Preparation method of chitosan multilayer coated wheat slow-release fertilizer

Abstract

The invention relates to a preparation method of a chitosan multilayer coated wheat slow-release fertilizer. The preparation method comprises the following steps: uniformly mixing a fertilizer and auxiliary materials, adding into an acetic acid solution of chitosan, stirring until complete dissolution, and adding into a glutaraldehyde mixed solution of sodium alginate in a dropwise manner to formparticles with an inner coating layer; humidifying the particles with the inner coating layer, adding a chitosan outer coating material, uniformly coating the outer layer of the particles with the inner coating layer with the chitosan outer coating material to obtain particles with the outer coating layer, and finally drying, polishing and sieving to obtain the multilayer coated slow-release fertilizer. The multilayer coated slow release fertilizer prepared by the invention has slow / controlled release function, stably provides nutrition elements in a certain period of crop growth, completely provides fertilizer efficiency, reduces fertilizer loss, reduces the fertilization cost in crop planting, slows down soil degradation, and improves the quality and the yield of crops; and more importantly chitosan has good self-degradation function, does not cause any pollution to soil, and conforms to the concept of sustainable development.

Description

technical field [0001] The invention relates to the technical field of pesticide and waste preparation, in particular to a preparation method of chitosan-coated wheat slow-release fertilizer. Background technique [0002] Wheat is one of the most important food crops in the world. It is rich in starch, protein and fat, and is also an important source of energy for the human body. About one-third of the world's population uses wheat as a staple food. Countries with high wheat yields in the world include France, Germany, the United Kingdom, the Netherlands, Denmark, etc., with a yield level of 6500-8200kg / hm 2 , about 2.5-3.0 times the world average yield. In my country, wheat is the second largest food crop after rice. According to the region and production layout, the main production areas are divided into northeast spring wheat area, northwest wheat area, north China winter wheat area, winter wheat area in the middle and lower reaches of the Yangtze River and southwest whe...

AI Technical Summary

Problems solved by technology

[0003] The growth period of wheat is divided into the emergence period, tillering period, jointing period, booting period, heading period, flowering period, filling period and maturity period. The total growth period is long, so the demand for nutrients is also large and lasting , so in the process of wheat planting, according to the conventional method, it needs to be topdressed many times, which will increase the planting cost; and if the amount of fertilizer is not properly controlled for topdressing, it will not only fail to achieve high yield, but also may pollute the soil, resulting in the decline of soil organic matter, compaction and Acidification, destroying soil ecosystem

[0004] In response to the above problems, more and more slow-release fertilizers have been developed. Although simple slow-release fertilizers can achieve long-term release of fertilizers to a certain extent, in order to make them have a better slow-release effect, the coating used Most of the materials are difficult to self-degrade, which is not only costly, but also easily causes soil pollution, which is not conducive to sustainable development