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<p>Phosphorus (P) is essential for plant growth, but its fixation and transformation into less accessible forms limits its availability to the plant. The pathways of P transformation, underlying controlling factors and their effective management present a critical knowledge gap that needs to be addressed. So, this study was undertaken to gain insights into the P dynamics in an acid Alfisol of north-western Himalayan region.&#xa0;The study utilized a 50-year-old long-term fertilizer experiment comprising eleven fertilization regimes. Sequential fractionation, redundancy analysis, and structural equation modelling were employed to highlight significant alterations in soil P fractions under different treatments.&#xa0;Non-labile P was the predominant pool (51.2%), followed by moderately-labile (34.8%) and labile (14.0%) pools. The phosphorus activity coefficient (PAC), maize yield, and P uptake were maximum under 100% NPK + FYM (farmyard manure) and 100% NPK + lime, with significant improvements over 100% NPK alone. In contrast, continuous P omission resulted in a substantial depletion of total soil P. Pearson’s correlation and redundancy analysis revealed strong positive associations between P fractions, soil organic carbon (SOC), and nutrient availability. Labile and moderately-labile P pools exhibited strong positive correlations with maize yield and P uptake. Structural equation modelling further identified labile P as the primary contributor to available P, while available nitrogen emerged as a key driver of P transformation.&#xa0;In conclusion, the application of FYM and lime, alongside balanced fertilization, is crucial for optimizing P dynamics and for improving and sustaining the agricultural productivity of acidic soils.</p>

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Understanding the Phosphorus Dynamics in an Acid Alfisol Through Structural Equation Modelling

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • RS Aparna,
  • Raj Paul Sharma,
  • Narender Kumar Sankhyan,
  • Anjali Thakur

摘要

Phosphorus (P) is essential for plant growth, but its fixation and transformation into less accessible forms limits its availability to the plant. The pathways of P transformation, underlying controlling factors and their effective management present a critical knowledge gap that needs to be addressed. So, this study was undertaken to gain insights into the P dynamics in an acid Alfisol of north-western Himalayan region. The study utilized a 50-year-old long-term fertilizer experiment comprising eleven fertilization regimes. Sequential fractionation, redundancy analysis, and structural equation modelling were employed to highlight significant alterations in soil P fractions under different treatments. Non-labile P was the predominant pool (51.2%), followed by moderately-labile (34.8%) and labile (14.0%) pools. The phosphorus activity coefficient (PAC), maize yield, and P uptake were maximum under 100% NPK + FYM (farmyard manure) and 100% NPK + lime, with significant improvements over 100% NPK alone. In contrast, continuous P omission resulted in a substantial depletion of total soil P. Pearson’s correlation and redundancy analysis revealed strong positive associations between P fractions, soil organic carbon (SOC), and nutrient availability. Labile and moderately-labile P pools exhibited strong positive correlations with maize yield and P uptake. Structural equation modelling further identified labile P as the primary contributor to available P, while available nitrogen emerged as a key driver of P transformation. In conclusion, the application of FYM and lime, alongside balanced fertilization, is crucial for optimizing P dynamics and for improving and sustaining the agricultural productivity of acidic soils.