| Effect of cotton topping formula, flumetralin and trifluralin, on agronomic traits and resistance of cotton |
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| DOI：10.7606/j.issn.1000-7601.2019.06.11 |
| Key Words: cotton topping flumetralin trifluralin agronomic characters resistance |
| Author Name | Affiliation | | CHEN Jialin | College of Plant Science, Tarim University, Alaer, Xinjiang 843300, China | | LI Zhenyuan | College of Plant Science, Tarim University, Alaer, Xinjiang 843300, China | | WAN Sumei | College of Plant Science, Tarim University, Alaer, Xinjiang 843300, China | | Hu Shoulin | College of Plant Science, Tarim University, Alaer, Xinjiang 843300, China | | CHEN Guodong | College of Plant Science, Tarim University, Alaer, Xinjiang 843300, China | | DONG Hongqiang | College of Plant Science, Tarim University, Alaer, Xinjiang 843300, China |
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| Abstract: |
| To screen suitable topping chemicals for cotton in southern Xinjiang, a cotton topping experiment was carried out in Alar cotton reclamation area in 2017 and 2018. Flumetralin and trifluralin mixed in five ratios of 1∶1, 2∶1, 3∶1, 4∶1, and 5∶1, and the spraying effects of the mixture on plant shape, yield, and fiber quality of cotton were studied. The results showed that with the increase of trifluralin ratio, the cotton plant height increase was slow between 30 and 60 days after application, which indicated the lasting effect on cotton top increased. In contrast, with the increase of flumetralin ratio, cotton canopy size was smaller, meaning more compact plant shape. Among all the formulas, the highest cotton yield was obtained with the mixture of flumetralin and trifluralin at ratio of 3∶1, and the seed cotton yield per unit area was 6 036±162 kg·hm-2. Compared with the manual topping treatment, the average plant height of cotton with the treatment of 3∶1 ratio increased by 7.5±1.6 cm, whereas, no significant differences were observed for the seed cotton yield per unit area, fiber percent, fiber length and fiber elongation, the POD and SOD in cotton leaves increased by 17.8% and 7.1%, respectively, which indicated that the 3∶1 ratio improved tolerance of cotton to high temperature stress. |
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