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Phosphorus fertility recapitalization of nutrient-depleted tropical acid soils with reactive phosphate rock: An assessment using the isotopic exchange technique

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Abstract

A “soil P fertility recapitalization” initiative utilizinglarge rates of phosphate rocks (PRs) was proposed to improve the soil P statusand increase the sustainable food production in acid and P-deficient tropicalsoils. Two series of experiments were carried out using five tropical acidsoilstreated with heavy applications of Gafsa phosphate rock (GPR). In the firstseries, the soils were mixed with GPR at the following application rates: 0,500, 1000 and 2000 mg P·kg−1, andincubatedfor one month in moist conditions. In another series, 1000 mg Pkg−1 applied as GPR was added to three soils andincubated for 1.5 month; thereafter 50 mg P kg−1as triple superphosphate (TSP) were added. The 32P isotopic exchangemethod was utilized to assess the contribution of GPR to the available soil P.Changes in amounts, E, of P transferred with time as phosphate ions from thesoil particles to the soil solution as well as changes in pH, calcium andphosphate concentrations in soil suspensions were determined. It was foundthat:(i) the contribution of P from GPR to recapitalization of soil P fertility wasmainly assessed by E pool size, pH, calcium and phosphate concentrations; othervariables were not significant at the 0.1 level; (ii) heavy applications of GPRdid not saturate all the P sorption sites, P freshly applied as water-soluble Pwas still sorbed; (iii) recapitalization of soil P fertility using GPR waspartly obtained in some acid tropical soils; (iv) Upon dissolution, GPRprovidedcalcium ions to crops and to soils, thus reducing Al toxicity, but its limingeffect was limited. To explain these effects with heavy application rates ofGPR, it was postulated that a coating of Al and Fe compounds is formed aroundPRparticles with time, thus reducing further dissolution.

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Authors and Affiliations

  1. INRA, Département Environnement et Agronomie, Route de Saint Cyr, 78000, Versailles, France

    Jean-Claude Fardeau

  2. IAEA, Soil and Water Management & Crop Nutrition Section. Joint FAO/IAEA Programme, Wagramerst. 5, A-1400, Vienna, Austria

    Felipe Zapata

Authors
  1. Jean-Claude Fardeau
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  2. Felipe Zapata
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Fardeau, JC., Zapata, F. Phosphorus fertility recapitalization of nutrient-depleted tropical acid soils with reactive phosphate rock: An assessment using the isotopic exchange technique. Nutrient Cycling in Agroecosystems 63, 69–79 (2002). https://doi.org/10.1023/A:1020583804556

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