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研究了机插条件下不同的栽植密度、氮肥使用量和氮肥中基、蘖、穗肥不同的用量比例对两系杂交水稻两优1528群体动态、产量构成以及生育进程。结果表明,两优1528分别在机插密度为24.0万穴/hm2、氮肥用量247.5 kg/hm2以及基、蘖、穗肥比例为5∶3∶2时产量最高。栽植密度过大,无效分蘖增多,每穗总粒数减少,密度过小则群体总量较小,有效穗不足;氮肥用量达247.5 kg/hm2时虽然产量最高,但氮肥偏生产力(PPN)较低,而氮肥用量202.5 kg/hm2可获得较高的产量和氮肥偏生产力。
The population dynamics, yield components and fertility development of two-line hybrid rice Liangyou 1528 were studied under different planting density, nitrogen fertilizer usage and different proportion of nitrogenous fertilizer, tillering and panicle fertilizer. The results showed that Liangyou 1528 had the highest yield at the density of 240,000 holes / hm2, the nitrogen application rate of 247.5 kg / hm2 and the ratio of base to tiller and panicle fertilizer of 5: 3: 2 respectively. The density of planting was too high, the number of ineffective tillers was increased, the number of total grains per panicle was decreased, while the density was too small, the total population was small and the effective spike was not enough. Although the yield of nitrogen fertilizer was 247.5 kg / hm2, the partial yield of nitrogen fertilization (PPN) Low, while the amount of nitrogen fertilizer 202.5 kg / hm2 can get higher yield and nitrogen fertilizer partial productivity.