Journal of Zhejiang Agricultural Sciences ›› 2025, Vol. 66 ›› Issue (1): 158-162.DOI: 10.16178/j.issn.0528-9017.20230962

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Control effects of different concentrations of two herbicides, single agent and compound agent on broad-leaved weeds in rapeseed field

HUANG Qian()   

  1. Tongzhou District Plant Protection Station of Nantong City, Nantong 226300, Jiangsu
  • Received:2023-09-27 Online:2025-01-11 Published:2025-01-14

Abstract:

In order to screen the efficient and safe chemical herbicides for weeds in direct seeding rape field in Jiangsu Province, 50% chlorchloride, 30% ammonia·dichloropyridine and their compounds were sprayed on the stem and leaves of weeds at the seedling stage of rape field, and the control effects after the spraying were compared. The results showed that the optimal treatment was 30 mL of 50% chlorchloride suspension and 30 mL of 30% ammonia·dichloropyridine for 667 m2 to control Medicago minima, Phytolacca acinosa Roxb. and Galium spurium. The plant control efficacy of 30 mL of 50% chlorchloride suspension and 30 mL of 30% ammonia·dichloropyridine for 667 m2 on broad-leaved weeds was 85.73% 14 days after spraying, which was significantly better than that of 60 mL of 50% chlorchloride suspension for 667 m2. The plant and fresh weight control efficacy of optimal treatment of 105 days after spraying were 96.82% and 96.46%, respectively, and the plant control effect was significantly better than that of 50 mL 30% ammonia·dichloropyrimida, 60 and 80 mL 50% chlorchloride suspension. The fresh weight control effect of 105 days after spraying was significantly better than that of 50 mL 30% ammonia·dichloropyrimida, and very significantly better than that of 60 and 80 mL 50% chloropyridin treatment.

Key words: rape, herbicide, 50% chlorchloride, 30% ammonia·dichloropyrimida, control effect, broad-leaved weeds

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