Acta Agriculturae Zhejiangensis ›› 2025, Vol. 37 ›› Issue (10): 2129-2137.DOI: 10.3969/j.issn.1004-1524.20241075

• Plant Protection • Previous Articles     Next Articles

Weed control efficacy and wheat yield in no-tillage rotary sowing after rice stubble

LIU Shengnan1(), ZHU Jianyi1, LI Ming2, ZHAO Haoyu1, XIONG Tao2, TANG Yonglu2, ZHOU Xiaogang1, LI Chaosu2,*()   

  1. 1. Institute of Plant Protection, Key Laboratory of Integrated Pest Management on Crops in Southwest China, Ministry of Agriculture and Rural Affairs, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China
    2. Crop Research Institute(Germplasm Center of Sichuan Province), Sichuan Academy of Agricultural Sciences, Chengdu 610061, China
  • Received:2024-12-11 Online:2025-10-25 Published:2025-11-13

Abstract:

To investigate the characteristics of weed communities and effective control strategies in no-tillage rotary sown wheat fields after rice stubble in Sichuan, five weed management regimes were established during the wheat growing seasons from 2019 to 2021: no weed control throughout the growth period (CK), weed control at early tillering stage (T1), weed control before wheat seeding and at the early tillering stage (T2), weed control before wheat seeding (T3), weed control during wheat seeding and sprout (T4). The study analyzed species composition, population density, fresh weight of weed, and wheat yield. Results indicated that a total of 16 weed species were identified in the wheat fields, with 11 species recorded in 2019-2020 and 13 species recorded in 2020-2021. Polypogon fugax was the sole dominant grass weed, whereas Galium spurium and Cardamine occulta were the primary broadleaf weeds. The number of weed species per treatment ranged from 3 to 7, while T4 treatment consistently showed the lowest diversity, with only 2 to 4 species. Although total weed density varied significantly between the two years, both CK and T3 treatments showed peak weed density at the early jointing stage of wheat. T4 treatment maintained consistently low weed density and fresh weight, while T1 and T2 treatments effectively suppressed weeds after application. Wheat yield was primarily influenced by spike number and grains per spike. In 2020, T1, T2, and T4 treatments increased wheat yield by 5.85%, 15.92% and 14.42%, respectively, under higher weed pressure. In 2021, only T2 and T4 treatments showed yield improvements. For wheat fields employing the no-tillage rotary sowing after rice stubble, both T2 and T4 treatments demonstrated effective weed suppression and significant yield enhancement. The choice between these two methods should be based on the specific weed infestation conditions encountered during production.

Key words: wheat field, no-tillage rotary sowing after rice stubble, weeding pattern, weed community, control efficacy, yield

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