The grain breaking rate is an important index influencing the quality of corn mechanized threshing. To make clear the effect of grain moisture on the grain breaking rate,taking eight corn varieties as materials,using mechanized threshing,the grain moisture and grain breaking rate at different period were tested,the correlation analysis and regression analysis between the two indexes were conducted,and the section of grain moisture with the grain breaking≤5% was forecasted using the regression equation. The results showed that the correlation was very significantly positive between grain moisture and grain breaking rate（r=0.871）. The regression equation was y=0.128 x2-5.551 x＋63.564（R2=0.879）. When the grain moisture was 18.1%-25.2%,the grain breaking rate of most tested varieties could be less than or equal to 5%. Zhengdan 958 and Lianchuang 808 were not suitable for mechanized threshing,and Dika 517 could be earliest mechanized threshed among the tested varieties.
Journal of Hebei Agricultural Sciences
Grain breaking rate