摘要：Field experiments were conducted to study the influence of different concentrations of paclobutra- zol on the agronomic traits, yield and quality of three varieties P.heterophylla. The main results of the test showed that soaking seeds with different concentrations of paclobutrazol promoted the number of roots and the length of the whole plant, and inhibited the diameter of the stem. The 20 mg/L treatment had the largest increase in root number and whole plant length, which were 39.27% and 20.30%, respectively. The diameter of the stem decreased by 9.79% in 2 mg/L treatment. All the 13 agronomy traits showed low concentration inhibition. The effects of soaking seeds with paclobutrazol on the yield and yield components of three P.heterophylla varieties were different. Three P.heterophylla varieties had the highest yield of Qian P.heterophylla No.1, followed by Fengkang No.1. Compared with the control, soaking seeds with different concentrations of paclobutrazol promoted the number of roots and the length of the whole plant, and inhibited the diameter of the stem. The 20 mg/L treatment had the largest increase in root number and whole plant length, which were 39.27% and 20.30%, respectively. Soaking seeds with paclobutrazol improves the quality of three P.heterophylla varieties. Compared with the control, soaking seeds with different concentrations of paclo- butrazol mainly increased the quality of Rhetero- phylla by increasing the content of P.heterophylla extract and total saponins; the contents of extracts of 0.2mg/L, 2mg/L and 20mg/L treatments increased 8.53% and 5.14 %, 5.71% respectively, the total saponin content increased 10.79%, 20.38%, 15.58%, respectively.
