关键词: 棉田, 三氟啶磺隆钠盐, 扑草净, 混用配方

Abstract: In order to screen high efficient and safe post-emergence herbicide mixed formulations for the multiplicity weeds in cotton fields of Xinjiang, this paper determined the activity of trifloxysulfuron sodium and prometryn on the weeds and safety of cotton plant under field test condition, and evaluated the combined effect of these 2 types by Gowing method. The results showed that the control effect of plant number and fresh weight of tested weeds after applying mixed herbicide were higher than just by single agent. The range of plant number control efficiency and fresh weight growth rate were -3.24%~4.53%, -5.86%~3.11%, respectively. 30 d after application, the control effect of single applying trifloxysulfuron sodium 15 g/hm2 was the lowest, only 70.82%. The control effect of the single applying prometryne 150 g/hm2 on fresh weight was lower, only 79.21%. In the compounding treatment, the control effects of trifloxysulfuron sodium 15 g/hm2+ prometryn 150 g/hm2 were higher, 99.05% and 96.09%, respectively, and the growth rates were the highest, 4.53% and 3.11%, respectively. The treatment of single applying trifloxysulfuron sodium was safe for cotton plants, showing a significant difference with the other treatments. The phytotoxicity index of prometryn 250 g/hm2 was 47.53%, resulting in chlorosis of leaves and bringing a greater damage to cotton plants. Considering the herbicidal activity and cotton plant safety, the combination of trifloxysulfuron sodium 15 g/hm2 + prometryn 150 g/hm2 had good performance and could be used as an efficient and safe herbicide compounding combination in cotton fields of northern Xinjiang.

Key words: cotton field, trifloxysulfuron sodium, prometryn, mixed formulation