施氮量与栽插密度对超级晚稻“天优华占”产量的影响

Using split-plot design, the effects of the nitrogen application amount and planting density on the yield were studied with double-cropping super late rice Tianyouhuazhan. The results showed that the grain yield and its 4 components were influenced significantly (P＜0.01) by nitrogen application, and the grain yield, effective panicle and spikelets per panicle were influenced significantly (P＜0.05) by planting density. The interaction of nitrogen application amount and planting density had very significant influence on effective panicle (P＜0.01) and spikelets per panicle (P＜0.05). The grain yield, biomass, total N uptake, nitrogen requirement for 100kg grain production, max. No. of tillers, tiller panicle rate and effective panicle were increased, with increased nitrogen application at the range of 0 to 210kg/hm^2, but the effective panicle forming rate was decreased. The biomass, total N uptake, nitrogen requirement for 100kg grain production, the max. No. of tillers and effective panicles increased with the increase of planting density from 18×10^4 to 30×10^4 hill•hm^2, but the tiller panicle rate and effective panicle forming rate decreased. The tiller panicle rate, nitrogen requirement for 100kg grain production were significantly linearly related to the yield, while a parabolic relationship was found between biomass, total N uptake and yield. The experiment showed it was favorable for increasing the yield of Tianyouhuazhan under the combination of 210kg/hm^2 N and 24×10^4 hill/hm^2-30×10^4 hill/hm^2.