Effects of controlled release bulk blending fertilizer(CRBBF)on rice yield

The controlled release bulk blending fertilizer(CRBBF) was mixed with coated nitrogen and soluble nitrogen, phosphorus, potassium fertilizer in according to the principle of balance fertilization. The CRBBF Ⅰwas applied together with carbonic ammonium, and the CRBBF Ⅱwas spreaded with no other fertilizer in single time basal fertilization. Results showed that the CRBBF possessed balancing and slow releasing nutrients. It is adaptable to single time basal fertilization during whole rice growth. The content of N, K of rice plant increased obviously by applying CRBBF,the number of tillers, effective panicle and filled grain of rice improved a lot, and the grain setting rate rose markedly. Comparing with normal fertilization, the early rice yield increased by 9.02% to 14.57%, and late rice yield increased by 4.28% to 9.17% with application of CRBBF Ⅰ; the early rice yield increased by 7.45% to 12.14%, and late rice yield also improved with application of CRBBF Ⅱ. Fertilizer production efficiency increased by 53.29% to 79.47% and 17.41% to 25.07% respectively with application of CRBB I and CRBB II.