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<p>To assess short-term changes in nutrient uptake, plant stoichiometric balance, and fertilizer-borne trace metal inputs in ryegrass (<i>Lolium perenne</i> L.) following the application of poultry manure (PM), rock phosphate (RP), and their mixture (PMRP) under contrasting soil pH conditions. A seven-week greenhouse experiment was conducted using two soils with contrasting pH (moderately acid and alkaline). Soils were amended with PM, RP, or PMRP at an equivalent rate of 100 mg P kg⁻¹ soil. Soil concentrations of Co, Cr, Cu, Mn, Ni, Pb, Zn, and Fe were determined by aqua regia digestion and ICP–OES. Plant biomass production, nutrient uptake (N, P, K, Ca, Mg, Na), C:N: P stoichiometry, and nutrient translocation were quantified in shoots and roots. Treatment effects were evaluated using two-way ANOVA followed by Tukey’s HSD test (p ≤ 0.05). PM significantly increased N, P, and K uptake (1.4–3.4-fold relative to the control), particularly in acidic soil, whereas RP showed limited effectiveness under alkaline conditions. PMRP resulted in intermediate nutrient acquisition. Stoichiometric ratios (C: P and N: P) indicated a clear alleviation of P limitation under PM and PMRP. Although soil trace metal concentrations increased after amendment application (PM &gt; PMRP &gt; RP), all values remained well below phytotoxic thresholds, and metals were not detected in plant tissues. Organic-based amendments, particularly PM, rapidly improved nutrient use efficiency and plant stoichiometric balance without inducing short-term trace metal risks.</p>

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Short-term Effects of Poultry Manure and Rock Phosphate on Soil Chemistry and Nutrient Uptake in Ryegrass Under Two Contrasting Soils

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Patricia Poblete-Grant,
  • Jonathan Suazo-Hernández,
  • Leyla Parra-Almuna,
  • Sofía Pontigo,
  • Rayen Millaleo,
  • María de La Luz Mora,
  • Philippe Biron,
  • Cornelia Rumpel

摘要

To assess short-term changes in nutrient uptake, plant stoichiometric balance, and fertilizer-borne trace metal inputs in ryegrass (Lolium perenne L.) following the application of poultry manure (PM), rock phosphate (RP), and their mixture (PMRP) under contrasting soil pH conditions. A seven-week greenhouse experiment was conducted using two soils with contrasting pH (moderately acid and alkaline). Soils were amended with PM, RP, or PMRP at an equivalent rate of 100 mg P kg⁻¹ soil. Soil concentrations of Co, Cr, Cu, Mn, Ni, Pb, Zn, and Fe were determined by aqua regia digestion and ICP–OES. Plant biomass production, nutrient uptake (N, P, K, Ca, Mg, Na), C:N: P stoichiometry, and nutrient translocation were quantified in shoots and roots. Treatment effects were evaluated using two-way ANOVA followed by Tukey’s HSD test (p ≤ 0.05). PM significantly increased N, P, and K uptake (1.4–3.4-fold relative to the control), particularly in acidic soil, whereas RP showed limited effectiveness under alkaline conditions. PMRP resulted in intermediate nutrient acquisition. Stoichiometric ratios (C: P and N: P) indicated a clear alleviation of P limitation under PM and PMRP. Although soil trace metal concentrations increased after amendment application (PM > PMRP > RP), all values remained well below phytotoxic thresholds, and metals were not detected in plant tissues. Organic-based amendments, particularly PM, rapidly improved nutrient use efficiency and plant stoichiometric balance without inducing short-term trace metal risks.