河南省夏玉米不同品种脱水速率研究

Studies on Kernel Dehydration Rate of Summer Maize Hybrids in Henan Province

分析了2007～2009年河南省审定的8个玉米杂交神生理成熟前后籽粒在田间自然奈件下脱水干燥的速率，结果以豫单2670最快，达1．09％／d，郑单2201最慢，为0．50％／d。但不同品种黑色层出现前后脱水速率有差异。黑色层出现前，洛玉8号最快，达2．56％／d；郑单988最小，为0．50％／d。黑色层出现后，郑单528最大，为0．68％／d；而新单26最小，只有0．20％／d。黑色层出现前品种间的脱水速率差异比黑色层出现后的大。

The natural kernel dehydration rate of 8 summer maize hybrids in Henan province in field before and ＇after physiological maturity stage was analyzed. Yudan 2670 showed the fastest dry rate （ 1.09%/d）, while Zhengdan 2201 had the lowest dehydration rate, being 0.50%/d. There were differences in natural kennel dehydration rate among the tested cultivars before and after the appearance of grain black layer. Luoyu 8 showed the fastest dry rate （2.56%/d）, but Zhengdan 988 did the lowest （0. 50%/d） before the appearance of grain black la） er. Zhengdan 528 showed the fastest dry rate （0.68%/d） , but Xindan 26 revealed the lowest （0.20%/ d） after the grain black layer appeared. The differences in natural kernel dehydration rate among the cultivars betbre the appearance of grain black layer were greater than those affter the appearance of grain black layer.