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L’utilisation des fertilisants chimiques dans l’agriculture s’est fortement accentuee ce dernier temps au Mali. En effet l’apport regulier du diammonium phosphate (DAP) peut influencer la mobilite du zinc, car les phosphates fixent cet element. L’etude a pour but d’evaluer l’impact de l’utilisation de ce fertilisant phosphate sur la disponibilite du zinc. Ainsi pour la caracterisation, l’echantillon est analyse par plusieurs methodes physico-chimiques : la diffraction des rayons X et la microscopie electronique a balayage. Des essais d’absorption ont ete realises avec cinq pots numerotes (P0, P1, P2, P3, P4) contenant chacun 1 kg d’echantillon auxquels a ete ajoute respectivement 0 ; 2 ; 4 ; 8 et 10 g du fertilisant. D’autres essais ont ete conduits avec 3 g d’echantillons preleves dans le pot P4, auxquels ont ete applique respectivement 150 ppm, 300 ppm, 450 ppm et 600 ppm de zinc. Il ressort de ce travail que la quantite de Zn retenu est proportionnelle a celle du DAP et que la limite (retention en 21 jours) = 499,9993 ppm > limite (retention en 15 jours) = 499,9991 ppm > limite (retention en 7 jours) = 499,9990 ppm > limite (retention en 1 jour) = 499,9980 ppm. Cette etude a montre que le diammonium phosphate retient le zinc et influence donc sa biodisponibilite.Mots cles : Sol rizicole, Pana au Mali, retention du zinc, impact de l’utilisation, Diammonium phosphate. English Title: Estimate the impact of phosphate diammonium usage on the availability of zinc in a rice producing soil in Mali The use of chemical fertilizers in agriculture has highly increased this last time in Mali. In fact the regular contribution of DAP can influence the mobility of zinc, because the phosphate fix this element. The object of this study is to estimate the impact of this phosphate fertilizer on the availability of zinc. So for the characterization, the sample is analysed through several physico-chemical methods: the X rays diffraction and the sweeping electronic microscopy. Some absorbing tests have been carried out with five numbered pots (P0, P1, P2, P3, P4) containing each 1 kg of sample to which has been added respectively 0; 2; 4; 8 and 10 g of the fertilizer. Other tests have conducted with 3 g samples removed from the pot P4, to which has been applied respectively 150 ppm, 300 ppm, 450 ppm and 600 ppm of zinc. As a result of the work the quantity of zinc retained is proportional to the one of DAP and the limit (retention in 21 days) = 499.9993 ppm > limit (retention in 15 days) = 499.9991 ppm > limit (retention in 7 days) = 499.9990 ppm > limit (retention in 1 day) = 499.9980 ppm. This study has shown that the phosphate diammonium retains the zinc and influences in this case its bioavailability.Keywords: Rice producing soil, Pana in Mali, zinc retention, the impact of the usage, phosphate diammonium.

Evaluation de l’impact de l’utilisation du diammonium phosphate sur la disponibilité du zinc dans un sol rizicole au Mali