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Preparation method and use method of chitosan oligosaccharide coated slow-release fertilizer

A technology of coated slow-release and chitosan oligosaccharides, which is applied in the direction of layered/coated fertilizers, fertilizer mixtures, solid/semi-solid fertilizers, etc., can solve problems such as shedding, difficult application, and difficult fixation, and achieve low production costs. Good sustained release effect, simple process effect

Active Publication Date: 2021-01-01
STANLEY FERTILIZER (PINGYUAN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no method to apply oligochitosaccharides and coating slow-release agents to fertilizers at the same time. Even if the two are applied to fertilizers in combination, there are two problems: 1. The surface of the coated fertilizer has the problem that it is not easy to be fixed and falls off; 2. Add the chitosan oligosaccharide to the coated slow-release agent and spray it on the surface of the fertilizer, which will cause the chitosan oligosaccharide to be wrapped by the coating and affect the shell The release of oligosaccharides in the early stage will affect the use effect of chitosan oligosaccharides, which is unsatisfactory
[0004] At present, the preparation of chitosan oligosaccharides is usually achieved by degrading chitosan. The use of hydrogen peroxide and organic acids to degrade chitosan to prepare chitosan has the advantage of low cost. However, hydrogen peroxide and organic acids are used to degrade chitosan. Chitosan oligosaccharides are used in agriculture, but there are problems of unstable effects, and even phytotoxicity sometimes occurs, which makes it difficult to prepare chitosan oligosaccharides in agriculture by synergistically degrading chitosan with hydrogen peroxide and organic acids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of chitosan oligosaccharide-coated slow-release urea is to spray the self-made coating slow-release agent containing chitosan oligosaccharide on the surface of large particle urea, and after drying, chitosan oligosaccharide-coated slow-release urea is obtained; the drying time for 30 minutes, and the water content of oligochitosan-coated slow-release urea is 0.4%;

[0038] The mass ratio of the coated slow-release agent containing chitosan oligosaccharide to the fertilizer is 3:97.

[0039] The preparation and application method of self-made chitosan oligosaccharide coated slow-release fertilizer is carried out according to the following steps

[0040] 1) Mix chitosan, maleic acid, hydrogen peroxide and water in a container to obtain acid-decomposed chitosan;

[0041] 2) Add 30% concentration of acrylamide monomer to the acid-solvable chitosan oligosaccharide;

[0042] 3) Nitrogen is passed into the acid-decomposed chitosan oligosaccharide; the ...

Embodiment 2

[0054] The preparation method of chitosan oligosaccharide-coated slow-release urea is to spray the self-made coating slow-release agent containing chitosan oligosaccharide on the surface of large particle urea, and after drying, chitosan oligosaccharide-coated slow-release urea is obtained; the drying time 30min; Chitosan oligosaccharide-coated slow-release urea moisture is 0.4%.

[0055] The mass ratio of the coated slow-release agent containing chitosan oligosaccharide to the fertilizer is 3:97.

[0056] The preparation and application method of self-made chitosan oligosaccharide coated slow-release fertilizer is carried out according to the following steps

[0057] 1) Mix chitosan, maleic acid, hydrogen peroxide and water in a container to obtain acid-decomposed chitosan;

[0058] 2) Nitrogen gas is passed into the acid-decomposed chitosan oligosaccharide; the oxygen content in the acid-decomposed chitosan oligosaccharide is lower than 10 μg;

[0059] 3) Add sodium hydrox...

Embodiment 3

[0071] The preparation method of chitosan oligosaccharide-coated slow-release fertilizer is to spray the self-made coating slow-release agent containing chitosan oligosaccharide on the surface of the fertilizer, and after drying, the chitosan oligosaccharide-coated slow-release fertilizer is obtained; the drying time is 25min ; The moisture content of the chitosan oligosaccharide-coated slow-release fertilizer is 1.5%.

[0072] The fertilizer is a 20-10-10 compound fertilizer; the mass ratio of the coated slow-release agent containing chitosan oligosaccharide to the fertilizer is 2:98.

[0073] The preparation and application method of self-made chitosan oligosaccharide coated slow-release fertilizer is carried out according to the following steps

[0074] 1) Mix chitosan, maleic acid, hydrogen peroxide and water in a container to obtain acid-decomposed chitosan;

[0075] 2) Nitrogen gas is passed into the acid-decomposed chitosan oligosaccharide; the oxygen content in the ac...

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Abstract

The invention relates to a preparation and use method of a chitosan oligosaccharide coated slow-release fertilizer, which comprises the following steps: spraying a chitosan oligosaccharide-containingcoated slow-release agent on the surface of the fertilizer, and drying to obtain the chitosan oligosaccharide coated slow-release fertilizer. The method is characterized in that the drying time rangesfrom 20 min to 45 min. The slow-release fertilizer can promote crop growth, has a certain disease prevention effect and also has a very good slow-release effect.

Description

technical field [0001] The invention relates to a preparation and application method of chitosan oligosaccharide-coated slow-release fertilizer. Background technique [0002] Oligochitosan has good water solubility, and its application in agriculture can promote crop growth and induce plant disease resistance. It has a good development prospect in agriculture. Oligochitosan is applied to the roots and is usually used for soaking seeds or transplanting seedlings. In the middle and late stages of plant growth, as the plants tend to mature, the effect of promoting plant growth is not obvious at this time, and the plants may even become green Late maturity, in terms of inducing disease resistance, and at this time the plants already have high disease resistance, the effect of inducing disease resistance is not obvious at this time. [0003] The coated slow-release fertilizer can effectively prolong the release time of the fertilizer, so that the release of fertilizer nutrients ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/40C05G3/90C05G5/12C05G5/30
CPCC05G3/40C05G3/90C05G5/12C05G5/30C05C9/00
Inventor 褚刚张浩王金环
Owner STANLEY FERTILIZER (PINGYUAN) CO LTD
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