Four components contribute to rice grain yield including the panicles per unit area, the number of spikelets, the percentage of, and the weight of ripe grains.
四个水稻籽粒产量构成因素为单位面积穗数、小穗数、成熟籽粒百分数和成熟籽粒重量。
The results indicated that the grain per spike, seed setting rate, spikes per unit area and thousand grain weight had great contribution to the yield, especially grain per spike and seed setting rate.
结果表明：每穗粒数、结实率、单位面积穗数与千粒重对优质稻产量形成贡献较大，尤其是每穗粒数、结实率；
Under limited thermo-unit conditions, keeping optimum ear Numbers per hectare, increasing ear grain Numbers per ear and remaining grain weight were important for high yield.
在有限光热资源条件下，保证穗数、主攻穗粒数、稳定千粒重是实现夏玉米高产的主要途径。
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