SLOW-RELEASE COMPOUND FERTILIZER APPLICABLE TO PLANTATION OF SOYBEANS

摘要

The present invention relates to a mixture of a plurality of fertilizers containing substances which exert influence on nitrification of urea in soil and components with no special fertilizer effectiveness. Provided is a slow-release compound fertilizer applicable to plantation of soybeans. The compound fertilizer is prepared from the following raw materials in parts by mass: 20 to 40 parts of urea, 7 to 20 parts of ammonium sulfate, 10 to 35 parts of potassium sulfate, 25 to 30 parts of a mixed phosphate fertilizer, 0.1 to 0.5 part of a zinc, iron, and molybdenum additive, 7 to 10 parts of a granulating agent, and a proper amount of water. A preparation method comprises the following steps: (1) preparation of a compound of a potash fertilizer and a nitrogen fertilizer; (2) preparation of the mixed phosphate fertilizer; (3) preparation of mixed particles of the components of the compound fertilizer; (4) coating with stearic acid; (5) powder spreading of a modified zeolite powder material; and (6) screening. The present invention provides a slow-release compound fertilizer applicable to plantation of soybeans, which has overall nutrients and excellent slow-release performance, can fully satisfy demands for nutrients by soybeans, achieves high fertilizer utilization, improves both yield and quality of soybeans, saves resources, and protects the environment.