对忻综5号玉米群体完成了二轮半姊妹轮回选择,其群体的变化是:单株产量和有关产量、植株性状都向有利于产量提高的方向取得进展;群体内优良基因型个体增加;变异系数有逐轮减小的趋势。通经分析表明,改良群体产量提高的原因,主要是由于克服了千粒重、穗行数与各性状间对产量不利的负相关,协调了各性状间的制约关系等。 The second round and half sister reincarnation of Xinhe 5 maize population was completed. The changes of herds were as follows: single plant yield, yield and plant traits all made progress in favor of yield increase; individuals with fine genotypes increased in group; The coefficient of variation has a trend of decreasing round by round. The analysis shows that the reason for the improvement of population yield is mainly due to overcoming the negative correlation between the 1000-grain weight, the number of ear rows and the traits, and the coordination between the traits.