A kind of coated slow and controlled release fertilizer and its manufacturing method

Abstract

The invention discloses a coated slow and controlled release fertilizer, wherein the components constituting the coated slow and controlled release fertilizer are as follows: 80-85 parts of compound fertilizer, 5-7 parts of polymer water-absorbing resin, and 0.4-0.6 parts of polymer polysaccharide , 1-2 parts of inorganic coating ingredients, 5-7 parts of film-forming aids, 1.8-2.2 parts of plasticizers, and 0.8-1.2 parts of cross-linking agents; the production process of the invention is simple, effectively promotes growth, and the fertilizer release can be used in the range wider. In the film forming process of the present invention, organic thin film components (polymer water-absorbing resin) and inorganic thin film components are introduced, wherein the inorganic thin film components can chemically react with the organic thin film components to achieve rapid film formation at room temperature, and the thickness of the fertilizer coating and the thin film The strength can be controlled by the amount of spray film and the amount of added film-forming aids to achieve the consistency of fertilizer release rate and crop growth rate.

Description

Technical field: [0001] The invention relates to the technical field of agricultural slow-release fertilizers, in particular to coated slow-release fertilizers and a manufacturing method thereof. Background technique: [0002] In recent years, the extensive use of chemical fertilizers in agricultural production has caused a large number of economic losses and a series of environmental problems. First of all, high fertilization level leads to low fertilizer utilization rate. The seasonal utilization rate of chemical fertilizers in my country is generally low, nitrogen is about 30%-50%, phosphorus is about 10%-20%, and potassium is about 35%-50%. , resulting in a serious waste of resources and economic losses. Secondly, due to unreasonable fertilization, the soil structure is destroyed, the phenomenon of soil compaction, shallow plow layer, and poor water and fertilizer retention capacity is becoming more and more serious, which makes the production increase benefit of chemica...

AI Technical Summary

Problems solved by technology

Chinese patent 201310753674.4 discloses a biodegradable slow-release coating material containing soybean polyols, which needs to use highly toxic substance isocyanate in the film preparation process, and its environmental protection problems need to be solved

Aiming at the problems that the current production process of slow-controlled release fertilizer is complicated, the production cost is slightly high, and some production processes are not environmentally friendly, a kind of coated slow-controlled release fertilizer with simple production process and environmental protection and its manufacturing method are invented.