大穗小麦品种(系)产量及其构成因素分析

运用多元相关、逐步回归和通径分析法对一些大穗小麦的产量构成因素等农艺性状进行研究。结果表明：①单位面积冬季总茎数、穗数和群体平均单穗粒重与产量呈显著正相关，相关系数分别为０．５９２＊，０．４６４＊和０．７３０＊，３个性状均被选入最优方程；②各产量构成因素对产量的直接贡献是：单位面积穗数（Ｐｙ＝１．３５６）＞群体平均单穗粒重（Ｐｙ＝１．２１８）＞每穗粒数（Ｐｙ＝０．９０７）＞千粒重（Ｐｙ＝０．３９５）＞每穗小穗数（Ｐｙ＝－０．３７７）；③提出将群体平均单穗粒重作为衡量大穗小麦的综合量化指标，将“穗足、穗大、穗匀”作为大穗小麦产量结构选育目标

An Analysis of the Yield and Yield Components in Some Big Spike Wheat Varieties

The yield and components of some big spike wheat varieties are studied by means of multiple correlation,progressive regression and path analysis.The result shows that:1) winter tiller per acreage,spike number per acreage and seed weight per spike have a correlativeconnectionwiththeyield.Therespectivecoefficientsare 0.592 *, 0.464 * and 0.730 *,and all are selected into the best equation.2) The direct contributions of yield components to yield are as follwos:the spike number per acreage is the most ( Py =1.356),the seed weight per spike is more than the seed number per spike and the spikelet number per spike is the least ( Py =-0.377).3)It is suggested that the colony average seed weight per spike be taken as a comprehensive and quantitative standard for the big spike wheat.