以河北省低平原区不同类型的5个夏玉米品种为试材，在同一种植密度水平下，研究不同夏玉米品种灌浆、脱水和粒收特性之间的差异。结果表明，5个品种在授粉后40 d时达到了百粒鲜重最大值，之后开始缓慢下降，伟科702鲜重最大，华美1号最小。5个品种百粒重和鲜重表现趋势一致，在授粉后40 d内增长较快，衡玉1182百粒重最大，蠡玉35最小。5个品种灌浆速率呈单峰曲线，均在授粉后20 d左右达到最大峰值，灌浆峰值表现为衡玉1182 > 华美1号 > 伟科702 > 郑单958 > 蠡玉35。5个品种粒收时子粒含水率差异很大，衡玉1182最低，华美1号次之，蠡玉35最高。衡玉1182子粒破损率、杂质率和产量损失率均最小，子粒产量最高。综合分析，衡玉1182具有子粒灌浆速率快、收获时子粒含水率低、破损率和杂质率低、产量高等特质，可以作为直接粒收品种大面积推广。

In the 5 summer maize varieties of different types of low plain area in Hebei Province as test materials, in the same planting density, study on grain-filling, dehydration and grain grouting characteristics between the different summer maize varieties, and the influence of the related factors on yield characteristics were analyzed. The results showed that after 40 days of pollination, five maize varieties reached the maximum value of 100 seed fresh weight, and then declined slowly. The maximum fresh weight of 5 varieties was Weike702, and Huamei1 was the smallest. Five varieties of 100 seed dry weight and fresh weight showed the same trend, it was a rapid growth period at 40d after pollination, the 100-grain dry weight of Hengyu1182 was maximum, Liyu35 was minimum. The grain-filling rate of 5 varieties showed a single peak curve, reached the maximum peak at 20d after pollination, the peak performance of 5 maize varieties showed that Hengyu1182 > Huamei1 > Weike702 > Zhengdan958 > Liyu35. The percentage of grain water of 5 maize varieties was very different at mechanized grain harvest, Hengyu1182 was the lowest, Liyu35 was the highest. The grain broken rate, grain impure rate and yield loss rate of Hengyu1182 were the smallest, but the grain yield was the highest. The comprehensive analysis showed that Hengyu1182 was characterized by fast grain-filling rate, low percentage of grain water, low grain broken rate, low grain impure rate and high grain yield, it can be used as a mechanized grain harvest variety planted in Hebei Lowland Plain.

国家玉米产业技术体系项目（nycytx-02）、河北省科技支撑计划项目"高产广适夏玉米新品种选育"（16226323D-X）、河北省农林科学院青年基金项目"美国耐密型玉米种质资源引进与利用研究"（A2015040101）