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<p>Farmers can improve site-specific management practices by understanding soybean yield variability. This study evaluated the effects of <i>Bradyrhizobium japonicum</i> bioinoculant (INC) on three soybean varieties (V) across three distinct topographic positions (TPs): shoulder, backslope, and footslope. Results demonstrated that the shoulder produced significantly higher yields, with an increase of 276&#xa0;kg ha⁻¹ in 2022 and 103&#xa0;kg ha⁻¹ when averaged over two years compared to the non-treated control (NTC). The footslope showed substantial yield gain with INC, with an increase of 955&#xa0;kg ha⁻¹ in 2022 and 506&#xa0;kg ha⁻¹ averaged over the study period. Plant height varied significantly by TP, with the backslope producing the tallest plants (93&#xa0;cm). In 2023, a significant TP × INC × V interaction (<i>p</i><i> = 0.03</i>) was observed, where INC resulted in a 10% higher root dry weight at the shoulder but a 5% and 7% reduction at the backslope and footslope, respectively, compared to NTC. A strong correlation (<i>R² = 0.46</i>) between seed yield and root diameter under INC suggests that increased root diameter at the shoulder position may enhance soybean yields. These findings emphasize the potential of bioinoculants and targeted topographic-site-specific strategies to optimize soybean productivity and support improved crop management.</p>

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Enhancing Soybean Yields Through Bioinoculants and Topographic Position Site-Specific Management Strategies

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Mehtab Muhammad Aslam,
  • Gurbir Singh,
  • Kelly A. Nelson,
  • Gurpreet Kaur

摘要

Farmers can improve site-specific management practices by understanding soybean yield variability. This study evaluated the effects of Bradyrhizobium japonicum bioinoculant (INC) on three soybean varieties (V) across three distinct topographic positions (TPs): shoulder, backslope, and footslope. Results demonstrated that the shoulder produced significantly higher yields, with an increase of 276 kg ha⁻¹ in 2022 and 103 kg ha⁻¹ when averaged over two years compared to the non-treated control (NTC). The footslope showed substantial yield gain with INC, with an increase of 955 kg ha⁻¹ in 2022 and 506 kg ha⁻¹ averaged over the study period. Plant height varied significantly by TP, with the backslope producing the tallest plants (93 cm). In 2023, a significant TP × INC × V interaction (p = 0.03) was observed, where INC resulted in a 10% higher root dry weight at the shoulder but a 5% and 7% reduction at the backslope and footslope, respectively, compared to NTC. A strong correlation (R² = 0.46) between seed yield and root diameter under INC suggests that increased root diameter at the shoulder position may enhance soybean yields. These findings emphasize the potential of bioinoculants and targeted topographic-site-specific strategies to optimize soybean productivity and support improved crop management.