Effects of organic fertilizer on rice yield development and nitrogen usage efficiency
Based on the same application of basal manure,the effects of the ratio of organic to inorganic fertilizer used as top-dressing on rice yield development were investigated.The results were as follows.When more organic fertilizer was used,the number of ears and glumes decreased,but the burliness grain percentage increased significantly.Under our experimental conditions,when the ratio of organic to inorganic fertilizer was 4∶6,dry matter production and accumulation after heading increased up to the highest biomass.Meanwhile,the grain number per ear,1000-kernel weight and yield were enhanced and nitrogen usage efficiency also reached its peak.