小麦抽穗时间与穗粒重关系的研究

A Study on the Relationship between the Grain Weight per Ear in the Heading Period

在两种肥力条件下,研究了同一群体内抽穗时间对穗部性状和穗粒重的影响.结果表明,穗粒重及其积累动态均随抽穗时间推迟而明显下降;上部小穗粒数减少造成的整个穗粒数的减少,是导致穗粒重下降的主要原因.抽穗时间不同产生的差异在高肥地块上比在中肥地块上大.群体抽穗延续时间是抽穗前群体整齐度综合变化的结果.提高整齐度,缩短群体抽穗时间,对改善穗部性状、稳定提高粒重有明显作用.

Under the condition of two kinds of soil fertility, a study was made to observe the influence exerted by the heading period on the property of the wheat ear and the grain weight ear in the Same plant population The result indicated that both the ear weight and its accumulative dynamic apparently declined with the postponed' heading stage;the decreased grain number of upper small ears resulted in the reduction of ear grains as a whole, which was throught to be the main reason for the declination of weight of the grains per ear. The diversity caused by the different heading time was more apparent in the high-fertile plots than in The medium-fertile ones.The postponed heading period of a population was the result of comprehensive Changes of population balance before heading Raising the balance level and shortening the heading period would play an apparent role in improving the feature of a ear and increasing the grain weight.