Functional slow-release fertilizer and production method thereof

Abstract

The invention discloses a functional slow-release fertilizer and a production method thereof. The slow-release fertilizer comprises core urea, a middle coating layer and an outer coating layer; the middle coating layer comprises the following raw material components: a silicon calcium potassium soil conditioner, magnesium sulfate and an organic silicon fertilizer; and the outer coating layer comprises the following raw material components: humic acid, phosphorus, potassium, quick-acting nitrogen and the like. The production method of the functional slow-release fertilizer comprises the following steps: adding a certain amount of urea into a pelletizer, spraying sulfuric acid while rolling, scattering a mixture of other raw material components except for the sulfuric acid in the middle coating layer, continuously rolling, spraying a proper amount of sulfuric acid, and alternately spraying the sulfuric acid and scattering a mixture of other raw material components except for the sulfuric acid in the outer coating layer to form nutrient proportion and granule size required by the fertilizer special for various crops. The utilization rate of the chemical fertilizer can be increased, waste of resources is reduced, pollution is reduced, soil is improved, the process is simple, the cost is low, and the middle coating layer and the outer coating layer can be degraded.

Description

technical field [0001] The invention relates to the technical field of fertilizers, in particular to a functional slow-release fertilizer and a production method thereof. Background technique [0002] Fertilizer is one of the most important means of production in agricultural production and an important guarantee for the development of agricultural production and national food security. At present, the fertilizer effect on most crops in my country is still the highest with nitrogen fertilizer. According to the data of the Food and Agriculture Organization of the United Nations, the contribution rate of fertilizers to the improvement of my country's grain production capacity is 45-50%, and the application rate ranks first in the world, but the utilization rate of chemical fertilizers is declining year by year. , about 30-35%, which is far lower than the utilization rate of chemical fertilizers in developed countries. Most of the chemical fertilizers enter the water body and t...

AI Technical Summary

Problems solved by technology

[0004] At present, slow-release nitrogen fertilizers are generally divided into two categories: one is synthetic organic long-acting nitrogen fertilizers, mainly including urea-formaldehyde condensates, urea-acetaldehyde condensates and a few phthaloamide compounds; the other is coated nitrogen fertilizers, which are coated on the surface of particles. Fertilizers made of one or more layers of semipermeable or insoluble other thin-layer substances. Commonly used coating materials include sulfur, resin, polyethylene, paraffin, asphalt, grease, phosphate rock powder, calcium magnesium phosphate fertilizer etc., but the production process of these products is complicated and the production cost is high, so they have not been popularized and applied in a large area

Moreover, the existing coated slow-release fertilizers generally have the defects of short nitrogen release time, insufficient fertilizer slow-release effect and relatively low biodegradation rate of the coated slow-release agent.