小麦不同种植密度粒重分布特性的研究

对３种种植密度条件下小麦粒重分布特性的研究结果表明：小穗粒重、小穗结实粒数、各粒位粒重和结实数均以中下部小穗为最大，随植株密度的增大，穗粒重和穗粒数呈逐渐减小的趋势，小穗粒重、小穗结实粒数、各粒位的粒重和结实数也呈下降的趋势；不同粒位间的粒重，在结实数大于０．９５的情况下，表现为第２＞１＞３＞４粒位，在其它情况下则表现为第１＞２＞３＞４粒位

INVESTIGATION ONTHE GRAIN WEIGHT DISTRIBUTIONCHARACTERISTIC OF WHEAT IN DIFFERENT DENSITIES

The investigation on the grain weight distribution and grain bearing characteristic of wheat in different densities were carried out by using Yumai No.18 in 1993-1994.The results showed as follow:The distribution of weight spikelet,grain number spikelet,grain weights and numbers of grain bearing in grain positions were alike to spindle,spikelet 5-7 being maximum.The sequence on grain weight spike,the grain number spike,the grain weight spikelet,the grain number spikelet,the grain weight and grain bearing number in different positions appeared all the tendency of the dropping with density increasing.In the case of the grain bearing number >0.95,the grain positions showed as 2nd>1st>3rd>4th grain in the grain weitht,otherwise as 1st>2nd>3rd>4th grain.