Abstract:

In the south double season rice area, We took super middle rice ‘Zhongzheyou 1’ as the experiment material, the effect of the rice growth, yield formation and characteristics of nitrogen uptake and utilization were studied under the different nano-meter urea application rate. The results showed that: Under the different nano-meter urea application rate, the characteristics of paddy rice growth, yield formation and the nitrogen uptake and utilization were different; suitable nitrogen application rate was obviously able to promote the tiller occurrence, ear-bearing rate and the glume flower differentiation, guaranteed high LAI and leaf SPAD value, forms the strong photosynthesis productivity, finally forms more biomasses, enhances the nitrogen uptake and utilization efficiency of the super rice, and finally got the higher gain yield. The 225 kg/hm2 nitrogen application rate got the highest yield. The 180 kg/hm2 nitrogen application rate got the highest nitrogen utilization. Consider the Factors above the yield and economic cost and nitrogen utilization, 180 kg/hm2 nitrogen application rate is the reasonable nitrogen application rate of ‘Zhongzheyou 1’ in the double-crop rice area.