Screening of different dropping formulations about mepiquat chloride and their effects on cotton growth and development

作者：Shan-Wei LOU, Fei Gao, Chong WANG, Xiao-Li TIAN, Ming-Wei DU, Liu-Sheng DUAN · 发表于：ACTA AGRONOMICA SINICA · 年份：2023 · DOI：10.3724/sp.j.1006.2023.24034 · 研究领域：Research in Cotton Cultivation、Plant Physiology and Cultivation Studies、Polymer-Based Agricultural Enhancements

The drop method of mepiquat chloride is an important research field in cotton. In order to explore the new sustained-release dropping formulation and its effect on cotton regulation, the following experiments were carried out. The dropping formulations were screened by pot cultivation with five kinds (H1, H2, H3, H4, and H5) of dripping application form, and common mepiquat chloride (S) and water as the control (CK). To investigate the screening of different dosage forms and the effect of regulating cotton agronomic characters and yield, two concentration levels of low and high (90.0 g hm -2 and 180.0 g hm -2 ) were set in the field. The results showed that under pot conditions, the uniformity of five different formulations of mepiquat chloride was basically above 66%, and the seedling growth rate greatly affected by the variety mostly between 40% and 70%. Plant height was reduced by 32%-41% and 24%-35%, respectively, and there was significantly different in plant height after 25 days. Under field conditions, treatment S had the best height control effect, CK increased the fastest, and all treatments had better height control effects at high concentrations of sustained-release mepiquat chloride and were significantly different from CK. At low concentrations, plant height of H5 was 61.0 cm. The effect was similar to S and had no significant difference, and other treatments had no significant difference with CK. Cotton plant width, stem diameter, the number of leaves in main s...