Adhesive controlled release fertilizer and preparation method thereof

Abstract

The invention provides an adhesive controlled release fertilizer and a preparation method thereof. The adhesive controlled release fertilizer consists of the following components in percentage by weight: 4 to 10 percent of pregelatinized starch, 2 to 4 percent of tung oil, 3 to 6 percent of disproportionated rosin, 7 to 15 percent of attapulgite powder, 0 to 15 percent of lignosulfonate, 0 to 15 percent of weathered coal, 0 to 6 percent of polyvinyl alcohol, 0 to 6 percent of carboxy methyl cellulose, and the balance of fertilizer. The preparation method comprises the following steps of: adding water which is 10 to 20 percent based on the total weight of the materials into the fertilizer to ensure that partial fertilizer is dissolved; adding an adhesive material with stirring in the process of heating until the solution is boiling; fully mixing uniformly, continuously stirring to ensure that the mixture is dried till the moisture is less than 10 percent; and granulating by using a granulator, or melting the mixture for spraying granulation. The adhesive controlled release fertilizer can release the fertilizer nutrient releasing speed to improve the nutrient utilization rate, the production process is simple, and the production cost is relatively low.

Description

technical field [0001] The invention belongs to the technical field of slow / controlled release fertilizers in fertilizer science, and in particular relates to an adhesive type controlled release fertilizer and a preparation method thereof. Background technique [0002] In recent decades, the world's fertilizer consumption has been increasing, consuming a large amount of non-renewable resources. However, the fertilizer utilization rate of fertilizer is still low, nitrogen fertilizer utilization rate is only 40%-60% (20%-40% in paddy field), phosphorus fertilizer is 10%-20%, and potassium fertilizer is 40%-60%. The utilization rate of fertilizers in my country is relatively low, 30%-35%, 10%-25% and 35-50% respectively. About half of the fertilizers applied every year are lost by various means, causing huge economic losses. Losses and waste of resources, what's more, the lost fertilizers have caused problems such as water pollution, agricultural product pollution and atmospher...

AI Technical Summary

Problems solved by technology

[0006] However, although the research on controlled-release fertilizers has made great progress, there are still many deficiencies, especially the complex production process, high production costs, and the difficulty of degrading some controlled-release materials. For more than a century, the commercialization of controlled-release fertilizers has made little progress, and their market share is still very small, accounting for only 1% of the amount of chemical fertilizers. They are mainly used in non-agricultural fields with relatively high economic value such as flowers, lawns, and nurseries. , limiting the widespread use of these fertilizers on various field crops