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Coated synergistic nitrogen fertilizer composition and preparation method thereof

A composition and nitrogen fertilizer technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve problems such as insufficient utilization rate of slow-release chemical fertilizers, achieve precise and controllable nutrient release rate and quantity, promote development, and strengthen disease resistance. Effect

Inactive Publication Date: 2013-01-16
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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  • Abstract
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Problems solved by technology

The slow-release chemical fertilizer provided by the invention has deficiencies in fertilizer utilization efficiency and the like

Method used

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Embodiment Construction

[0060] For better illustrating the present invention, facilitate understanding technical scheme of the present invention, typical but non-limiting embodiment of the present invention is as follows:

[0061] The preparation method of the film-coated synergistic nitrogen fertilizer composition of the present invention comprises the following steps:

[0062] 1) Preparation of γ-polyglutamic acid: Bacillus subtilis is used as the strain to obtain γ-polyglutamic acid through liquid batch fermentation, and γ-polyglutamic acid crystals are obtained through separation and purification technology, and its molecular weight is 10 Between ~2 million Daltons;

[0063] 2) Mix γ-polyglutamic acid with water to obtain a γ-polyglutamic acid solution; take γ-polyglutamic acid crystals, add them to water while stirring, keep the temperature at 75~90°C, and oscillate at a frequency of 50Hz After shaking on the machine for 1~1.5h, cool at room temperature to obtain an aqueous solution of γ-polygl...

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Abstract

The invention relates to a coated synergistic nitrogen fertilizer composition and a preparation method thereof. The nitrogen fertilizer composition contains 0.01-30.0 percent of gamma-polyglutamic acid. The preparation method of the nitrogen fertilizer composition comprises the following steps of: adding water into the gamma-polyglutamic acid and mixing to obtain gamma-polyglutamic acid solution; adding an auxiliary agent into the gamma-polyglutamic acid solution to obtain gamma-polyglutamic acid coating solution; and uniformly spraying the gamma-polyglutamic acid solution to nitrogen fertilizer particles to uniformly mix, then drying and quantitatively packaging to obtain a finished product. According to the product, the release time of the fertilizer in soil is about 4 times longer than that of the conventional fertilizer, the using amount of the fertilizer can be directly reduced by over 20 percent, and the cost is saved on the basis of guaranteeing the yield of crops.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a coating-type synergistic nitrogen fertilizer composition capable of reducing environmental pollution, promoting crop nutrient absorption, and improving fertilizer utilization rate and a preparation method thereof. Background technique [0002] 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 enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 张树清张文刘培京
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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