以我国20世纪60年代以来20份玉米单交种和32份自交系为材料,研究玉米单交种和自交系子粒脱水速率的差异。结果表明:20份单交种生理成熟期子粒含水量变化范围在25%～35%,收获期大部分单交种的子粒含水量集中在25%左右;32份自交系生理成熟期子粒含水量变化范围在25%～38%,收获期大部分自交系的子粒含水量在20%～25%;生理成熟后各单交种和自交系的脱水速率有明显差异。 In this paper, 20 maize crosses and 32 inbred lines in China since the 1960s were used as materials to study the differences of dehydration rates of maize single and inbred lines. The results showed that the moisture content of 20 single cross hybrids at physiological maturity ranged from 25% to 35%, and that of most of the single cross hybrids at harvest was 25% The water content ranged from 25% to 38%. The moisture content of most of the inbred lines in the harvest period was between 20% and 25%. After the physiological maturation, there were significant differences in the dehydration rate among the single and inbred lines.