{
  "abstract": "Phosphorus (P) deficiency limits crop productivity in tropical acidic soils, yet information on P sorption dynamics across land uses is scarce in southern Ethiopia. This study evaluated P sorption and estimated external P requirements (EPR) for four land uses (coffee, enset, cultivated, eucalyptus) in Bule Hora district. Twenty-four composite soil samples (0–20 cm) were analyzed, and P sorption data fitted to Langmuir and Freundlich isotherms. EPR was defined as the theoretical P required to maintain 0.2 mg P L−1 in soil solution under laboratory conditions, as a comparative reference, not a field fertilizer recommendation. Soils were clayey, acidic (pH 4.99–5.68), with very low soil available P (<5 mg P kg−1). The Langmuir model best described sorption (R 2 = 0.89–0.98). Sorption maxima ranged 164.8–264.6 mg P kg −1 , and EPR 97.0–192.9 mg P kg −1 ; highest in cultivated and eucalyptus lands. The current DAP recommendation (100 kg ha −1 , 18-46-0) supplies ∼20.1 kg P ha −1 , equivalent to ∼8.4 mg P kg −1 . This is only 4.6–6.4% of the laboratory-derived EPR for cultivated land (131–183 mg P kg −1 ) required to maintain 0.2 mg P L −1 . Xm correlated positively with clay (r = 0.75) and negatively with organic matter (r = −0.75) and available P (r = −0.73). We conclude that Bule Hora soils have high P fixation. These EPR values require field validation before revising recommendations. Site-specific management combining validated EPR-based rates, organic matter amendments, and targeted liming may enhance P use efficiency and sustain productivity in these strongly sorbing soils.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "name": "Daniel Manore"
    },
    {
      "name": "Mengistu Liramo"
    },
    {
      "name": "Wassie Haile"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e7y9cd0hgyt49.bib",
  "cited_by": 0,
  "doi": "10.1177/11786221261502407",
  "fulltext_url": "https://doi.org/10.1177/11786221261502407",
  "id": "e7y9cd0hgyt49",
  "issns": [
    "1178-6221"
  ],
  "landing_url": "https://doi.org/10.1177/11786221261502407",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "lcc",
      "GE1-350"
    ],
    [
      "openalex",
      "2311|Phosphorus and nutrient management"
    ]
  ],
  "openalex": "W7223969336",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": "SAGE Publishing",
  "ris": "https://research.draconitic.com/paper/e7y9cd0hgyt49.ris",
  "sources": [
    {
      "first_seen": "2026-10-31T14:21:55Z",
      "native_id": "0b839ea0a9364e3d85bbc506e09cdb53",
      "source": "doaj",
      "url": "https://doi.org/10.1177/11786221261502407"
    }
  ],
  "subjects": [
    {
      "field": "earth",
      "origin": "openalex:2311|Phosphorus and nutrient management",
      "subfield": "environmental-science"
    }
  ],
  "title": "Land Use Impacts on Phosphorus Sorption Isotherms: A Critical Assessment for Site-Specific Fertilizer Management in the Highlands of Southern Ethiopia",
  "title_text": "Land Use Impacts on Phosphorus Sorption Isotherms: A Critical Assessment for Site-Specific Fertilizer Management in the Highlands of Southern Ethiopia",
  "type": "peer-reviewed",
  "updated_at": "2026-10-31T14:21:55Z",
  "url": "https://research.draconitic.com/paper/e7y9cd0hgyt49",
  "venue": "Air, Soil and Water Research",
  "versions": []
}