| Abstract: | With the super japonica rice Shennong 265 as the tested material,the effects of different nitrogen application amounts and basic tiller fertilizer (BTF)-ear granule fertilizer (EGF) ratios on the yield and nitrogen utilization characteristics of Shennong 265 were investigated.The results showed that when the BTF-EGF ratio was 8∶2 or 7∶3,the yield of Shennong 265 increased with the increased nitrogen application amount;when the BTF-EGF ratio was 6∶4,medium nitrogen level was more conducive to improving the yield of Shennong 265;under the condition of same BTF-EGF ratio,with the increased nitrogen application amount,the total nitrogen uptake increased,and the nitrogen physiological efficiency and harvest index decreased.At low and medium nitrogen levels,the higher the proportion of EGF was,the higher the yield,total nitrogen uptake and nitrogen recovery ratio were;at high nitrogen level,the BTF-EGF ratio of 7∶3 was more favorable;at the same nitrogen level,the higher the proportion of EGF was,the lower the nitrogen physiological efficiency and harvest index were.Under conditions of nitrogen application level of 255 kg/hm2 and BTF-EGF ratio of 7∶3,the dry matter accumulation in the leaves,stems and spikes of Shennong 265 was higher in the late growth period.Higher effective panicle number and grain number per panicle led to higher yield (9 581.5 kg/hm2,2.4％-20.1％ higher than those in the other treatment groups) and higher nitrogen use efficiency. |
