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<p>Crop diversification, particularly through integration of nutrient-enriching legume-based systems, is essential for improving soil micronutrient availability through their transformations in soil. The present study, conducted at Punjab Agricultural University, Ludhiana, evaluated the effects of crop diversification on distribution and transformation of operationally defined micronutrient fractions in soil and their relationship with DTPA-extractable micronutrients. There were noticeable variations in all micronutrient fractions studied, emphasizing the significance of crop selection on micronutrient dynamics. Among the cropping systems evaluated, the soybean-wheat system enhanced the soil organic carbon and labile micronutrient pools, including water soluble + exchangeable (WS + EX)-Zn, Mn and Cu (9.0, 0.99 and 0.05&#xa0;mg&#xa0;kg<sup>−1</sup>, respectively), specifically adsorbed (SpAd)-Mn (4.37&#xa0;mg&#xa0;kg<sup>−1</sup>) and organically bound (OM)-Cu, Mn and Zn (0.78, 7.87 and 37.9&#xa0;mg&#xa0;kg<sup>−1</sup>, respectively). The residual (unavailable pool) fraction accounted for the largest pool (~ 70%), yet plant uptake was more strongly correlated with the labile and organically bound micronutrient forms. Path and correlation analysis revealed strong positive relationships and underscored the importance of soluble, specifically adsorbed and organically bound fractions in regulating micronutrient availability. These findings highlighted the pivotal role of crop diversification with legumes in facilitating the redistribution of micronutrients from unavailable to plant-accessible forms, offering a strategic pathway to improve micronutrient cycling, soil fertility, and crop productivity in medium-term field experimentation.</p> Graphical abstract <p></p>

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Crop diversification drives transformations of soil micronutrient fractions and uptake

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Sharanjit Kaur Brar,
  • Salwinder Singh Dhaliwal,
  • Vivek Sharma,
  • Manpreet Kaur

摘要

Crop diversification, particularly through integration of nutrient-enriching legume-based systems, is essential for improving soil micronutrient availability through their transformations in soil. The present study, conducted at Punjab Agricultural University, Ludhiana, evaluated the effects of crop diversification on distribution and transformation of operationally defined micronutrient fractions in soil and their relationship with DTPA-extractable micronutrients. There were noticeable variations in all micronutrient fractions studied, emphasizing the significance of crop selection on micronutrient dynamics. Among the cropping systems evaluated, the soybean-wheat system enhanced the soil organic carbon and labile micronutrient pools, including water soluble + exchangeable (WS + EX)-Zn, Mn and Cu (9.0, 0.99 and 0.05 mg kg−1, respectively), specifically adsorbed (SpAd)-Mn (4.37 mg kg−1) and organically bound (OM)-Cu, Mn and Zn (0.78, 7.87 and 37.9 mg kg−1, respectively). The residual (unavailable pool) fraction accounted for the largest pool (~ 70%), yet plant uptake was more strongly correlated with the labile and organically bound micronutrient forms. Path and correlation analysis revealed strong positive relationships and underscored the importance of soluble, specifically adsorbed and organically bound fractions in regulating micronutrient availability. These findings highlighted the pivotal role of crop diversification with legumes in facilitating the redistribution of micronutrients from unavailable to plant-accessible forms, offering a strategic pathway to improve micronutrient cycling, soil fertility, and crop productivity in medium-term field experimentation.

Graphical abstract