叶喷S3307对紫花苜蓿越冬率和生产性能的影响OA

To investigate the effects of foliar application of S3307(uniconazole)on the winter survival rate and production performance of alfalfa(Medicago sativa),different concentrations of S3307 were sprayed on October 10th,2023.Agronomic traits,physiological indices,yield,nutritional value,and winter survival rate of alfalfa were determined.The results showed that root crown diameter,root length,fresh and dry root weight of alfalfa were greater in all treatment groups compared to the control,both before and after winter.Following overwintering,enzyme activities of peroxidase,superoxide dismutase,catalase and malondialdehyde content in alfalfa increased compared to pre-winter levels,while contents of soluble protein,water-soluble carbohydrates,and free proline decreased.Root activity in alfalfa was significantly higher across all treatments compared to control,both pre-and post-winter.All treatments significantly increased the winter survival rate of alfalfa.The winter survival rate showed a significant negative correlation with pre-winter peroxidase and superoxide dismutase activities,as well as malondi-aldehyde content,while it exhibited highly significant positive correlation with root crown diameter,root activity,and the contents of water-soluble carbohydrates,and free proline in root crown.All treatments significantly increased the mean plant height,stem diameter,branch number,stem leaf ratio,crude protein content,relative feed value,as well as total fresh forage and hay yields of three-cut alfalfa.All indicators under T3 treatment(160 mg/L S3307)were significantly greater than those in control.Comprehensive evaluation using membership function indicated that foliar application of 160 mg/L S3307 was the most effective in regulating alfalfa growth.