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<p>Field studies were conducted in 2022 and 2023 to determine the critical period of weed control (CPWC) in sugar beet (<i>Beta vulgaris</i> L.) under conventional and narrow-row spacing conditions. The experiments were arranged as a split-plot design within a randomized complete block design with three replications. The main plot was the cultivation system, consisting of conventional row spacing (50 cm) and narrow-row spacing (30 cm). The subplot included weed control treatments: maintaining weed-free conditions for 30, 45, 60, and 75 days after crop emergence (DAE), and weed-infested conditions for the same durations. Additionally, two control treatments were included: season-long weedy and season-long weed-free from sowing to harvest. The beginning and end of the CPWC for each planting method based on a 5% acceptable root yield loss was determined by fitting four-parameter log-logistic model. Weed density and dry biomass were significantly reduced under narrow-row planting, with a 48.68% lower weed dry weight compared to the conventional system. The CPWC for a 5% yield loss ranged from 33 to 116 DAE in narrow rows and 34.9–140 DAE in conventional planting during the first year and 37–61 DAE for narrow rows and 29.5–84.2 DAE for conventional rows in the second year. Narrow-row planting also led to higher root yields under both weed-free and weed-infested conditions. Overall, this study showed that reducing row spacing enhances crop competitiveness, suppresses weed growth, and improves root yield in sugar beet production.</p>

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Impact of Cultivation System on the Critical Period for Weed Control in Sugar Beet

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Karim Sharifan,
  • Mohammad Armin,
  • Matin Jamimoeini

摘要

Field studies were conducted in 2022 and 2023 to determine the critical period of weed control (CPWC) in sugar beet (Beta vulgaris L.) under conventional and narrow-row spacing conditions. The experiments were arranged as a split-plot design within a randomized complete block design with three replications. The main plot was the cultivation system, consisting of conventional row spacing (50 cm) and narrow-row spacing (30 cm). The subplot included weed control treatments: maintaining weed-free conditions for 30, 45, 60, and 75 days after crop emergence (DAE), and weed-infested conditions for the same durations. Additionally, two control treatments were included: season-long weedy and season-long weed-free from sowing to harvest. The beginning and end of the CPWC for each planting method based on a 5% acceptable root yield loss was determined by fitting four-parameter log-logistic model. Weed density and dry biomass were significantly reduced under narrow-row planting, with a 48.68% lower weed dry weight compared to the conventional system. The CPWC for a 5% yield loss ranged from 33 to 116 DAE in narrow rows and 34.9–140 DAE in conventional planting during the first year and 37–61 DAE for narrow rows and 29.5–84.2 DAE for conventional rows in the second year. Narrow-row planting also led to higher root yields under both weed-free and weed-infested conditions. Overall, this study showed that reducing row spacing enhances crop competitiveness, suppresses weed growth, and improves root yield in sugar beet production.