水稻抽穗后源质量与产量关系的研究

STUDY ON RELATIONSHIP BETWEEN SOURCE QUALITY AND GRAIN YIELD AFTER HEADING IN RICE

以中粳稻武育粳 3号和杂交中籼稻汕优 63为材料 ,采用不同密肥等栽培措施 ,形成成穗率不同的群体 ,研究水稻抽穗后源质量与产量关系 .水稻高产群体 ,抽穗期 LAI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× 1 0 6m2 .d-1以上 ,势粒比 (光合势与总颖花量的比值 )在 4 7cm2 .d-1.粒 -1以上 .势粒比能反映抽穗后群体源库发展动态优劣 ,是经济产量形成期源库质量的较好表述 .在抽穗期适宜叶面积基础上 ,降低抽穗后叶面积下降速率 ,提高势粒比是进一步提高产量的有效途径 .

Taking middle season Japonica rice Wuyujing 3 and middle season Indica rice hybrid Shanyou 63 as trial materials. Though different planting density and applying N\|fertilizer amount, populations of different percentage of panicle bearing tillers. We studied the relationship between source quality at heading stage and it′s influencing factors, the results were as following: For rice population with high grain yield, at heading stage, LAI was appropriate, ratio of effective leaf area was high, ratio of highly effective leaf area is 75%～78%. And during filling period, photosynthetic potential is higher than 2.1×10 6 m 2·d -1 , photosynthetic potential\|grain ratio was higher than 47 cm 2·d -1 spikelet. Photosynthetic potential\|grain ratio (ratio of photosynthetic potential after heading versus the total quantity of spikelets) reflected the developing relationship dynamically of source\|sink after heading, it′s a better indication for source and sink quality during period of economic yield formation. On the base of appropriate leaf area at heading stage, which would be effective measures for further higher grain yield that reducing the declining rate of leaf area, increasing photosynthetic potential\|grain ratio.