chelate Ca / Fe, so that phosphorus precipitation is reduced, and the effectiveness of phosphorus is improved.

Description

Technical Field

[0001] This invention relates to the field of fertilizer manufacturing technology, and in particular to a nitro-enhanced compound fertilizer containing polyglutamic acid and its preparation method. Background Technology

[0002] Compound fertilizer is a chemical fertilizer containing two or more of the major nutrients such as nitrogen (N), phosphorus (P), and potassium (K). It provides comprehensive nutritional support for crops, promotes crop growth and development, and improves yield and quality. As a chemical fertilizer containing two or more of the major nutrients, compound fertilizer has advantages such as high nutrient content, fewer by-products, and good physical properties. It plays a vital role in balanced fertilization, improving fertilizer utilization, and promoting high and stable crop yields.

[0003] Nitro compound fertilizers are widely used in cash crops such as vegetables, fruit trees, tobacco, and cotton. Their advantages are that they are fast-acting, effective, and highly adaptable. However, nitro compound fertilizers have disadvantages such as being easily leached by rainwater or irrigation water, requiring small amounts to be applied frequently, and being intolerant of high temperatures. Their fast release rate can also lead to excessive loss of fertilizer effectiveness in some cases, resulting in the need for multiple applications. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a nitro-enhanced compound fertilizer containing polyglutamic acid and its preparation method.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention discloses a nitro-enhanced compound fertilizer containing polyglutamic acid, wherein the compound fertilizer comprises 10-30 parts by weight of nitrogen, 5-30 parts by weight of phosphorus, 10-30 parts by weight of potassium, and 0-2 parts by weight of polyglutamic acid, and is not zero.

[0006] In a preferred embodiment of the present invention, the nitrogen element is ammonium nitrate.

[0007] In a preferred embodiment of the present invention, the amount of ammonium nitrate is 15 parts.

[0008] As a preferred embodiment of the present invention, the phosphorus element is at least one of monoammonium phosphate and diammonium phosphate.

[0009] As a preferred embodiment of the present invention, the monoammonium phosphate is present in 5 parts.

[0010] As a preferred embodiment of the present invention, the potassium element is at least one of potassium nitrate and potassium sulfate.

[0011] In a preferred embodiment of the present invention, potassium sulfate comprises 2 parts.

[0012] In a preferred embodiment of the present invention, the polyglutamic acid is 1 part.

[0013] As a preferred embodiment of the present invention, the compound fertilizer further includes 1-2 parts of humic acid, 1-2 parts of alginic acid, 0.5-1 parts of amino acids, 0.1-0.6 parts of trace element chelating agent, and 0.1-0.2 parts of biological agent.

[0014] This invention discloses a method for preparing a nitro-enhanced compound fertilizer containing polyglutamic acid, comprising the following steps: The raw materials that need to be preheated are then fed into a mixer for mixing and stirring to obtain a molten liquid; The molten liquid is fed into a granulation device for granulation to obtain fertilizer granules; After the fertilizer granules are cooled, they are sprayed with a brown algae oligosaccharide solution and then sent to a coating machine for coating to obtain a nitro-enhanced compound fertilizer containing polyglutamic acid.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: Adding polyglutamic acid to nitro compound fertilizer can delay the release of nitrogen, phosphorus, and potassium, reduce nutrient loss from the compound fertilizer, and thus reduce the number of fertilizations. Polyglutamic acid can also chelate Ca²⁺ / Fe³⁺, reduce phosphorus precipitation, and improve phosphorus availability. Detailed Implementation

[0016] The preferred embodiments of the present invention are described below. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] This invention provides a nitro-enhanced compound fertilizer containing polyglutamic acid and its preparation method. The nitro-enhanced compound fertilizer containing polyglutamic acid is characterized in that the compound fertilizer comprises 10-30 parts by weight of nitrogen, 5-30 parts by weight of phosphorus, 10-30 parts by weight of potassium, and 0-2 parts by weight of polyglutamic acid, and is not 0.

[0019] Furthermore, the nitrogen-containing substance is ammonium nitrate.

[0020] Furthermore, the amount of ammonium nitrate is 15 parts.

[0021] Furthermore, the phosphorus element is at least one of monoammonium phosphate and diammonium phosphate.

[0022] Furthermore, the amount of monoammonium phosphate is 5 parts.

[0023] Furthermore, the potassium element is at least one of potassium nitrate and potassium sulfate.

[0024] Furthermore, the amount of potassium nitrate is 23 parts and the amount of potassium sulfate is 2 parts.

[0025] Furthermore, the amount of polyglutamic acid is 1 part.

[0026] Furthermore, the compound fertilizer also includes 1-2 parts humic acid, 1-2 parts alginic acid, 0.5-1 parts amino acids, 0.1-0.6 parts trace element chelating agent, and 0.1-0.2 parts biological agent.

[0027] The present invention provides a preparation method comprising the following steps: The raw materials that need to be preheated are then fed into a mixer for mixing and stirring to obtain a molten liquid; The molten liquid is fed into a granulation device for granulation to obtain fertilizer granules; After the fertilizer granules are cooled, they are sprayed with a brown algae oligosaccharide solution and then sent to a coating machine for coating to obtain a nitro-enhanced compound fertilizer containing polyglutamic acid.

[0028] Example 1: This nitro-enhanced compound fertilizer contains the following substances: 300 kg of ammonium nitrate, 100 kg of monoammonium phosphate, 460 kg of potassium nitrate, 40 kg of potassium sulfate, and 20 kg of polyglutamic acid; the above substances are granulated using the preparation method described in this invention to obtain nitro-enhanced compound fertilizer granules. In this embodiment, brown algae oligosaccharides are not sprayed.

[0029] Example 2: This nitro-enhanced compound fertilizer contains the following substances: 300 kg of ammonium nitrate, 200 kg of monoammonium phosphate, 460 kg of potassium nitrate, 40 kg of potassium sulfate, and 20 kg of polyglutamic acid; the above substances are granulated using the preparation method described in this invention to obtain nitro-enhanced compound fertilizer granules. In this embodiment, brown algae oligosaccharides are not sprayed.

[0030] Example 3: This nitro-enhanced compound fertilizer contains the following substances: 300 kg of ammonium nitrate, 100 kg of diammonium phosphate, 460 kg of potassium nitrate, 40 kg of potassium sulfate, and 20 kg of polyglutamic acid; the above substances are granulated using the preparation method described in this invention to obtain nitro-enhanced compound fertilizer granules. In this embodiment, brown algae oligosaccharides are not sprayed.

[0031] Example 4: This nitro-enhanced compound fertilizer contains the following substances: 300 kg of ammonium nitrate, 50 kg of monoammonium phosphate, 50 kg of diammonium phosphate, 460 kg of potassium nitrate, 40 kg of potassium sulfate, and 20 kg of polyglutamic acid; the above substances are granulated using the preparation method described in this invention to obtain nitro-enhanced compound fertilizer granules. In this embodiment, brown algae oligosaccharides are not sprayed.

[0032] Example 5: This nitro-enhanced compound fertilizer contains the following substances: 300 kg of ammonium nitrate, 100 kg of monoammonium phosphate, 500 kg of potassium nitrate, and 20 kg of polyglutamic acid; the above substances are granulated using the preparation method described in this invention to obtain nitro-enhanced compound fertilizer granules. In this embodiment, brown algae oligosaccharides are not sprayed.

[0033] Example 6: This nitro-enhanced compound fertilizer contains the following substances: 300 kg of ammonium nitrate, 100 kg of monoammonium phosphate, 460 kg of potassium nitrate, 40 kg of potassium sulfate, and 20 kg of polyglutamic acid; the above substances are granulated using the preparation method described in this invention to obtain nitro-enhanced compound fertilizer granules, and in this embodiment, brown algae oligosaccharides are sprayed.

[0034] Example 7: This nitro-enhanced compound fertilizer contains the following substances: 300 kg of ammonium nitrate, 100 kg of monoammonium phosphate, 460 kg of potassium nitrate, 40 kg of potassium sulfate, 20 kg of polyglutamic acid, 20 kg of humic acid, 20 kg of alginic acid, 10 kg of amino acids (glycine-alanine 6:4), 2 kg of trace element chelating agents (EDTA-Fe, EDTA-Zn 1:1), and 0.1 parts of biological agent; the above substances are granulated using the preparation method described in this invention to obtain nitro-enhanced compound fertilizer granules. In this embodiment, brown algae oligosaccharides are not sprayed.

[0035] Comparative Example 1: Conventional nitro compound fertilizer with NPK: 15-5-25 and total nutrients ≥45%.

[0036] Comparative experimental design: Experimental area: Aksu cotton core production area, Xinjiang; Experimental area: 8 mu of land was planned for cotton planting, and the fertilizers described in Examples 1-7 and Comparative Example 1 were applied to each mu of land respectively; Cotton variety: Xinluzhong 82, planted at conventional density; Fertilization time: Deep plow and apply 40 kg / mu one week before sowing, apply 10 kg / mu during the budding stage, and apply 10 kg / mu during the flowering and boll-forming stage.

[0037] Testing indicators: Emergence rate: 10 days after emergence, the number of seedlings emerging per unit area / number of seeds sown × 100%; Plant height: Measure the height of the main stem with a measuring tape during the flowering and boll-forming period; Chlorophyll content was measured every 10 days, and functional leaves were measured using a SPAD instrument. Root vigor was measured by TTC reduction method at the budding and flowering / bolling stages. Number of bolls per plant, counted at harvest time; Boll weight: Weigh 50 cotton bolls at harvest and calculate the average value. Liner weight is determined by measuring the ratio of seed cotton weight to lint weight after ginning. Total yield: After harvest, the actual weight of lint cotton harvested from each experimental field is calculated and converted into yield per mu (unit of land area). Fiber length, breaking strength, and micronaire value were measured using an HVI high-capacity fiber tester after harvest. Table 1

[0038] As can be seen from Table 1, the cotton seedling emergence rate, plant height, chlorophyll value and root activity of the nitro-enhanced compound fertilizer formulated according to the present invention are significantly higher than those of the cotton using conventional fertilizer in Comparative Example 1.

[0039] Table 2

[0040] As can be seen from Table 2, the cotton using the nitro-enhanced compound fertilizer of the present invention has significantly higher performance indicators than the cotton using conventional fertilizer in Comparative Example 1.

[0041] This invention relates to a nitro-enhanced compound fertilizer containing polyglutamic acid and its preparation method. Adding polyglutamic acid to the nitro-compound fertilizer can delay the release of nitrogen, phosphorus, and potassium, reduce nutrient loss in the compound fertilizer, and thus reduce the number of fertilizations. The polyglutamic acid can also chelate Ca²⁺ / Fe³⁺, reduce phosphorus precipitation, and improve phosphorus availability.

[0042] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A nitro-enhanced compound fertilizer containing polyglutamic acid, characterized in that, The compound fertilizer comprises 10-30 parts by weight of nitrogen, 5-30 parts by weight of phosphorus, 10-30 parts by weight of potassium, and 0-2 parts by weight of polyglutamic acid, and is not zero.

2. The nitro-enhanced compound fertilizer containing polyglutamic acid according to claim 1, characterized in that, The nitrogen element is ammonium nitrate.

3. The nitro-enhanced compound fertilizer containing polyglutamic acid according to claim 2, characterized in that, The amount of ammonium nitrate is 15 parts.

4. The nitro-enhanced compound fertilizer containing polyglutamic acid according to claim 1, characterized in that, The phosphorus element is at least one of monoammonium phosphate and diammonium phosphate.

5. The nitro-enhanced compound fertilizer containing polyglutamic acid and its preparation method according to claim 4, characterized in that, The monoammonium phosphate is in the form of 5 parts.

6. The nitro-enhanced compound fertilizer containing polyglutamic acid according to claim 1, characterized in that, The potassium element is at least one of potassium nitrate and potassium sulfate.

7. A nitro-enhanced compound fertilizer containing polyglutamic acid according to claim 6, characterized in that, The amount of potassium nitrate is 23 parts and the amount of potassium sulfate is 2 parts.

8. A nitro-enhanced compound fertilizer containing polyglutamic acid according to any one of claims 1-7, characterized in that, The polyglutamic acid content is 1 part.

9. A nitro-enhanced compound fertilizer containing polyglutamic acid according to claim 8, characterized in that, The compound fertilizer also includes 1-2 parts humic acid, 1-2 parts alginic acid, 0.5-1 parts amino acids, 0.1-0.6 parts trace element chelating agent, and 0.1-0.2 parts biological agent.

10. A preparation method, characterized in that, Includes the following steps: The raw materials that need to be preheated are then fed into a mixer for mixing and stirring to obtain a molten liquid; The molten liquid is fed into a granulation device for granulation to obtain fertilizer granules; After the fertilizer granules are cooled, they are sprayed with a brown algae oligosaccharide solution and then sent to a coating machine for coating to obtain a nitro-enhanced compound fertilizer containing polyglutamic acid.

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