Effects of water management and nitrogen application strategies on yield and nitrogen absorption of super early rice "liangyou 287"

In order to provide a reasonable water and nitrogen management for double-cropping early rice production,using intermittent irrigation and conventional flooding irrigation as water management model and combining with different nitrogen application levels and application methods as nitrogen operation mode,an experiment was studied on the differences of yield and nitrogen absorption and utilization of super early rice Liangyou 287 in 2011.The results showed that the grain yield,biomass and total nitrogen accumulation of comtination that nitrogen fertilizer application amount of 180 kg/hm2 and postponing nitrogen application of 50% as basal fertilizer,30% as tillering fertilizer,20% as ear fertilizer and nitrogen fertilizer application amount of 225 kg/hm2 and postponing nitrogen application of 50% as basal fertilizer,50% as tillering fertilizer,0% as ear fertilizer under the intermittent irrigation method was higher than other and that of comtination that nitrogen fertilizer application amount of 225 kg/hm2 and postponing nitrogen application of 50% as basal fertilizer,50% as tillering fertilizer,0% as ear fertilizer and nitrogen fertilizer application amount of 225 kg/hm2 and postponing nitrogen application of 50% as basal fertilizer,30% as tillering fertilizer,20% as ear fertilizer under the flooding irrigation method was higher than other,and the apparent nitrogen utilization rate of the combination that intermittent irrigation,nitrogen fertilizer application amount of 180 kg/hm2 and postponing nitrogen application of 50% as basal fertilizer,50% as tillering fertilizer,0% as ear fertilizer was the highest of all.Under the intermittent irrigation methods,the treatments reached the appropriate effective panicle number,increased the panicle spikelets,and raised the seeding setting rate and 1 000 grain weight and the promotion of that at late stages.Also it improved the leaf nitrogen transport quantity and proportion,nitrogen transfer contribution rate and apparent nitrogen utilization rate,and reduced nitrogen requirement for 100 kg grain.The treatment that comtining intermittent irrigation with nitrogen fertilizer application amount of 180 kg/hm2 and postponing nitrogen application of 50% as basal fertilizer,30% as tillering fertilizer,20% as ear fertilizer was suitable for the actual production.