Effects of Nitrogen Application on Grain Yield and Nitrogen Utilization of No-tillage Machine Transplanted Rice

The effects of different nitrogen application on grain yield and nitrogen utilization of no-tillage machine transplanted rice Zhongzheyou 1 were studied. The results showed that it is a single peak curve relation between nitrogen rate and yield. The paniclenumber increased with nitrogen rate, but the effective panicle percentage decreased. The high yield could obtain through enhancing nitrogen input under low planting density condition. The leaf length and chlorophyll content increased when nitrogen input increased,nitrogen agronomic efficiency and the nitrogen partial productivity decreased with the nitrogen rate increased, the optimum planting density was 21 hills per m2, and the optimum nitrogen input was 180 kg/hm2.