Method for preparing chitosan slow-release fertilizer by using spray-drying method

Abstract

The invention discloses a method for preparing a chitosan slow-release fertilizer by using a spray-drying method. The method comprises the following steps: (1) dissolving chitosan, namely, adding 0.5-1g of chitosan with the deacetylation degree mass percentage greater than 88% into 100ml of water, simultaneously adding 0.5-1ml of acetic acid, stirring for 30 minutes so as to prepare a chitosan acetic acid solution with the mass percentage of 0.51%; 2) preparing a fertilizer solution; 3) spray-drying, namely, drying the fertilizer-chitosan acetic acid solution by using a spray-drying technique so as to obtain powder, thereby obtaining fertilizer-chitosan powder, wherein the spray-drying conditions are that the air inlet temperature is 150-180 DEG C, the air outlet temperature is 60-90 DEG C; 4) pelleting; 5) packaging. The method has the technical effects that chitosan is taken as a substrate in which fertilizers such as urea, potassium nitrate and organic matters are wrapped, the prepared fertilizer is powder and can be further pelleted to form a granular fertilizer by using a pelleting machine, the release time of the fertilizer can be prolonged, the fertilizer efficiency is relatively long-lasting, fertilizer loss can be reduced, the environment pollution can be reduced, and chitosan can improve the anti-disease property of plants and can effectively improve the conditions of soil.

Description

technical field [0001] The invention belongs to the field of preparation of agricultural slow-release fertilizers, in particular to a method for preparing chitosan slow-release fertilizers by spray drying. Background technique [0002] Chitosan is obtained by deacetylation of chitin that exists widely in nature. Its chemical name is polyglucosamine (1-4)-2-amino-B-D glucose, and its stock in nature is second only to cellulose. Chitosan is a natural polymer compound with a unique chemical structure, non-toxic and harmless, it has good biocompatibility, biodegradability, film-forming, antibacterial and other excellent properties. [0003] As a large agricultural country in the world, my country uses a lot of fertilizers in agricultural production. At present, the absorption rate of chemical fertilizers generally does not exceed 20%. The adverse consequences of traditional fertilizers are showing up in agricultural production, such as soil compaction, fertilizer absorption and ...

AI Technical Summary

Problems solved by technology

[0003] As a large agricultural country in the world, my country uses a lot of fertilizers in agricultural production. At present, the absorption rate of chemical fertilizers generally does not exceed 20%. The adverse consequences of traditional fertilizers are showing up in agricultural production, such as soil compaction, fertilizer absorption and utilization rate Low, pollute the environment, lead to eutrophication of water bodies, etc.