The chalkiness of Liangyoupeijiu was affected significantly by both seeding time and growing areas, the range of chalky grain rate and chalkiness degree were 54.0 and 13.0 percent point, respectively.

• 受播期和纬度的双重影响，两优培九稻米垩白率、垩白度的最大极差分别为54.；0和13