Study on N Application Technique for New Early Indica Rice Variety Zhe408

[Objective] The aim was to provide scientific basis for popularization and application of Zhe408.[Method] The N fertilizer application experiments with different pure nitrogen amount and different proportion of base fertilizer,tillering fertilizer,panicle fertilizer applied to Zhe408 were carried out on the red soil rice area in Jinhua and the demand of Zhe408 for N fertilizer was made clear.[Conclusion] The beginning tillering stage,heading stage and mature stage of Zhe408 were postponed,the growth period was prolonged,and effective panicles number in the unit area,grains per spike,1 000-grain weight and yield first increased and then decreased with the increase of N fertilizer rate.Under the condition of applying the same total amount of nitrogen during whole rice growth stage,the beginning tillering stage of Zhe408 applied with more N fertilizer in the early stage was early and its effective tillering stage was short.The largest seedling number in the unit area,effective panicles number and the yield was highest when the application proportion of base fertilizer,tillering fertilizer,panicle fertilizer was 6∶3∶1,and grains per spike,seed setting rate and 1 000-grain weight was higher when their application proportion was 4∶4∶2 or 5∶3∶2.[Result] The higher yield was obtained when the total pure nitrogen amount during whole rice growth stage was 172.5-217.5 kg/hm2 and application proportion of base fertilizer,tillering fertilizer,panicle fertilizer was 5∶3∶2 or 6∶3∶1.