Controlled release compound fertilizer for corn seedling and preparation method thereof

Abstract

The invention discloses a controlled release compound fertilizer for corn seedling and a preparation method thereof. The seedling controlled release compound fertilizer comprises coated urea, phosphate fertilizer and potash fertilizer. Nutrient contents are that: 16-24% of N, 11-16% of P2O5, 8-12% of K2O, and preferred is 20% of N, 14% of P2O5 and 10% of K2O, wherein N:P2O5:K2O equals to 1.0:0.7:0.5. The coated urea contains a fertilizer core of common large granule urea, a coating material of polyethylene or polyurethane and 42% of nitrogen, and has an initial stage leaching rate larger than 0 and less than 2% and a release period of 50-70 d; the phosphate fertilizer is granular heavy calcium superphosphate with a P2O5 content of 40-44%; The potash fertilizer is granular potassium sulfate with a K2O content of 50-52%; and the coated urea, granular heavy calcium superphosphate and granular potassium sulfate all have a particle diameter of 3.0-4.0mm. The seedling controlled release compound fertilizer can promote early growth stage of corn, advance fertility process, raise output, reduce nitrogen amount used in early growth stage of corn and nitrogen discharge into environment, increase nitrogen utilization rate. Therefore, the seedling controlled release compound fertilizer has high economic, social and ecologic benefits.

Description

technical field [0001] The invention relates to a controlled-release compound fertilizer and a preparation method thereof, in particular to a seedling-growing controlled-release compound fertilizer suitable for a corn seedling cultivation and transplanting production system and a preparation method thereof. Background technique [0002] Compared with direct seeding, corn seedling transplanting is widely used in corn production in Southwest my country and the cultivation of special corn in many areas due to its advantages of early growth process, drought resistance, lodging resistance and close planting of whole seedlings. In the transplanted corn production system, the excessive application of nitrogen fertilizer existed at the seedling stage and the field growth stage at the same time, and there were large differences among farmers. In 2008, the survey results of the main production areas of transplanted corn such as Sichuan and Chongqing showed that the average input of ni...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent 00102158.3 (2000) patent discloses a kind of full-nutrition fertilizer for seedling and seedling raising that can be widely used in various crops. It is compounded in proportion by chicken manure, ammonium sulfate, diammonium and mixed strains. Its available nitrogen sources are respectively It is provided by 5-10% ammonium sulfate and diammonium, and chicken manure can also provide part of nitrogen. Under the safe amount of inorganic nitrogen, this fertilizer is not enough to carry more nitrogen to realize the early stage of growth when seedlings are transplanted. The regulation of nitrogen in the rhizosphere cannot effectively reduce the amount of nitrogen application in the early stage of crop growth, reduce the loss of nitrogen in the early stage of growth, and improve nutrient use efficiency

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