Scholarlink

<p>Phosphorus (P) deficiency is a major constraint to cowpea productivity in the highly nutrient-degraded soil of West African Guinea Savannah. Thus, the role of P acquisition and utilization efficiencies in yield stability, seasonal response consistency, rhizosphere nutrient dynamics and soil fertility regeneration were investigated. Nine genotypes were evaluated under four P rates (0, 20, 40, 60&#xa0;kg P₂O₅ ha⁻1) across two seasons (years). P-use efficiency was partitioned into uptake (PUpE) and utilization (PUtE). AMMI and network analyses assessed G × P interactions and stability, while post-harvest soil analyses quantified fertility effects. Genotype × phosphorus (G × P) significantly affected grain yield (<i>P</i> &lt; 0.01) with stable seasonal patterns. Three strategies emerged: acquisition-driven (TVX 3236; PUpE 53.89%; 3,850&#xa0;kg&#xa0;ha⁻1 at 20&#xa0;kg P₂O₅ ha⁻1), utilization-driven (IT08K-150–12; PUtE 446.43&#xa0;kg seed kg⁻1 P), and phosphorus-insensitive types. PUpE was the strongest yield predictor (<i>r</i> = 0.87), while uptake plateaued beyond 20&#xa0;kg P₂O₅ ha⁻1, indicating saturation. Phosphorus availability altered population dynamics, shifting yield–survival relationships from negative under deficiency (<i>r</i> = − 0.67) to positive under adequate supply (<i>r</i> = 0.45). Elite genotypes (IT08K-150–12, TVX 3236) improved post-harvest soil N (up to 55%), organic carbon, and micronutrients, supporting genotype-targeted fertilization strategies under low-input systems. Phosphorus uptake efficiency is the primary driver of yield stability in phosphorus-limited savannah systems and is consistent across seasons. Genotype-specific P management (20–60&#xa0;kg P₂O₅ ha⁻1) is more effective than blanket fertilization. P-efficient genotypes enhance soil fertility through improved nitrogen fixation and carbon enrichment. TVX 3236, IT08K-150–12, and IT08K-150–24 are promising for resource-efficient cowpea production in P-limited savannah systems.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Genotypic Variation in Phosphorus-Use Efficiency Underpins Yield Stability and Drives Soil Regeneration in Cowpea (Vigna unguiculata L. Walp.)

  • 期刊论文

  • 发表日期：

    2026年6月27日

查看全文
  • Olawale Mashood Aliyu,
  • Kafayat Temitope Oladimeji,
  • Yusuf Folorunsho Abdulkareem,
  • Toyeeb Alabi,
  • Tajudeen Afimoh Olajide,
  • Wasilat Mojirola Muhammed

摘要

Phosphorus (P) deficiency is a major constraint to cowpea productivity in the highly nutrient-degraded soil of West African Guinea Savannah. Thus, the role of P acquisition and utilization efficiencies in yield stability, seasonal response consistency, rhizosphere nutrient dynamics and soil fertility regeneration were investigated. Nine genotypes were evaluated under four P rates (0, 20, 40, 60 kg P₂O₅ ha⁻1) across two seasons (years). P-use efficiency was partitioned into uptake (PUpE) and utilization (PUtE). AMMI and network analyses assessed G × P interactions and stability, while post-harvest soil analyses quantified fertility effects. Genotype × phosphorus (G × P) significantly affected grain yield (P < 0.01) with stable seasonal patterns. Three strategies emerged: acquisition-driven (TVX 3236; PUpE 53.89%; 3,850 kg ha⁻1 at 20 kg P₂O₅ ha⁻1), utilization-driven (IT08K-150–12; PUtE 446.43 kg seed kg⁻1 P), and phosphorus-insensitive types. PUpE was the strongest yield predictor (r = 0.87), while uptake plateaued beyond 20 kg P₂O₅ ha⁻1, indicating saturation. Phosphorus availability altered population dynamics, shifting yield–survival relationships from negative under deficiency (r = − 0.67) to positive under adequate supply (r = 0.45). Elite genotypes (IT08K-150–12, TVX 3236) improved post-harvest soil N (up to 55%), organic carbon, and micronutrients, supporting genotype-targeted fertilization strategies under low-input systems. Phosphorus uptake efficiency is the primary driver of yield stability in phosphorus-limited savannah systems and is consistent across seasons. Genotype-specific P management (20–60 kg P₂O₅ ha⁻1) is more effective than blanket fertilization. P-efficient genotypes enhance soil fertility through improved nitrogen fixation and carbon enrichment. TVX 3236, IT08K-150–12, and IT08K-150–24 are promising for resource-efficient cowpea production in P-limited savannah systems.

Graphical Abstract