【摘要】 以超试1号(晚熟型)、郑单958(中熟型)为材料,研究了5个种植密度对玉米产量、叶面积指数和子粒灌浆进程的影响。结果表明,在2.25万～11.25万株/hm~2范围内,增加种植密度可提高单位面积玉米产量,但增幅越来越小,最佳种植密度为6.75万～9万株/hm~2。随着密度的增加,叶面积指数提高;种植密度对玉米单粒重的影响主要是通过影响前期的灌浆速率,不同品种单粒重的差别是灌浆持续期和平均灌浆速率共同作用的结果。更多还原

【Abstract】 Two maize hybrids,"Chaoshi 1"(later maturing) and"Zhengdan 958"(medium maturing) were used to elucidate effects of planting density on yield,leaf area index and grain filling process.The results showed that the yield could be improved with the increase of planting density from 22500 to 112500 plants/ha.The best planting density was 67500 plants/ha to 90000 plants/ha.With the increase of planting density,the leaf area index(LAI) increased.The decline of single kernel weight was mainly caused by the decrease of slightly-increasing period of grain filling rate.The difference of single kernel weight among the hybrids was mainly caused by the grain filling duration and rate.更多还原