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Evaluation of the P availability of Gafsa phosphate rock in several soils using 32P isotopic dilution method

hal.structure.identifierInstitut National Agronomique de Tunisie [INAT]
dc.contributor.authorBENDALY, Mouna
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorMOLLIER, Alain
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorMOREL, Christian
hal.structure.identifierInstitut National Agronomique de Tunisie [INAT]
dc.contributor.authorBEN MIMOUN, Mehdi
dc.date.accessioned2024-04-08T11:58:55Z
dc.date.available2024-04-08T11:58:55Z
dc.date.issued2014
dc.date.conference2014-08-26
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195961
dc.description.abstractEnThis study aims to test the effectiveness of Gafsa phosphate rock (GPR) use as phosphate fertilizer compared to water soluble fertilizer as triple super phosphate (TSP). An experiment was carried out to evaluate different soil chemical properties that control P solubility and mobility from GPR using the 32P isotopic kinetic method. Seven soils with different soil pH were mixed with GPR and TSP at three rates (0, 500, 2000 mg P/kg) corresponding to localized P fertilization usually applied in orchard. The treatments were replicated three times and incubated for one month in moist conditions. Changes in the amount of isotopically exchangeable P (E) and the amount of P transferred from the solid constituents to the soil solution after different periods (Pr) as well as changes in pH, Ca and P concentrations in soils suspensions were determined. The relative efficiency of the GPR to water soluble fertilizer in the seven soils was with an increase in soil acidity. For each soil, the relative efficiency varied differently for the two P applications rates of GPR. In fact, it was noticed that in two soils with different pH (5.5 and 6.2), the relative efficiency decreased with the high P rate of GPR. This result may be explained by a liming effect of GPR resulting in a high increase of pH and the calcium concentration in these soils limits the GPR dissolution and reduces mobility of soluble P in soil solution. These results contrast with the one obtained for a soil with pH (6.5) because of its high pH buffering capacity. Our results demonstrate the importance of considering the soil properties to evaluate the GPR efficiency and manage GPR fertilization.
dc.language.isoen
dc.title.enEvaluation of the P availability of Gafsa phosphate rock in several soils using 32P isotopic dilution method
dc.typeAutre communication scientifique (congrès sans actes - poster - séminaire...)
dc.subject.halSciences du Vivant [q-bio]/Sciences agricoles
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.conference.title5th Phosphorus in Soils and Plants International Symposium
bordeaux.countryFR
bordeaux.conference.cityMontpellier
bordeaux.peerReviewedoui
hal.identifierhal-02741622
hal.version1
hal.invitednon
hal.conference.end2014-08-29
hal.popularnon
hal.audienceNationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02741622v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2014&rft.au=BENDALY,%20Mouna&MOLLIER,%20Alain&MOREL,%20Christian&BEN%20MIMOUN,%20Mehdi&rft.genre=conference


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