采用裂区设计方式，对5个极早熟玉米品种的籽粒含水率及脱水速率进行了研究，结果表明品种间生理成熟时的籽粒含水率存在显著差异，变化幅度为35.61%～42.17%；收获时的籽粒含水率品种间差异极显著，变化幅度为15.49%～28.50%。抽丝后35d至生理成熟前籽粒平均脱水速率品种间差异显著，变化范围为0.5296%/d～0.9007%/d；生理成熟后至收获期籽粒的平均脱水速率品种间差异显著，变化范围为0.4246%/d～0.5935%/d。出苗至抽丝的天数、株高、灌浆期绿叶数、单穗产量等性状与籽粒含水量存在显著的相关关系，穗长和穗粗等性状对脱水速率有显著影响。另外试验条件下相对湿度对生理成熟后部分品种的脱水速率影响显著。

Using a split-plot design, five maize hybrids were studied on the traits as kernel moisture and grain drying rate, etc. The resluts showed that there was significant difference among tested varieties’ kernel moisture at physiological ripening from 35.61% to 42.17%. The extremely significant difference existed among tested varieties’ kernel moisture at harvesting from 15.49% to 28.50%. The significant difference appeared among tested varieties’ average kernel dry-down rate varied from 0.5296%/d to 0.9007%/d from the 35th day after silking to physiological ripening. There was significant difference among tested varieties’ average kernel drying rate from 0.4246%/d to 0.5935%/d from physiological ripening to harvesting. For the tested hybrids, it has significant correlation between kernel moisture and some plant traits as days from plant emergence to silking, plant height, green leaves at milking stage and kernels weight per ear, etc. Tested hybrids’ kernel dry-down rate was significantly influenced by ear length and ear diameter. For particular tested hybrid, kernel drying rate after physiological ripening was significantly affected by humidity in field.