Coated controlled-release fertilizer specialized for summer corns and preparation method thereof

The invention discloses a coated controlled-release fertilizer specialized for summer corns and a preparation method thereof. The coated controlled-release fertilizer specialized for summer corns consists of a nitrogenous fertilizer, a phosphate fertilizer and a potash fertilizer, wherein the nitrogenous fertilizer consists of carbamide and coated controlled-release carbamide, and the release duration of the coated controlled-release carbamide is 30-90 days; the mass ratio of nitrogen elements in the coated controlled-release carbamide to nitrogen elements in the carbamide is 20-40:80-60; themass ratio of the nitrogenous fertilizer to the phosphate fertilizer to the potash fertilizer is 15-20:5-9:8-12. Compared with the customary fertilization, the utilization ratio of the nitrogenous fertilizer is raised to the maximum, the dependence of soil on nitrogen is lowered to the minimum, and the net income is increased by 1715.25 Yuan/hm by using the special fertilizer. Besides, the release characteristics of the coated controlled-release nitrogen elements with a release duration of 60 days in field are better matched with the release characteristics of the nitrogen element in stillwater at 25 DEG C.