Effect of Nitrogen Application Rate on Nitrogen Efficiency and Grain Yield of High-Quality Indica Rice Variety Gyou325
[Objective]To determine the optimal nitrogen application rate for the hybrid indica rice vari-ety Gyou325.[Method]We established five nitrogen treatments(0,60,120,180,and 240 kg/hm²,labeled as N0,N60,N120,N180,and N240,respectively)to examine the impact of varying nitrogen rates on tiller number,biomass accumulation and transport,nitrogen uptake and utilization efficiency,and grain yield and its components in Gyou325.[Result]The findings indicate that the grain yield of Gyou325 significantly increased with the rise in nitrogen application rates,peaking in the N180 treat-ment.As the nitrogen application rate increased,the effective panicle number,grains per panicle,and total biomass at maturity initially increased and then declined,with the N180 treatment yielding the high-est values for effective panicle number and total biomass.The maximum grains per panicle were observed in the N120 treatment.Biomass distribution to the grain before and after heading showed a pattern of N180>N240>N120>N60>N0.The total nitrogen accumulation during the main growth phase of Gyou325 also exhibited an initial increase followed by a decrease.Efficiency metrics such as nitrogen biomass pro-duction efficiency,nitrogen rice production efficiency,nitrogen harvest index,nitrogen absorption and utilization rate,nitrogen agronomic utilization rate,nitrogen partial factor productivity,and nitrogen physiological utilization efficiency followed the order N0>N60>N120>N180>N240.[Conclusion]The high-quality hybrid indica rice Gyou325 can achieve both high yield and high nitrogen use efficiency with a nitrogen application rate of 180 kg/hm².
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