密度对夏玉米灌浆特性及产量的影响

The Effects of Increasing Density on Summer Grouting Characteristics and Yield

研究了适宜种植密度(60 000株/hm2)和增加密度(60 000+15 000株/hm2)对夏播玉米洛玉8号、郑单958灌浆特性的影响,以借助密度调控灌浆,实现夏玉米高产和源库协调。结果表明:随着密度由60 000株/hm2增加到75 000株/hm2,郑单958籽粒干质量增加量减小,日增量也减小,最终产量增加3.20%;洛玉8号籽粒质量增加量灌浆前期减小,散粉后35d开始增加,增量峰值也减小,最终产量增加7.2%。同一密度条件下,两品种表现也有所不同,60 000株/hm2密度下洛玉8号籽粒质量增量大于郑单958,日增量峰值则较郑单958低5.42%,产量(9 877.8kg/hm2)比郑单958高3.0%。75 000株/hm2密度下洛玉8号籽粒干质量增量大于郑单958,日增量较郑单958高22.27%,产量(10 586.1kg/hm2)比郑单958高7.0%。随着密度增加,灌浆进程减缓,洛玉8号较郑单958受影响小,且最终产量均增加。

This paper studied the summer corn Luoyu 8 and Zhengdan 958 grouting characteristics by the sui-table density（60000plants/ha） and increasing density by 15000plants/ha,in order to realize the summer high yield and source-sink coordination through controlling density.The result indicated that along with the density from 60000 to 75000plants/ha,Luoyu 8 kernel dry matter increased bigger than Zhengdan 958,the day increasing peak value was bigger too,the final yield of Zhengdan 958 and Luoyu 8 increase 3.2% and 7.2%.At the density of 60000plants/ha,Luoyu 8 kernel dry matter increased more than Zhengdan 958,day increasing peak was lower than Zhengdan 958,and final yield was higher by 3.0% than Zhengdan 958.At the density of 75000plants/ha,Luoyu 8 kernel dry matter increased more than Zhengdan 958,day increasing peak was bigger than Zhengdan 958,and final yield was higher by 7.0% than Zhengdan 958.As density isincreased,the grouting gets down,Luoyu 8 is better than Zhengdan 958,and the yield is increasing.