Controlled release fertilizer and method of preparing the same

Abstract

The invention relates to a fertilizer, in particular to a controlled release fertilizer and a preparation method thereof. The controlled release fertilizer enwraps inorganic coating materials outside fertilizer particles by adhesives, and the inorganic coating materials are aluminate cements or sulpho-aluminate cements, which account for 5% to 30% of the total weight of the controlled release fertilizer. The controlled release fertilizer can lead the fertilizer to slowly release in the soil and can meet the need of each growth period of crops by single application. The controlled release fertilizer can eliminate the leaching loss, volatilization and chemical fixation of nutrients in the soil and improve the utilization rate of the fertilizer. The preparation method of the controlled release fertilizer uses simple devices, is easy to be implemented and effectively reduces the production cost.

Description

technical field

[0001] The invention relates to a class of fertilizers, in particular to a class of controlled-release fertilizers and a preparation method thereof. Background technique

[0002] The agricultural practices of various countries in the world have shown that in order to obtain stable high yields, crops should receive sufficient nutrients, especially nitrogen, throughout the growth period. However, if a large amount of soluble mineral nutrient fertilizer is applied at one time, the crops will not have time to absorb it, which will cause nutrient loss and reduce the utilization rate of fertilizer. According to relevant data, the seasonal utilization rate of nitrogen fertilizer in China is more than ten percentage points lower than that of advanced countries. Part of the lost fertilizer seeps into the ground and rivers to pollute water sources, and the other part can generate nitric oxide and escape into the atmosphere, destroying the ozone layer. Chloride and su...