近年来,潍坊市各县区麦田套种的夏玉米推广了增行加株,提高密度的措施,由于畦埂和畦面上的套种行播种期不一致,以及播种时期欠墒,覆土不匀和种子纯度较低等原因,造成群体性状参差不齐,严重影响产量。刘百韬的研究工作证明,玉米果穗长度整齐度与产量有极显著的相关关系。顾慰连等c 2]用变异系数做为衡量整齐度的指标指出,在每亩3,333～3,500株的条件下,田间整齐度对穗粒数的影响具有极显著 In recent years, Weifang County wheat field intercropping summer maize to promote the addition of additional strains, to increase the density of the measures, as a result of intercropping sowing and noodles on the sowing of inconsistent sowing time and sowing moisture, uneven soil and seeds Low purity and other reasons, resulting in uneven group traits, seriously affecting the yield. Liu Baitao’s research shows that there is a very significant correlation between maize ear length uniformity and yield. Gu Weilian and other c 2] with the coefficient of variation as a measure of uniformity of the indicators pointed out that 3,333 to 3,500 per acre in the field conditions, the uniformity of the field grain number per spike is extremely significant