A compound fertilizer containing polycomplex rooting synergist, its preparation method and application

Abstract

The present application relates to the technical field of fertilizer, and particularly provides a compound fertilizer containing polycomplex rooting synergist, and a preparation method and application thereof.The compound fertilizer comprises polycomplex rooting synergist, potassium sulfate or potassium chloride, urea, monoammonium phosphate, trace elements, water-soluble granulating agent, anti-compaction oil agent and anti-compaction powder agent.The present application is green and environmentally friendly, and no three wastes are generated during production, the yield of polycomplex rooting synergist is high, and the polycomplex rooting synergist is granulated with monoammonium phosphate, urea and other raw materials through a roller or a high tower, so that the method is simple, and the production cost is low.The compound fertilizer containing polycomplex rooting synergist prepared by the present application can significantly improve the root length, root net weight and total net weight of plants.The product has the advantages of good water solubility, high use efficiency and high added value, 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 application relates to the technical field of fertilizers, and particularly provides a compound fertilizer containing a polycomplex rooting synergist and a preparation method and application thereof, which can effectively improve the yield and quality of crops, reduce pollution and damage to the environment, and provide strong support for the sustainable development of agricultural production. BACKGROUND

[0002] As is known to all, with the enhancement of people's environmental protection consciousness, the traditional compound fertilizer industry is gradually abandoning the production mode of high pollution and high energy consumption, and turning to the production mode of functionalization, greenization, individualization and sustainability. Rooting type functional compound fertilizer, as an environmentally friendly and efficient fertilizer, has the advantages of significantly promoting the growth and development of plant roots, improving crop resistance and yield, etc., and meets the development requirements of green agriculture and ecological agriculture. In order to improve the production efficiency and product quality of rooting compound fertilizer, scientists are constantly optimizing and improving the production process and formula of 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 disadvantages such as not obvious rooting effect and short action period.

[0003] When the rooting type compound fertilizer is used in excess, especially the fertilizer containing hormone rooting agent, it may destroy the hormone balance inside the plant, leading to problems such as early decline and abnormal fruit of crops, thereby affecting the quality and yield of crops. According to the legal regulations of our country, it is prohibited to add hormone drugs to fertilizers, otherwise it will be treated as false fertilizer and punished. In addition, the use of unreasonable rooting type compound fertilizer formula will also lead to insufficient supply of soil nutrients, and excessive root growth will limit the growth of crops. Therefore, when using rooting type compound fertilizer, the formula and application amount need to be strictly adjusted to ensure that the crops are supplied with comprehensive nutrients. Compared with traditional fertilizers, the production cost of rooting type compound fertilizer is usually higher, which brings economic pressure to farmers using rooting type compound fertilizer. To solve this problem, new rooting synergists can be developed to manufacture rooting type compound fertilizers suitable for different crops with pertinence and applicability by strictly adjusting the proportion of different nutrient elements. This also helps to provide more scientific fertilization guidance for agricultural production, and improve the utilization rate of fertilizers and crop yield. SUMMARY

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

[0005] This invention is achieved by providing a compound fertilizer containing a complex-forming rooting synergist, comprising, by weight, 0.7–1.2 parts of the complex-forming 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 agent.

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

[0007]

[0008] Preferably, the aggregated rooting synergist has a monoclinic crystal system and a space group of 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 agent is polyvinyl alcohol.

[0010] A method for preparing the compound fertilizer containing the aggregated rooting synergist is provided. The aggregated rooting synergist, potassium sulfate or potassium chloride, urea, monoammonium phosphate, trace elements, and water-soluble granulating agent are weighed according to the weight parts, pulverized and mixed evenly, then granulated, and finally anti-caking oil agent and anti-caking powder agent are added to obtain the compound fertilizer containing the aggregated rooting synergist.

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

[0012] 1) Using 2-amino-5-methylpyridine, 1,4-naphthalenedicarboxylic acid and zinc nitrate hexahydrate as raw materials, water is used as solvent in a certain proportion, the pH value is adjusted to 9, and the mixture is heated to reflux at a certain temperature for a certain time.

[0013] 2) After the reaction is complete, filter the product for a certain period of time;

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

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

[0016] Preferably, in step 2), the filtration 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.

[0017] This invention provides an application of the compound fertilizer containing the aggregated rooting synergist, used as a base fertilizer to promote plant growth, with an optimal application rate of 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] This invention first synthesizes a novel polycyclic zinc rooting synergist containing naphthalene rings using a simple reflux method, without generating byproducts during production. This method is simple to prepare and the solvent water can be reused. Simultaneously, the compound fertilizer formula is optimized, featuring a scientifically formulated raw material composition and the full integration and complementarity of the effective components of different raw materials. Furthermore, by using diethylaminoethanol succinate to replace the traditional compound fertilizer anti-caking oil agent, crop stress resistance is improved while maintaining good water solubility, reducing the instability in the production process caused by using poor-quality anti-caking oil. The polycyclic rooting synergist compound fertilizer prepared by this invention has high efficiency, low cost, and a simple method, possessing significant economic and social benefits and promotional value. It can significantly promote crop root growth, provide the micronutrients required by plants, and significantly improve crop quality. Attached Figure Description

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 The diagram shows the asymmetric unit structure of the aggregated rooting synergist prepared in Example 1.

[0023] Figure 2 The image shows a comparison between the X-ray diffraction curve of the aggregated rooting synergist powder prepared in Example 1 and the simulated curve of single crystal data. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0025] Example 1

[0026] (I) Preparation method of aggregated 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, and add them to a 2500 mL round-bottom flask. Then add 1000 mL of deionized water to adjust the pH to 9. Continue stirring for 30 min, then heat to a constant temperature of 110 °C for 4 h. After the reaction is complete, cool to room temperature, filter, and dry at 90 °C for 1 h to obtain 379.50 g of yellow powder, with a yield of 97.89% (yield calculated as Zn). Dissolve 0.10 g of the yellow powder in 5 mL of a mixture of dichloromethane and ethanol (volume ratio 1:1), and obtain yellow blocky crystals by slow evaporation for later use.

[0028] (II) Determination of the structure of aggregated rooting synergists:

[0029] The above colorless bulk crystals were monochromated using a Bruker D8 X-ray diffractometer. Radiation was used as the diffraction source to collect diffraction intensity data of the single crystal. The reduced data yielded the structure of the aggregated rooting synergist, as shown below. Figure 1 As shown, Figure 1 This demonstrates the coordination environment of the Zn(II) ion. The Zn(II) ion exhibits a five-coordinate mode, coordinating with the pyridine nitrogen atom in a 2-amino-5-methylpyridine ligand and the carboxyl oxygen atoms in four 1,4-naphthalenedicarboxylic acid anions. The crystal forms a twisted, pyramidal geometry, and its single-crystal data is shown in Table 1. Powder diffraction experiments were performed on the crystal using a Bruker D8 Advance X-ray powder diffractometer. Graphite monochromatic CuKα radiation was used, with a wavelength of... A solid-state detector was used with a step size of 0.02°, a step time of 0.1 sec, and a scan range of 5°≤2θ≤50°. The powder X-ray diffraction pattern (experimental) of the prepared copper chloride-linked 4-iodopyrazole coordination compound matched the simulated pattern from single-crystal data. Figure 2 ).

[0030] Table 1

[0031]

[0032] (III) Preparation method of compound fertilizer with aggregated rooting synergist

[0033] Accurately weigh 1 part of the aggregated 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. Crush each component separately and mix them thoroughly. Then granulate using a drum or high-tower granulator. Finally, add 1-1.5 parts of anti-caking oil agent and 1-1.5 parts of anti-caking powder agent to obtain a compound fertilizer containing the aggregated rooting synergist.

[0034] Example 2

[0035] Accurately weigh 0.7 parts of the aggregated 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. Crush each component separately and mix them thoroughly. Then granulate using a drum or high-tower granulator. Finally, add 1-1.5 parts of anti-caking oil agent and 1-1.5 parts of anti-caking powder agent to obtain a compound fertilizer containing the aggregated rooting synergist.

[0036] Example 3

[0037] Accurately weigh 1.2 parts of the aggregated 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. Crush each component separately and mix them thoroughly. Then granulate using a drum or high-tower granulator. Finally, add 1-1.5 parts of anti-caking oil agent and 1-1.5 parts of anti-caking powder agent to obtain a compound fertilizer containing the aggregated rooting synergist.

[0038] Example 4

[0039] Accurately weigh 1 part of the aggregated 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. Crush each component separately and mix them thoroughly. Then granulate using a drum or high-tower granulator. Finally, add 1-1.5 parts of anti-caking oil agent and 1-1.5 parts of anti-caking powder agent to obtain a compound fertilizer containing the aggregated rooting synergist.

[0040] Example 5

[0041] Accurately weigh 1 part of the aggregated 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. Crush each component separately and mix them thoroughly. Then granulate using a drum or high-tower granulator. Finally, add 1-1.5 parts of anti-caking oil agent and 1-1.5 parts of anti-caking powder agent to obtain a compound fertilizer containing the aggregated rooting synergist.

[0042] Example 6

[0043] Rapid verification experiment during the corn seedling stage: After disinfection, corn seeds were placed in petri dishes lined with filter paper. A clean, sterile cotton swab was moistened and placed on the filter paper, and 20 mL of sterile water was added to keep the seeds moist. The petri dishes were then placed in a constant temperature incubator at 28°C to ensure normal seed germination. After germination, corn seedlings with similar growth were selected and transplanted into seedling trays. When the first true leaf appeared, a compound fertilizer containing a 1000-fold dilution of the rooting synergist from Examples 1–5 was applied as a root drench (the control group CK group was the same as in Example 1 without the rooting synergist). Plant height, net weight, and other data were measured 14 days later.

[0044] Table 2. Statistical analysis of the results of maize root-promoting experiments with 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 fresh weight (g) 24.52 24.10 24.10 24.38 24.23 20.11 Total root fresh weight (g) 4.42 4.20 4.17 4.38 4.29 3.80

[0046] Experimental Results Analysis: Table 2 shows that the aggregated rooting synergist compound fertilizer increased the average plant height of corn by 8.45% compared to the control, but had little effect on the average stem diameter. Comparison of the average root length, total root weight, and total net weight of corn plants with the control group shows that the aggregated rooting synergist compound fertilizer significantly increased the plant height, stem diameter, and total net weight of corn plants. Sample 1 showed the best effect; compared to the control, the average root length increased by 14.67%, the total net weight increased by 21.93%, and the total root weight increased by 16.31%. Therefore, it can be concluded that the aggregated rooting synergist compound fertilizer of this invention can be used as a fertilizer to promote root growth. Considering cost, the recommended dosage is 35–40 kg per acre.

[0047] The embodiments of the present invention have been described in detail above 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 skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A compound fertilizer containing a complex-like rooting synergist, characterized in that, By weight, it includes 0.7–1.2 parts of aggregated 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 water-soluble granulating agent, 1–1.5 parts of anti-caking oil agent and 1–1.5 parts of anti-caking powder agent; The molecular formula of the aggregated rooting synergist is [Zn(C6H8N2)(C 12 H6O4)] n The structural formula is: ； The aggregated rooting synergist has a monoclinic crystal system and a space group of [missing information]. P 21 / c ; 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 agent is polyvinyl alcohol.

2. A method for preparing a compound fertilizer containing a complex-like rooting synergist as described in claim 1, characterized in that, Weigh out the following ingredients according to weight: aggregated rooting synergist, potassium sulfate or potassium chloride, urea, monoammonium phosphate, trace elements, and water-soluble granulating agent. After crushing, mix them evenly, then granulate. Finally, add anti-caking oil agent and anti-caking powder agent to obtain a compound fertilizer containing aggregated rooting synergist. The preparation method of the aggregated rooting 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, with water as solvent, the pH value was adjusted to 9, and the mixture was heated to reflux at a certain temperature for a certain time. 2) After the reaction is complete, filter the product for a certain period of time; 3) Finally, dry at a certain temperature for a certain time to obtain the aggregated rooting synergist; In 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. o C, the reaction time is 3–5 h; In step 2), the filtration time after the reaction is complete is 0.5–1 h; the drying temperature is 85–90 °C. o C, drying time is 0.5–1 h.

3. The application of the compound fertilizer containing the aggregated rooting synergist according to claim 1, characterized in that, The optimal application rate for base fertilizer used to promote plant growth is 35–40 kg / acre.

4. The application of the compound fertilizer containing the aggregated rooting synergist according to claim 3, characterized in that, The plant in question is corn.

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