Preparation method of sustained-release chlorine-based nitrogen-potassium compound fertilizer

摘要

The present invention relates to a mixed fertilizer which contains substances influencing nitrification of ammonium compounds or urea in soil. Provided is a method for preparing a slow-release long-acting chlorine-based nitrogen potassium compound fertilizer. The method is characterized by first preparing chlorine-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 chlorine-based nitrogen potassium compound fertilizer granules, to obtain the slow-release long-acting chlorine-based nitrogen potassium compound fertilizer, wherein the chlorine-based nitrogen potassium compound fertilizer granules are prepared from the following raw materials in parts by weight: 30 to 60 parts of urea, 10 to 20 parts of ammonium chloride, 22 to 53 parts of potassium chloride, 7 to 11 parts of a granulating auxiliary agent, and a proper amount of water. The present invention provides a method for preparing a slow-release long-acting chlorine-based nitrogen potassium compound fertilizer, which has good slow-release effect and high fertilizer effectiveness and utilization as the chlorine element in the compound fertilizer can play a full role in the growth of crops; has simple process and low production cost; and 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. The compound fertilizer has good slow-release effect and high fertilizer utilization, and is applicable to various crops.