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<p>This study explored the residual effect of low C: N ratio chickpea residue and high C: N ratio rice straw, along with mineral phosphorus (P) in calcareous soil with a legacy of three pre-sowing moisture regimes. The fertilizer treatments included: no P fertilization, mineral P, ½ mineral P + ½ chickpea straw, ½ mineral P + ½ rice straw, chickpea and rice straw alone, along with three moisture regimes (dry spell at 40% WHC, alternate D/W cycle at 40% and 60% WHC, moist maintained at 60%WHC). Fertilizer treatments under varied moisture regimes showed differential effects on microbial biomass carbon (MBC), microbial biomass phosphorus (MBP), and soil available P. The highest MBC and MBP values were observed with rice straw application. While more soil available P was found with the integrated application of mineral P and chickpea straw. Integrated application of ½ mineral P + chickpea straw produced a more positive effect on maize growth, physiological traits, and P uptake. Among pre-sowing moisture treatments, the alternate D/W cycle caused more stimulation of P availability to the maize crop compared to continuous moist and dry conditions. Moreover, our findings suggest that drought-triggered MBP further depletes soil available P. The effect of the alternate D/W cycle on P mobilization was strong, as a bigger portion of P is bound by microbes in P-deficient soil, which are inclined to release upon rewetting. The addition of chickpea straw along with mineral fertilizer during the pre-sowing soil D/W cycle improved P availability in the calcareous soil.</p>

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Enhancing Phosphorus Availability in Calcareous Soil through Integrated Crop Straw and Mineral Fertilizer Application Under Varied Moisture Regimes

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Naila Farooq,
  • Ali Majrashi,
  • Muhammad Ather Nadeem,
  • Tasawer Abbas

摘要

This study explored the residual effect of low C: N ratio chickpea residue and high C: N ratio rice straw, along with mineral phosphorus (P) in calcareous soil with a legacy of three pre-sowing moisture regimes. The fertilizer treatments included: no P fertilization, mineral P, ½ mineral P + ½ chickpea straw, ½ mineral P + ½ rice straw, chickpea and rice straw alone, along with three moisture regimes (dry spell at 40% WHC, alternate D/W cycle at 40% and 60% WHC, moist maintained at 60%WHC). Fertilizer treatments under varied moisture regimes showed differential effects on microbial biomass carbon (MBC), microbial biomass phosphorus (MBP), and soil available P. The highest MBC and MBP values were observed with rice straw application. While more soil available P was found with the integrated application of mineral P and chickpea straw. Integrated application of ½ mineral P + chickpea straw produced a more positive effect on maize growth, physiological traits, and P uptake. Among pre-sowing moisture treatments, the alternate D/W cycle caused more stimulation of P availability to the maize crop compared to continuous moist and dry conditions. Moreover, our findings suggest that drought-triggered MBP further depletes soil available P. The effect of the alternate D/W cycle on P mobilization was strong, as a bigger portion of P is bound by microbes in P-deficient soil, which are inclined to release upon rewetting. The addition of chickpea straw along with mineral fertilizer during the pre-sowing soil D/W cycle improved P availability in the calcareous soil.