Effects of exogenous gibberellin(GA3)spraying on agronomic traits and forage yield of alfalfa

YUE Haiyan; SUN Qunce; ZHANG Shuzhen; YAN Baowei; ZHOU Yiming; AN Youping; WANG Yuxiang

doi:10.13557/j.cnki.issn1002-2813.2025.16.019

Abstract：The study aimed to investigate the effects of exogenous gibberellin(GA3)on the agronomic traits and forage yield in alfalfa with different fall dormancy levels.The experiment used two alfalfa varieties,Xinmu No.4 and Saiwo,which were sprayed with 0(CK),10,20,30 and 40 mg/L GA3,respectively.The results showed that compared with the CK treatment,under the 30 mg/L GA3 treatment,the dry hay yield of the first crop of Xinmu No.4 significantly increased(P＜0.05),the dry weight/fresh weight ratio and dry hay yield of the second crop significantly increased(P＜0.05),and the number of stem internodes,leaf-stem ratio,dry weight/fresh weight ratio ratio and dry hay yield of the third crop significantly increased(P＜0.05).Under the 30 mg/L GA:3 treatment,the plant height,leaf to stem ratio and dry hay yield of Saiwo in the first crop were significantly higher than those of the CK treatment(P＜0.05),the branch number,dry weight/fresh weight ratio and dry hay yield of the second crop were significantly higher than those of the CK treatment(P＜0.05),and the plant height,dry weight/fresh weight ratio and dry hay yield of the third crop were significantly higher than those of the CK treatment(P＜0.05).The annual dry hay yield of Xinmu No.4 and Saiwo under the 30 mg/L GA3 treatment was 51.19％and 41.63％higher than that of the CK treatment,respectively.The study indicates that exogenous application of GA3 can improve the field agronomic traits and hay yield of alfalfa,and the effect of spraying 30 mg/L GA3 is better.