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<p>Groundnut (<i>Arachis hypogaea</i> L.) productivity in acidic red and laterite soils faces dual constraints of inherent soil acidity and phosphorus (P) fixation. Current management strategies often address these constraints independently. We hypothesize that combining reduced lime application with phosphate-solubilizing bacteria (PSB) can synergistically improve P bioavailability and microbial activity than conventional approaches. A three-year field study (2021–2023) employing split-plot design tested this paradigm, comparing two lime treatments (0 vs. 1.2 t ha⁻¹) with six phosphorus-PSB combinations under acidic laterite conditions of eastern India. Lime-PSB synergy increased soil available P by 38% and acid phosphatase activity by 27% versus sole lime application. Native PSB1 strain outperformed non-native PSB2 by 14% in pod yield under non-limed conditions. Despite 25% reduced P fertilization, PSB-integrated treatments maintained equivalent yields to full-P applications with enhanced P use efficiency. Lime-PSB co-application elevated kernel oil content by 9% and boosted P agronomic efficiency by 50%. The convergence of native and non-native PSB performance under limed conditions (yield difference &lt; 3%) reveals pH-mediated microbial niche equalization, enabling flexible strain selection in amended soils. This integrated approach reduced lime requirements by 33% compared to standard recommendations while maintaining soil pH &gt; 5.3 – critical threshold for groundnut calcium uptake. Our results demonstrate that P fertilizer requirements in acidic soils can be reduced by 25% without compromising groundnut productivity through targeted microbial partnerships.</p>

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Beneficial Microorganisms Supplied with Lime and Reduced Dose of Phosphorus Sustains Groundnut (Arachis Hypogea L.) Yield in Red and Laterite Soils of Eastern India

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Arup Sen,
  • Arindam Sarkar,
  • Rajib Kundu,
  • Sanchita Mondal,
  • Ratneswar Poddar,
  • Shubhadip Dasgupta,
  • Benukar Biswas

摘要

Groundnut (Arachis hypogaea L.) productivity in acidic red and laterite soils faces dual constraints of inherent soil acidity and phosphorus (P) fixation. Current management strategies often address these constraints independently. We hypothesize that combining reduced lime application with phosphate-solubilizing bacteria (PSB) can synergistically improve P bioavailability and microbial activity than conventional approaches. A three-year field study (2021–2023) employing split-plot design tested this paradigm, comparing two lime treatments (0 vs. 1.2 t ha⁻¹) with six phosphorus-PSB combinations under acidic laterite conditions of eastern India. Lime-PSB synergy increased soil available P by 38% and acid phosphatase activity by 27% versus sole lime application. Native PSB1 strain outperformed non-native PSB2 by 14% in pod yield under non-limed conditions. Despite 25% reduced P fertilization, PSB-integrated treatments maintained equivalent yields to full-P applications with enhanced P use efficiency. Lime-PSB co-application elevated kernel oil content by 9% and boosted P agronomic efficiency by 50%. The convergence of native and non-native PSB performance under limed conditions (yield difference < 3%) reveals pH-mediated microbial niche equalization, enabling flexible strain selection in amended soils. This integrated approach reduced lime requirements by 33% compared to standard recommendations while maintaining soil pH > 5.3 – critical threshold for groundnut calcium uptake. Our results demonstrate that P fertilizer requirements in acidic soils can be reduced by 25% without compromising groundnut productivity through targeted microbial partnerships.