To explore the cultivation measures for improving the yield and quality of hybrid rice,we carried out early and late rice cultivation to study the effects of S-ABA on the yields and quality of'Yongyou 4949','Weiliangyou 8612',and'Qiaoliangyou 17'.The results showed that S-ABA increased the SPAD value and photosynthetic parameters during the heading stage,and dry matter accumulation during the heading and maturity stages of different rice cultivars.By comprehensively improving yield components such as effective panicle number,grains per panicle,seed setting rate,and thousand grain weight,S-ABA increased the rice yield by 7.8% to 11.1%,especially for the rice cultivar'Qiaoliangyou 17'.In addition,S-ABA increased the brown rice rate and head rice rate in processing quality as well as the alkali digestion value and gel consistency in the cooking quality.At the same time,it reduced the chalkiness degree and chalky grain percentage in the appearance quality and the amylose content in the cooking quality.The head rice rate,chalkiness degree,chalky grain percentage,and alkali digestion value of early rice cultivars treated with S-ABA showed significant differences compared with those of the control.S-ABA demonstrated stronger improvement effect on the quality of early rice than on that of late rice.Comprehensively,the results indicate that the application of S-ABA is a cultivation measure that can improve both the yield and quality of hybrid rice.
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