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采用回归异质性测验法分析了黑龙江省８个玉米杂交种抽丝后３０～６０ｄ期间百粒重的变化。结果表明，此期间早熟和晚熟杂交种百粒重变化的回归系数差异显著，因而平均灌浆速率也有显著差异。
Regression heterogeneity test was used to analyze the changes of 100-kernel weight of 30 maize hybrids in Heilongjiang Province 30-60 days after spinning. The results showed that there was a significant difference in the regression coefficients of 100-kernel weight between the precocious and late-maturing hybrids during this period, and the average filling rate was also significantly different.