| Xiangzaoxian31 (less chalkiness degree) and baliangyou96 (more chalkiness degree) were studied by way of spraying no plant growth regulator (control), chalkiness improver (treatment one), PP333 (paclobutrazol, treatment two) at full heading stage; and PP333 (treatment three),6-BA (6-Benzylaminopurine, treatment four) at seven days after full heading stage . The main results were as follows:(1) It could reduce the chalkiness degree of Xiangzaoxian31 and baliangyou96 to spray plant growth regulators during milking ripening period , especially to spray PP333 and 6-BA at seven days after full heading stage. Plant growth regulators had certain effects on improving chalkiness characters in early indica rice.(2) Effects of spraying plant growth regulators during milking ripening period on milling qualities of early indica rice were different. However, spraying PP333 and 6-BA at seven days after full heading stage could increase grain head rice percentage and the specific gravity of grain in Xiangzaoxian31 and baliangyou96.(3 ) Effects of spraying plant growth regulators during milking ripening period on yield of early rice was very small. But it increased significantly yield of baliangyou96 to spray chalkiness improver at fullheading stage.(4) It could increase SOD activities in spike neck and grain of xiangzaoxian31 and baliangyou96 to spray plant growth regulators during milking ripening period. Grain SOD activities of xiangzaoxian31 were higher than that of baliangyou96.(5) It could increase the amount of grain endosperm starch cells of xiangzaoxian31 and baliangyou96 to spray plant growth regulators during milking ripening period. It significantly increased the amount of grain endosperm starch cells to spray PP333 and 6-BA at seven days after full heading stage.In addition, the improvement rule of plant growth regulators on the chalkiness of early rice and the mechanisms of their improvement on the chalkiness of early rice were discussed in this study.
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