行株距配比对水稻群体特征的影响

摘要

试验表明，相同密度不同行株距比例(RS/IS)显著影响水稻群体发展。群体产量、穗数/667 m2、总颖花量、结实率、千粒重均随RS/IS呈抛物线变化，每穗颖花数、穗颈节间长及剑叶、倒二叶单叶面积则随RS/IS呈线性变化，RS/IS增大，群体内部光照强度增加，光分布趋于合理。%This experiment showed that characters of rice population were influenced by the ra tio of row spacing to intrarow spacing(RS/IS)under the same planting density. The relationship between yield and RS/IS assumed a parabolic change, so did the relationship between panicles/ 667 m2, total spikelets per 667 m2, setting percentage, or 1 000-grain weight and RS/IS. The equation between spikelets/panicles and RS/IS was a linear one, so was the equation between rachis internode length, single leaf area(SLA)of the first leaf from the top, or SLA of the second leaf from the top and RS/IS. When RS/IS was on the increase, the intensity of illumination was increased and the light distribution tended to be efficient inside rice population.