贵州小麦不同生产水平群体结构的穗数、粒数、粒重的相关分析

CORRELATION ANALYSIS ON SPIKE NUMBER, DERNEL NUMBER AND KERNEL WEIGHT OF WHEAT UNDER DIFFERENT YIELD LEVEL OPULATION STRUCTURE IN GUIZHOU

选用兴麦１号、兴２６３、贵辐１２、兴麦９号４个品种１９８３年至１９８８年全省产量比较试验及１９９０年底调查结果为材料，应用相关、回归统计方法，讨论不同生产水平下亩穗数、穗粒数、千粒重三因素间的相互关系及在产量构成中的作用。结果表明：三因素变异系数之和与产量变异系数的比值随产量水平的提高而增大，４个品种依次由３．４７、２．７３、２．９８、２．１７增加到４．６８、２．８３、３．０４、２．７０；亩穗数变异系数变化规律与此相反，４个品种依次由２５．９２、２０．４６、１６．３９、２０．９５减少到１２．７９、１０．８１、７．７３、１５．１８，是三因素相互关系的主要成份；亩穗数偏回归平方和随产量水平的提高而降低，４个品种依次由０．６２１０、０．７１２３、０．８４１５、０．７８１８下降到０．５６３０、０．６４４０、０．５３３１、０，６９４２，说明ＳＮＭ在低产水平对产量影响较大，在高产条件下表现为产量的限制因素。

The data of the provincial wheat yield test(1983-1988)and the yield investigation(1990)of 4 wheat varieties,Xingmai 1 ,Xing 263, Guifu 12 and Xingmai 9 were used to determine correlation of spike number per mu (SNM).kernel number per spike(KNS) and l000-kernel weight(HKW) and their effects on yield components under different production levelCorrelation and regression analysis were applied i his study。The results skowed the ratio of the total coefficient of variation (C,V。for those three cornponents to the yield C。Lincreased with the yield level growing up。The C,V。 for SNM appeared opposite trends to this, SNM was the main component in the relationship of SNM, KNS and BKW。The sum of partial regression spuare got lower with yield increasing,Those indicated that SNM had more effective on the yield under the low yielding situation and appeared to be the limiting factor to the yield in the higher yielding level。