Multifunctional phosphorus fertilizer grains produced by mixing dicalcium phosphate and sodium bentonite and production technology thereof

Abstract

The invention discloses multifunctional phosphorus fertilizer grains produced by mixing dicalcium phosphate and sodium bentonite and a production technology thereof. The phosphorus fertilizer grains are prepared from the following raw materials: the dicalcium phosphate, the sodium bentonite and sulfur. The multifunctional phosphorus fertilizer grains disclosed by the invention have the beneficialeffects that the bentonite in the phosphorus fertilizer grains has a very high expansion coefficient and the problems that the dicalcium phosphate is difficultly dissolved into water and cannot be applied to the phosphorus fertilizer very well are solved. The phosphorus fertilizer grains are applied to a farmland and phosphorus element and sulfur element needed by crops are slowly released after the phosphorus fertilizer grains meet water, so that waste phenomena including volatilization, loss and the like of the phosphorus element are reduced; the utilization rate of the phosphorus fertilizeris increased and the validity period of the phosphorus fertilizer is prolonged. According to the phosphorus fertilizer grains disclosed by the invention, the sulfur element is mixed with the bentonite, so that after the phosphorus fertilizer grains are applied to the farmland, sulfur powder is uniformly dispersed into the farmland, and the sulfur is promoted to be more rapidly transformed into sulfate radicals on the surface of soil and the leaching loss of sulfate ions is reduced; the requirements on the sulfate ions can be met in a whole growth period of crops.

Description

technical field [0001] The invention relates to the field of agricultural production fertilizers, in particular to a multifunctional phosphate fertilizer granule made of calcium hydrogen phosphate mixed with sodium bentonite and a production process thereof. Background technique [0002] Fertilization has become one of the indispensable technical measures for agricultural production, contributing more than half of crop production. However, the utilization rate of fertilizers in China has always been relatively low. For example, the average utilization rate of nitrogen fertilizer for current season crops is only about 30%, which is lower than that of developed countries. It is nearly 20 percentage points lower. On the one hand, this is due to the unscientific fertilization method, and on the other hand, it is due to the characteristics of the fertilizer itself. Therefore, improving the utilization rate of fertilizers and developing and applying new multifunctional fertilizers ...

AI Technical Summary

Problems solved by technology

At present, the main types of phosphate fertilizers in my country are ordinary calcium superphosphate, which accounts for 55% of the phosphate fertilizer output, followed by calcium magnesium phosphate fertilizer, which accounts for 10% of the phosphate fertilizer output, and the others are in the form of compound or mixed phosphate fertilizers. After that, it is easy to be fixed by the soil in large quantities, the content of effective phosphorus fertilizer is low, and the utilization rate of phosphorus in the current season is very low, resulting in a large accumulation of phosphorus fertilizer in the soil and a waste of limited resources.