METHOD FOR PREPARING SPECIAL SLOW-RELEASE LONG-ACTING COMPOUND FERTILIZER FOR TOBACCO

摘要

The present invention provides a method for preparing a special slow-release long-acting compound fertilizer for tobacco. The compound fertilizer is a mixture of a plurality of fertilizers containing substances that affect nitrification of urea in soil and ingredients with no special fertilizer effect. The compound fertilizer is prepared with the following raw materials in parts by mass: 20-45 parts of urea, 10-20 parts of ammonium sulfate, 20-40 parts of potassium sulfate, 10-30 parts of a mixed phosphate fertilizer, 0.1-0.5 part of zinc, copper, boron, and molybdenum additives, 6-12 parts of a granulation additive, and a proper amount of water. The preparation method comprises the following steps: (1) preparing compounds of a potash fertilizer and a nitrogen fertilizer; (2) preparing a mixed phosphate fertilizer; (3) preparing mixed particles of each ingredient of the compound fertilizer; (4) coating with a stearic acid; (5) spreading powder of a modified zeolite powder material; and (6) screening. The method overcomes conventional prejudices, reduces the production cost, and is environment friendly. Therefore, the present invention provides a method for preparing a special slow-release long-acting compound fertilizer for tobacco, which is comprehensive in nutrition and excellent in slow-release performance, can fully satisfy demands for nutrients by tobacco, and has high fertilizer utilization, thereby improving both yield and quality of tobacco.