| 摘要 |
[Objectives] To identify the optimal combination of herbicide concentrations appropriate for soil closed weeding in the soybean and corn intercropping system in Zhongwei City. [Methods] Two herbicides, 96% (S)-metolachlor and 75% thifensulfuron methyl, were selected for this experiment. A no-herbicide treatment served as the control, and five concentration gradients of the herbicides were established. Prior to sowing, the soil underwent a closed weeding treatment. The impacts of various herbicide concentration combinations on growth indicators, weed control effect, and the yields of soybean and corn across various treatments were analyzed. [Results] The tested combinations of herbicide concentrations did not result in significant phytotoxicity to soybean and corn seedlings. Furthermore, as the herbicide concentrations increased in each treatment, treatments D and E demonstrated the most effective weed control effect. Specifically, 40 d post application, the plant control effect and fresh weight control effect reached 97.25% and 98.03% for treatment D, and 97.25% and 98.24% for treatment E, respectively. Additionally, the yields of both soybean and corn showed significant increases. [Conclusions] Considering the overall output-input ratio in this region, treatment D, comprising 96% (S)-metolachlor at 1 650 mL/hm2 and 75% thifensulfuron-methyl at 48 g/hm2, can be identified as the herbicide concentration combination that provides the most effective weed control effect in the soybean and corn strip intercropping system. |
