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《Journal of Yunnan Normal University (Natural Sciences Edition)》 2004-03
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A Study on slow release complex fertilizer wrapt with diatomite

BI Xian-jun~1, JIANG Hua~2, YIN Zhao-jiang~1,LUO Yu-lin~1,QIOU Fang~1 (1.Institute of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650092,China; 2. Huaying Technology Ltd. CO. Yunnan,Kunming 650118,China)  
A slow release organic complex fertilizer wrapt with diatomite was studied. First, the proportion of N : P : K was calculated out equaling 7.0 : 7.0 : 7.0 after urea, organic fertilizer, humic acid, calcium dihydrogenphosphate ammoniate, potassium sulfate and diatomite used for raw materials. Second, the quantities of the raw materials were calculated out according to the phosphorus in the calcium dihydrogenphosphate ammoniate. Finally, the slow release fertilizer wrapt with diatomite was prepared by mixing the six raw materials, and the mixture was dried and shaped. The results show that the slow release fertilizer has good slow release effect, simple process for its production , reasonable proportion and low cost of product.
【CateGory Index】: S143.4
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