Effects of four brassinolide formulation products on persistence periods and agronomic traits of Chinese cabbage at different growth stages

XIE Ziwei; SHI Chunlan; YANG Dewei; WANG Shiqing; JIANG Zhiguo; WU Guoxing

doi:10.16861/j.cnki.zggc.2025.0594

Abstract：A study was conducted to investigate the persistence periods of four brassinolide pesticide products at different growth stages of Chinese cabbage,as well as their effects on the agronomic and quality traits of the crop.Taking Chinese cabbage cultivar 83-1 as the test material,foliar spraying of the four products was carried out at the seedling stage and rosette stage of Chinese cabbage,respectively,with the control(CK)sprayed with an equal volume of clear water.The increment of living matter at the two growth stages was used as the indicator to evaluate the persistence periods of the four pesticides.In addition,the agronomic and quality traits of Chinese cabbage were determined 30 days after spraying.The results showed that there were differences in the persistence periods of the four agents.At the seedling stage of Chinese cabbage,the persistence periods of 0.004%propionyl brassinolide soluble concentrate,0.004%28-epihomo-brassinolide aqueous solution,0.001 6%28-epihomobrassinolide aqueous solution and 0.01%24-epibrassinolide soluble concentrate were 15,11,10 and 9 days,respectively;while at the rosette stage,their persistence periods were 14,10,6 and 5 days,respectively.In addition,30 days after application,all four brassinolide agents could improve the agronomic traits of Chinese cabbage.Among them,the yield-increasing effect of 0.004%propionyl brassinolide soluble concentrate was superior to that of 0.004%28-epihomobrassinolide aqueous solution,and the effect of 0.0016%28-epihomobrassino-lide aqueous solution was superior to that of 0.01%24-epibrassinolide soluble concentrate.Meanwhile,compared with the CK,the content of soluble protein,free amino acids,soluble sugar and vitamin C in Chinese cabbage treated with the four brassinolide agents were all increased,and the quality traits were improved.Among these agents,in 2024,the enhancement effect of 0.004%28-epihomobrassinolide aqueous solution was superior to that of 0.004%propionyl brassi-nolide soluble concentrate,in 2025,the effect of 0.0016%28-epihomobrassinolide aqueous solution was superior to that of 0.01%24-epibrassinolide soluble concentrate.In addition,the enhancement effects of the four agents applied at the rosette stage of Chinese cabbage were better than those applied at the seedling stage.In conclusion,all the four agents could promote the growth and quality improvement of Chinese cabbage,with the application effect at the rosette stage being superior to that at the seedling stage.Among them,0.001 6%28-epihomobrassinolide aqueous solution exhibited the best performance in improving agronomic trait indices and increasing yield;both 0.004%28-epihomobrassinolide aqueous solution and 0.001 6%28-epihomobrassinolide aqueous solution showed the optimal effects in enhancing Chinese cabbage quality,and thus could be popularized and applied in production.