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以中粳稻武育粳 3号和杂交中籼稻汕优 6 3为材料 ,采用不同密度、施肥等栽培措施 ,形成成穗率不同的群体 ,研究水稻抽穗期源质量与产量关系及其影响因素。结果表明 :水稻高产群体抽穗期叶面积指数 (L AI)适宜 ,有效叶面积率高 ,高效叶面积率为 75 %～ 80 % ,灌浆期光合势在 2 .1 0× 1 0 6m2·d以上 ,势粒比在 47cm2·d/粒以上。势粒比 (光合势与总颖花量的比值 )能反映抽穗后群体源库发展动态的优劣 ,是经济产量形成期源库质量的较好表述。本试验条件下 ,通过穗肥等措施 ,在抽穗期适宜叶面积基础上 ,降低抽穗后叶面积下降速率 ,提高光合势和势粒比是进一步提高产量的有效途径
Taking the medium japonica rice Wuyujing 3 and the medium indica hybrid rice Shanyou 6 3 as materials, the population with different spike rate was formed by different density and fertilization techniques. The relationship between the source and yield of heading date and its influencing factors were studied. The results showed that the leaf yield index (L AI) of high-yielding rice group was suitable at heading stage, the effective leaf area ratio was high, the effective leaf area ratio was 75% -80%, photosynthetic potential at grain filling stage was above 2.01 × 106m2 · d , The particle ratio of 47cm2 · d / grain or more. The ratio of potential-to-grain ratio (ratio of photosynthetic potential to total spikelets) can reflect the pros and cons of the development of source stocks in the population after heading, which is a better representation of the quality of the source stocks during the economic yield formation. Under the conditions of this experiment, reducing the rate of decline of leaf area after heading and improving the photosynthetic potential and ratio of seedling to grain are the effective ways to further increase the yield,