Abstract:

To explore the reduction space of chemical fertilizer under side-deep fertilization, single-cropping rice was taken as the material to study the effects of fertilization methods on rice yield and nitrogen use efficiency under side-deep fertilization and conventional-shallow fertilization. Results showed that rice yield, effective panicle and nitrogen use efficiency of side-deep fertilization were significantly higher than those of conventional-shallow fertilization under the same nitrogen level. For example, rice yield, effective panicle and nitrogen use efficiency of side-deep fertilization were 11.46%, 10.18% and 34.77% higher than those of conventional-shallow application, respectively. Rice yield, effective panicle and nitrogen use efficiency of side-deep fertilization with reducing amount were 14.63%, 14.79% and 39.73% higher than those of conventional-shallow application with reducing amount. Under the condition of conventional-shallow application, the amount of nitrogen fertilizer reduction of 20% caused a significant reduction of rice yield. However, rice yield was not affected by the 20% reduction of nitrogen fertilizer application under side-deep fertilization. In all, side-deep fertilization is an effective measure to improve rice yield and nitrogen use efficiency, and the application of side-deep fertilization can reduce the amount of chemical fertilizer on the basis of stable yield.

Key words: side-deep fertilization, conventional-shallow fertilization, yield, nitrogen use efficiency, nitrogen fertilizer, chemical fertilizer reduction