Environment-friendly slow-release sulfur-based nitrogen potassium compound fertilizer

Abstract

The present invention relates to a mixed fertilizer which contains substances influencing nitrification of ammonium compounds or urea in soil. Provided is an environment-friendly slow-release sulfur-based nitrogen potassium compound fertilizer. The present invention is characterized by first preparing sulfur-based nitrogen potassium compound fertilizer granules, and then conducting primary coating of stearic acid and secondary surface powder spreading of modified zeolite powder on the sulfur-based nitrogen potassium compound fertilizer granules, to obtain the slow-release sulfur-based nitrogen potassium compound fertilizer, wherein the sulfur-based nitrogen potassium compound fertilizer granules are prepared from the following raw materials in parts by weight: 31 to 57 parts of urea, 10 to 20 parts of ammonium sulfate, 20 to 50 parts of potassium sulfate, 6 to 12 parts of a granulating auxiliary agent, and a proper amount of water. The present invention provides an environment-friendly slow-release sulfur-based nitrogen potassium compound fertilizer, which has good slow-release effect, high fertilizer effectiveness and utilization, simple process, and low production cost, is beneficial to protection of the soil, atmosphere, and water environment due to the fact that the coating material is easy to be degraded by microorganisms in soil, and is widely applied. The slow-release sulfur-based nitrogen potassium compound fertilizer is applicable to grain crops, vegetables, and fruit trees and used as a seed fertilizer, a base fertilizer, and a topdressing fertilizer. The compound fertilizer can also be mixed for use with all kinds of compound phosphate fertilizers available in the market.

Description

technical field [0001] The invention is an environment-friendly sulfur-based nitrogen-potassium composite slow-release fertilizer. Composts that contain substances that affect the digestion of ammonium compounds or urea in the soil. Background technique [0002] Compound fertilizers with a chloride ion content of more than 3% are called chlorine-based compound fertilizers. Compared with sulfur-based fertilizers, chlorine-based fertilizers have lower manufacturing costs and sales prices are significantly lower than sulfur-based fertilizers. However, due to the negative impact of chlorine-based compound fertilizers on the growth of some chlorine-avoiding crops, chloride-containing fertilizers such as potassium chloride and ammonium chloride should not be applied to saline-alkali soil and chlorine-avoiding crops. Chloride ions in chlorinated fertilizers will remain and accumulate in the soil, leading to soil acidification, and application in saline-alkali soil will aggravate s...

AI Technical Summary

Problems solved by technology

However, during the use of urea, it is easy to lose through volatilization, leaching, decomposition and runoff, resulting in low fertilizer utilization rate. According to statistics, the seasonal utilization rate is only about 30%, which not only causes waste of chemical fertilizers, but also Pollution of air, water, soil and other environments on which human beings depend

The nutrient utilization rate of sulfur-based compound fertilizers in the prior art is only 25% to 35%, and the utilization rate of nitrogen fertilizer is less than 30%, and the loss is particularly serious

The disadvantage is that the investment cost of high-tower granulation equipment is high, paraffin is a non-renewable fossil resource, and it is not easy to degrade in the soil

Resin coatings are expensive and do not degrade easily in soil

[0008] Environment-friendly sulfur-based nitrogen-potassium compound slow-release fertilizers are rare in the prior art

Images