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Non-envelope controlled-release synergistic nitrogen fertilizer and preparation method thereof

A slow-release, non-encapsulated technology, applied in fertilization devices, fertilizer mixtures, agricultural gas emission reduction, etc., can solve the problem of short service life of granulator scrapers and orifice nets, and affect the adsorption of γ-polyglutamic acid Efficacy, affecting production continuity and efficiency, etc., to achieve the effect of improving soil water and fertilizer retention capacity, improving fertilizer utilization rate, and ensuring slow-release performance

Active Publication Date: 2013-01-23
WUZHOUFENG AGRI SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this granulation method is adopted, because the hardness of the material after rolling is high, it needs to be crushed at high temperature. This is because if the temperature of the material in the crushing process is low, the load of the crushing roller of the double-roll crusher will be too large, and the granulation The service life of the machine scraper and the perforated screen is very short and needs to be replaced frequently, which increases the production cost and affects the continuity and efficiency of production
Although this method of high-temperature crushing solves the problems of excessive load on the crushing roller and short service life of the granulator scraper and orifice mesh, it will also bring about the problem of excessively high proportion of powdery materials at high temperature
On the other hand, if this method is applied to the granulation of slow-release fertilizers containing γ-polyglutamic acid, it will also affect the adsorption efficiency of γ-polyglutamic acid, resulting in a decrease in the slow-release performance of the fertilizer

Method used

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  • Non-envelope controlled-release synergistic nitrogen fertilizer and preparation method thereof
  • Non-envelope controlled-release synergistic nitrogen fertilizer and preparation method thereof
  • Non-envelope controlled-release synergistic nitrogen fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take the preparation of 100kg non-coated slow-release synergistic nitrogen fertilizer as an example, 1kg of γ-polyglutamic acid, 1.0kg of zinc sulfate as an auxiliary agent, 0.5kg of thiourea as an auxiliary agent, and 1.5kg of calcium chloride as an auxiliary agent , 0.3kg of ferrous sulfate as an auxiliary agent, and the balance is ammonium chloride as a basic component. The preparation method is as follows:

[0042] 1) Preparation of γ-polyglutamic acid mixture: Weigh γ-polyglutamic acid and additives in proportion, and mix to obtain γ-polyglutamic acid mixture.

[0043] 2) Mix the powdery basic components with the γ-polyglutamic acid mixture obtained in step 1) (stir mixing or spray mixing), roll into a sheet by a roller press, and cool down to normal temperature.

[0044] 3) Use a special impact granulator for granulation.

[0045] like figure 1 , The special impact granulator of the present invention includes a container-shaped casing 1 with a feed inlet 2 at t...

Embodiment 2

[0064] Take the preparation of 100kg non-coated slow-release synergistic nitrogen fertilizer as an example, 0.8kg of γ-polyglutamic acid, 1.2kg of copper sulfate as auxiliary agent, 0.3kg of dicyandiamide as auxiliary agent, and calcium chloride as auxiliary agent 0.9kg, 0.3kg of acephate as auxiliary agent, and the balance is ammonium nitrate as basic component. The preparation method is the same as in Example 1. The preparation method is the same as in Example 1.

[0065] Table 2-1 and 2-2 show the comparative experimental data of the slow-release effect and yield-increasing effect of the non-coated slow-release synergistic nitrogen fertilizer prepared in this example.

[0066] Table 2-1: Hydrostatic release rate test at 25°C

[0067]

[0068] Experimental method: Weigh about 10.00 g of ordinary ammonium nitrate and the sample of Example 2, put them into a pouch made of 100-mesh nylon gauze, seal the pouch and put it into a 300ml plastic bottle, add 250ml of distilled w...

Embodiment 3

[0074] Take the preparation of 100kg non-coated slow-release synergistic nitrogen fertilizer as an example, 1.5kg of γ-polyglutamic acid, 0.6kg of calcium carbonate as an auxiliary agent, 0.6kg of cyanohydrin as an auxiliary agent, and 0.5 kg of calcium chloride as an auxiliary agent kg, 0.1 kg of boric acid as an auxiliary agent, and the balance as urea as a basic component. The preparation method is the same as in Example 1.

[0075] Table 3-1 and 3-2 show the comparative experimental data of the slow-release effect and yield-increasing effect of the non-coated slow-release synergistic nitrogen fertilizer prepared in this example.

[0076] Table 3-1: Hydrostatic release rate test at 25°C

[0077]

[0078] Experimental method: Weigh about 10.00 g of ordinary urea and the sample of Example 3, put them into a pouch made of 100-mesh nylon gauze, seal the pouch and put it into a 300ml plastic bottle, add 250ml of distilled water, seal it with a cap, Place them in a biochemical...

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Abstract

The invention relates to a non-envelope controlled-release synergistic nitrogen fertilizer and a preparation method thereof. The nitrogen fertilizer consists of the following components: 0.50-1.50% of gamma-polyglutamic acid, 0.3-1.5% of dissolution inhibitor, 0.3-0.6% of nitrification inhibitor, 0-1.5% of adsorbent, 0-0.6% of urease inhibitor and the balance of ammonium nitrogen fertilizer, nitrate nitrogen fertilizer or amide nitrogen fertilizer. According to the invention, the product is economical and environment-friendly, maintains water and fertilizer, can reduce the waste of nitrogen fertilizer, activates the nutrient element, and improves the utilization rate of the nitrogen fertilizer; and thus, the nutrients are slowly released, the application amount of the fertilizer is reduced, the environmental pollution caused by massive use of nitrogen fertilizer is avoided, and the cost of agricultural production is saved.

Description

[0001] technical field [0002] The invention relates to a slow-release nitrogen fertilizer and a preparation method thereof. Background technique [0003] my country's nitrogen fertilizer production and consumption rank first in the world, but the low fertilizer utilization rate is a major bottleneck restricting my country's agricultural development. According to the data, in 2011, the amount of nitrogen fertilizer applied in my country was 24 million tons. Due to the low utilization rate of fertilizer, the loss of nitrogen fertilizer through volatilization, leaching and runoff was huge. The direct loss of fertilizer was about 10 million tons, equivalent to about 34 billion yuan. At the same time, it will bring about the decline of soil fertility, the reduction of crop quality, and serious environmental pollution. Therefore, increasing the utilization rate of fertilizers and reducing the loss of fertilizers has received extensive attention from agricultural workers at home...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05G3/90
CPCY02P60/21
Inventor 张树清王学江张文刘金波
Owner WUZHOUFENG AGRI SCI & TECH
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