Compound fertilizer containing cluster-state rooting synergist as well as preparation method and application of compound fertilizer

Abstract

The invention relates to the technical field of fertilizers, in particular to a compound fertilizer containing a poly-complex rooting synergist and a preparation method and application thereof, and the compound fertilizer comprises the poly-complex rooting synergist, potassium sulfate or potassium chloride, urea, monoammonium phosphate, trace elements, a water-soluble granulating agent, an anti-hardening oil agent and anti-hardening powder. The production process is green and environment-friendly, no three wastes are generated, the yield of the complexed rooting synergist is high, granulation is performed through a roller or a high tower and monoammonium phosphate, urea and other raw materials, the method is simple, and the production cost is low. The compound fertilizer containing the complex rooting synergist prepared by the invention can obviously improve the root length, the root net weight and the total net weight of plants. The product has the advantages of good water solubility, high use efficiency, high added value and the like, and provides a new research and development direction for the development of rooting type compound fertilizer products in agriculture.

Description

Technical Field

[0001] The present invention relates to the technical field of fertilizers, and particularly provides a compound fertilizer containing a poly-complex rooting synergist, a preparation method and an application thereof, which can not only effectively improve the yield and quality of crops, but also reduce environmental pollution and damage, and provide strong support for the sustainable development of agricultural production. Background Art

[0002] As is well known, with the enhancement of people's awareness of environmental protection, the traditional compound fertilizer industry is gradually abandoning the production methods with high pollution and high energy consumption, and turning to a functional, green, personalized and sustainable production mode. As an environmentally friendly and efficient fertilizer, the rooting functional compound fertilizer has the advantages of significantly promoting the growth and development of plant roots, improving the stress resistance and yield of crops, etc., and meets the development requirements of green agriculture and ecological agriculture. In order to improve the production efficiency and product quality of the rooting compound fertilizer, scientific workers are constantly optimizing and improving the production process and formula of the rooting functional compound fertilizer. For example, adding microbial stimulants to promote crop rooting has the advantages of environmental protection, greenness and safety. However, there are currently disadvantages such as an unclear root-promoting effect and a short action period.

[0003] When the rooting compound fertilizer is used in excess, especially the fertilizer containing hormonal rooting agents, it may disrupt the internal hormone balance of plants, resulting in problems such as premature senescence and deformed fruits of crops, thus affecting the quality and yield of crops. According to the laws of our country, it is prohibited to add hormonal drugs to fertilizers, otherwise they will be treated as fake fertilizers and punished. In addition, the use of an unreasonable rooting compound fertilizer formula will also lead to insufficient soil nutrient supply, and excessive root growth will limit the growth of crops. Therefore, when using the rooting compound fertilizer, it is necessary to strictly adjust the formula and application rate to ensure that the crops receive a comprehensive nutrient supply. Compared with traditional fertilizers, the production cost of the rooting compound fertilizer is usually higher, which brings economic pressure to farmers in using the rooting compound fertilizer. To solve this problem, it can be achieved by strictly adjusting the ratio of different nutrient elements and developing new rooting synergists to manufacture a rooting compound fertilizer suitable for different crops with pertinence and applicability. This also helps to provide more scientific fertilization guidance for agricultural production, improve fertilizer utilization rate and crop yield. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a compound fertilizer containing a poly-complex rooting synergist, a preparation method and an application thereof. The preparation process is simple, the cost is low, the structure is clear, and the naphthalene ring carboxylic acid structure contained in the structure is complexed with zinc, so that the rooting effect of the product is significantly enhanced.

[0005] The present invention is realized as follows: A compound fertilizer containing a polycomplex rooting synergist is provided. By weight, it includes 0.7 - 1.2 parts of the polycomplex rooting synergist, 180 - 190 parts of potassium sulfate or potassium chloride, 240 - 250 parts of urea, 165 - 175 parts of monoammonium phosphate, 20 - 25 parts of trace elements, 10 - 20 parts of a water-soluble granulating agent, 1 - 1.5 parts of an anti-caking oil agent, and 1 - 1.5 parts of an anti-caking powder.

[0006] Preferably, the molecular formula of the polycomplex rooting synergist is [Zn(C6H8N2)(C 12 H6O4)] n , and the structural formula is:

[0007]

[0008] Preferably, the crystal form of the polycomplex rooting synergist is monoclinic system, and the space group is P 21 / c.

[0009] Preferably, the trace element is manganese sulfate or zinc sulfate, the water-soluble granulating agent is anhydrous magnesium sulfate, the anti-caking oil agent is diethylaminoethanol succinate, and the anti-caking powder is polyvinyl alcohol.

[0010] A preparation method of the compound fertilizer containing the polycomplex rooting synergist is provided. Weigh the polycomplex rooting synergist, potassium sulfate or potassium chloride, urea, monoammonium phosphate, trace elements, and water-soluble granulating agent according to the parts by weight, crush and mix them evenly, then granulate, and finally add the anti-caking oil agent and anti-caking powder to obtain the compound fertilizer containing the polycomplex rooting synergist.

[0011] Preferably, the preparation method of the polycomplex rooting synergist includes the following steps:

[0012] 1) Using 2-amino-5-methylpyridine, 1,4-naphthalenedicarboxylic acid, and zinc nitrate hexahydrate as raw materials, in a certain proportion, using water as a solvent, adjusting the pH value to 9, heating and refluxing at a certain temperature for a certain reaction time;

[0013] 2) After the reaction, filter the product by suction for a certain time;

[0014] 3) Finally, dry at a certain temperature for a certain time to obtain the polycomplex rooting synergist.

[0015] Preferably, in the step 1), the molar ratio of 2-amino-5-methylpyridine, 1,4-naphthalenedicarboxylic acid, and zinc nitrate hexahydrate is 1:1 - 4:1 - 2; the reaction temperature is 100 - 110 °C, and the reaction time is 3 - 5 h.

[0016] Preferably, in step 2), the suction filtration time after the reaction is 0.5–1 h; the drying temperature is 85–90 °C, and the drying time is 0.5–1 h.

[0017] Provide an application of the compound fertilizer containing the polycomplex rooting synergist as described above, which is used as the base fertilizer required for plant growth, and the optimal application rate is 35–40 kg / mu.

[0018] Preferably, in the above application, the plant is corn.

[0019] Compared with the prior art, the advantages of the present invention are as follows:

[0020] The present invention first synthesizes a novel polycomplex zinc rooting synergist containing a naphthalene ring by a simple reflux method, and no by-products are generated during the production process. The preparation process of this method is simple, and the solvent water can be reused. At the same time, the formula of the compound fertilizer is optimized and adjusted, with the characteristics of a scientific raw material formula and the effective components of different raw materials being fully integrated and complementary. At the same time, using diethylaminoethyl succinate to replace the traditional anti-caking oil agent for compound fertilizer improves the stress resistance of crops while having good water solubility, and reduces the disadvantages such as unstable production process caused by using poor-quality anti-caking oil. The polycomplex rooting synergist compound fertilizer prepared by the present invention has high use efficiency, low cost, and simple method, has high economic and social benefits and popularization value, can significantly promote the growth of crop roots, provides the trace elements required by plants, and has a significant effect on improving the quality of crops. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following further describes the present invention in detail with reference to the drawings and embodiments:

[0022] Figure 1 It is the asymmetric unit structure diagram of the polycomplex rooting synergist prepared in Example 1.

[0023] Figure 2 It is the comparison diagram of the powder X-ray diffraction curve and the single crystal data simulation curve of the polycomplex rooting synergist prepared in Example 1. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Example 1

[0026] (I) Preparation method of polycomplex rooting synergist

[0027] Weigh 297.49 g (1.00 mol) of zinc nitrate hexahydrate, 108.14 g (1.00 mol) of 2-amino-5-methylpyridine, and 216.19 g (4.00 mol) of 1,4-naphthalenedicarboxylic acid, add them to a 2500 mL round-bottom flask, then add 1000 mL of deionized water, adjust the pH to 9, continue stirring for 30 min and then heat, react at a constant temperature of 110 °C for 4 h. After the reaction is completed and cooled to room temperature, filter by suction, dry at 90 °C for 1 h to obtain 379.50 g of yellow powder, with a yield of 97.89% (the yield is calculated based on Zn). Take 0.10 g of the yellow powder and dissolve it in a mixture of 5 mL of dichloromethane and ethanol (volume ratio 1:1), and use the slow evaporation method to obtain yellow block crystals for standby.

[0028] (II) Determination of the structure of the polycomplex rooting synergist:

[0029] Take the above colorless block crystals on a Bruker D8 X-ray diffractometer using graphite monochromatization radiation as the diffraction light source to collect the diffraction intensity data of the single crystal. After reducing the data, the structure of the polycomplex rooting synergist is as Figure 1 shown, Figure 1 showing the coordination environment of the metal Zn(II) ion. The Zn(II) ion exhibits a pentacoordinate coordination mode, coordinating with the pyridine nitrogen atom in one 2-amino-5-methylpyridine ligand and the carboxyl oxygen atoms in four 1,4-naphthalenedicarboxylate anions to form a distorted square pyramid geometric configuration. The single crystal data table is shown in Table 1; use a Bruker D8 Advance X-ray powder diffractometer to conduct a powder diffraction experiment on the crystal. Graphite monochromatized CuKα radiation is used, with a wavelength solid detector, a step size of 0.02°, a step time of 0.1 sec, and a scanning range of 5° ≤ 2θ ≤ 50°. The powder X-ray diffraction pattern (Experimental) of the copper chloride-linked 4-iodopyrazole coordination compound prepared matches the single crystal data simulation diagram (Simulated) ( Figure 2 ).

[0030] Table 1

[0031]

[0032] (III) Preparation method of the polycomplex rooting synergist compound fertilizer

[0033] Accurately weigh 1 part of the polycomplex rooting synergist, 180 parts of potassium sulfate or potassium chloride, 240 parts of urea, 170 parts of monoammonium phosphate, 20 - 25 parts of trace elements, and 10 - 20 parts of water-soluble granulating agent. After pulverizing them separately, mix them evenly. Then granulate through a drum or a high tower. Finally, add 1 - 1.5 parts of anti-caking oil agent and 1 - 1.5 parts of anti-caking powder to obtain the compound fertilizer containing the polycomplex rooting synergist.

[0034] Example 2

[0035] Accurately weigh 0.7 part of the polycomplex rooting synergist, 180 parts of potassium sulfate or potassium chloride, 240 parts of urea, 170 parts of monoammonium phosphate, 20 - 25 parts of trace elements, and 10 - 20 parts of water-soluble granulating agent. After pulverizing them separately, mix them evenly. Then granulate through a drum or a high tower. Finally, add 1 - 1.5 parts of anti-caking oil agent and 1 - 1.5 parts of anti-caking powder to obtain the compound fertilizer containing the polycomplex rooting synergist.

[0036] Example 3

[0037] Accurately weigh 1.2 parts of the polycomplex rooting synergist, 180 parts of potassium sulfate or potassium chloride, 240 parts of urea, 170 parts of monoammonium phosphate, 20 - 25 parts of trace elements, and 10 - 20 parts of water-soluble granulating agent. After pulverizing them separately, mix them evenly. Then granulate through a drum or a high tower. Finally, add 1 - 1.5 parts of anti-caking oil agent and 1 - 1.5 parts of anti-caking powder to obtain the compound fertilizer containing the polycomplex rooting synergist.

[0038] Example 4

[0039] Accurately weigh 1 part of the polycomplex rooting synergist, 190 parts of potassium sulfate or potassium chloride, 250 parts of urea, 170 parts of monoammonium phosphate, 20 - 25 parts of trace elements, and 10 - 20 parts of water-soluble granulating agent. After pulverizing them separately, mix them evenly. Then granulate through a drum or a high tower. Finally, add 1 - 1.5 parts of anti-caking oil agent and 1 - 1.5 parts of anti-caking powder to obtain the compound fertilizer containing the polycomplex rooting synergist.

[0040] Example 5

[0041] Accurately weigh 1 part of the polycomplex rooting synergist, 190 parts of potassium sulfate or potassium chloride, 240 parts of urea, 175 parts of monoammonium phosphate, 20 - 25 parts of trace elements, and 10 - 20 parts of water-soluble granulating agent. After pulverizing them separately, mix them evenly. Then granulate through a drum or a high tower. Finally, add 1 - 1.5 parts of anti-caking oil agent and 1 - 1.5 parts of anti-caking powder to obtain the compound fertilizer containing the polycomplex rooting synergist.

[0042] Example 6

[0043] Rapid verification test during the seedling stage of corn: After disinfecting corn seeds, place them in a petri dish lined with filter paper. Moisten a clean sterile cotton ball and place it on the filter paper, then add 20 mL of sterile water to keep the seeds moist. Next, place the petri dish in an incubator at a constant temperature of 28°C to ensure normal germination of the seeds. After the seeds germinate, select corn seedlings with the same growth vigor and transplant them into a seedling tray. When the first true leaf begins to unfold, apply the polycomplex rooting synergistic compound fertilizer diluted 1000 times with the samples in Examples 1-5 by irrigation (wherein, for the control CK group, the other components are the same as in Example 1 without adding the polycomplex rooting synergistic agent). After 14 days, measure data such as plant height and net weight.

[0044] Table 2 Statistical data of the results of corn root-promoting tests at different concentrations

[0045] Sample Name Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 CK Average Plant Height (cm) 32.53 31.76 31.43 32.13 31.98 28.98 Average Stem Diameter (mm) 3.19 3.20 3.19 3.19 3.20 3.17 Average Root Length (cm) 22.19 21.59 21.55 21.98 21.87 19.35 Total Net Weight (g) 24.52 24.10 24.10 24.38 24.23 20.11 Total Net Weight of Roots (g) 4.42 4.20 4.17 4.38 4.29 3.80

[0046] Analysis of experimental results: It can be seen from Table 2 that the polycomplex rooting synergistic compound fertilizer increased the average plant height of corn by 8.45% compared with the control plant height, but had a relatively small impact on the average stem diameter of corn. From the comparison results of the average root length, total root net weight, and total net weight data of corn plants with the control group, it can be known that the polycomplex rooting synergistic compound fertilizer significantly increased the plant height, stem diameter, and total net weight of corn plants. Among them, the effect of Sample 1 was the best. Compared with the control data, the average root length of corn plants increased by 14.67%, the total net weight increased by 21.93%, and the total root net weight increased by 16.31%. Therefore, it can be concluded that the polycomplex rooting synergistic compound fertilizer of the present invention can be used as a fertilizer required for promoting root growth. Considering the cost comprehensively, the dosage per mu is 35-40 kg.

[0047] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A compound fertilizer containing a poly-complex rooting synergist, characterized in that, By weight, it includes 0.7 - 1.2 parts of polycomplex root-promoting synergist, 180 - 190 parts of potassium sulfate or potassium chloride, 240 - 250 parts of urea, 165 - 175 parts of monoammonium phosphate, 20 - 25 parts of trace elements, 10 - 20 parts of water-soluble granulating agent, 1 - 1.5 parts of anti-caking oil agent and 1 - 1.5 parts of anti-caking powder.

2. The compound fertilizer containing the polycomplex rooting synergist according to claim 1, characterized in that, The molecular formula of the poly-complex rooting synergist is [Zn(C6H8N2)(C 12 H6O4)] n , and the structural formula is as follows:

3. The compound fertilizer containing the poly-complex rooting synergist according to claim 1, characterized in that, The crystal form of the polycomplex root-promoting synergist is monoclinic system, and the space group is P 21 / c.

4. The compound fertilizer containing the poly-complex rooting synergist according to claim 1, characterized in that, The trace elements are manganese sulfate or zinc sulfate, the water-soluble granulating agent is anhydrous magnesium sulfate, the anti-caking oil agent is diethylaminoethanol succinate, and the anti-caking powder is polyvinyl alcohol.

5. A method for preparing a compound fertilizer containing a poly-complex rooting synergist as described in claim 1, characterized in that, Weigh the polycomplex root-promoting synergist, potassium sulfate or potassium chloride, urea, monoammonium phosphate, trace elements, and water-soluble granulating agent by weight, crush and mix them evenly, then granulate, and finally add the anti-caking oil agent and anti-caking powder to obtain the compound fertilizer containing the polycomplex root-promoting synergist.

6. The preparation method of the compound fertilizer containing the poly-complex rooting synergist according to claim 5, characterized in that, The preparation method of the polycomplex root-promoting synergist includes the following steps: 1) Using 2-amino-5-methylpyridine, 1,4-naphthalenedicarboxylic acid, and zinc nitrate hexahydrate as raw materials, in a certain proportion, using water as a solvent, adjusting the pH value to 9, heating and refluxing at a certain temperature for a certain time; 2) After the reaction is completed, filter the product for a certain time; 3) Finally, dry at a certain temperature for a certain time to obtain the polycomplex root-promoting synergist.

7. The preparation method of the compound fertilizer containing the poly-complex rooting synergist according to claim 6, characterized in that, In the step 1), the molar ratio of 2-amino-5-methylpyridine, 1,4-naphthalenedicarboxylic acid, and zinc nitrate hexahydrate is 1:1 - 4:1 - 2; the reaction temperature is 100 - 110 °C, and the reaction time is 3 - 5 h.

8. The preparation method of the compound fertilizer containing the poly-complex rooting synergist according to claim 6, characterized in that, In the step 2), the filtering time after the reaction is completed is 0.5 - 1 h; the drying temperature is 85 - 90 °C, and the drying time is 0.5 - 1 h.

9. Use of the compound fertilizer containing the poly-complex rooting synergist according to any one of claims 1-4, characterized in that, It is used as the basal fertilizer required for promoting plant growth, and the optimal application rate is 35 - 40 kg / mu.

10. Use of the compound fertilizer containing a poly-complex rooting synergist according to claim 9, characterized in that, The plant is corn.

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