Film coated control releasing regetable special fertilizer and its producing method

Abstract

The present invention discloses coated release controlling fertilizer for vegetable and its production process. The coating layer consists of PVA, PVP, talcum powder, inhibitor and water. Under certain technological conditions, the granular composite fertilizer is coated to form the release controlling fertilizer with release control of nitrogen fertilizer, phosphate fertilizer and potash fertilizer, both coating and inhibiting function, degradable coating and soil improving function. The fertilizer effect period may reach 80-100 days, and once fertilizer application may meet the nutrients requirement in whole growth period of vegetable. The present invention has less fertilizer loss, high fertilizer utilization, effectively lowered nitrate content in vegetable, degradation of the coating within 100 days into no-toxic matter, and effective improvement of soil structure.

Description

technical field [0001] The invention relates to a coated slow-controlled release fertilizer, in particular to a special coated slow-controlled release vegetable fertilizer and a preparation method thereof. Background technique [0002] At present, due to the excessive use of common chemical fertilizers in vegetables, the nitrate content is seriously exceeded, which seriously endangers human health. There is an urgent need for a slow and controlled release fertilizer for vegetable production. In order to improve the utilization rate of fertilizers, the development of coated fertilizers has been carried out at home and abroad, but there is no coated controlled-release fertilizer specially used for vegetable production. The main representative patents are: U.S. Patent (US 4 801498. CA110: 137178) The film layer material of the coated fertilizer is composed of a copolymer resin of ethylene and methacrylic acid. Japanese patent (1279683) (1985) patent discloses a kind of film-co...

AI Technical Summary

Problems solved by technology

Other film materials used for coating fertilizers include: waxes obtained by treating rosin with toluene and sulfuric acid, copolymers of alkyd resins and unsaturated oil esters, polyurea urethanes and isocyanates, etc. The meaning is coated slow-release (long-acting) fertilizer, which only prolongs the fertilizer effect through the thickness and density of the film layer, but cannot effectively control the release of fertilizer nutrients

At present, the coating materials used in the development of coated fertilizers in my country include inorganic materials such as phosphate rock powder used in Chinese patent ZL 95109720.2. The density is not enough, the pore diameter of the coating layer is greater than 10m, and the film layer is easy to break, and the slow-release effect is poor. , other patent publications have introduced the use of urea-formaldehyde resin, waste plastics, shellac, rosin, carboxymethyl cellulose to wrap the coated fertilizer with urea as the core, but the general production process is complicated, although it has achieved a certain effect of prolonging the fertilizer effect, but Can not effectively control the release of fertilizer nutrients, and mainly to prolong the release of nitrogen nutrients, can not take into account the release of phosphorus and potassium nutrients