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Une etude a ete conduite sur une periode de deux ans, a la station de recherche sur le cacao du Centre National de Recherche Agronomique (CNRA) a Divo, en vue d’etudier les effets de la fertilisation organo-phosphatee sur la fertilite et la microvariabilite verticale de la matiere organique, du complexe adsorbant et de quelques equilibres chimiques d’un ferralsol sous cacaoyers en replantation dans la region de Divo. Le dispositif experimental etait un bloc de Fisher a 4 repetitions avec 6 traitements : T 0 (temoin), T 1 (5t.ha -1 de compost), T 2 (5t.ha -1 compost + 184 kg.ha -1 P 2 O 5 ), T 3 (5t.ha -1 compost + 122,6 kg.ha -1 P 2 O 5 ), T 4 (5t.ha -1 compost + 92 kg.ha -1 P 2 O 5 ) et T 5 (184 kg.ha -1 P 2 O 5 ). La dynamique verticale du complexe adsorbant, de la matiere organique et de quelques equilibres chimiques dans les sols sous cacaoyers ont ete evaluees par les evolutions de ces parametres en fonction des traitements et par horizons. Les resultats obtenus ont montre que la fertilisation mixte (organique et minerale) etait meilleure que l’amendement organique ou la fertilisation minerale exclusive vis-a-vis du complexe, de la matiere organique et des equilibres chimiques. Les traitements T2, T3, T4 et T1 ont ameliore les caracteristiques etudiees. Cependant, le traitement T2 s’est revele meilleur pour l’amelioration des caracteristiques etudiees par rapport aux autres traitements (T1, T3, T4). La matiere organique tout en se mineralisant a aussi permis l’accumulation des elements nutritifs en surface surtout pour les regimes de fertilisation mixte, pool de l’absorption racinaire chez le cacaoyer. Cette etude a montre que la nutrition phosphatee des cacaoyers replantes peut etre assuree convenablement avec une fertilisation organo-phosphatee a base de compost et d’une faible dose de TSP. Ces resultats pourraient etre utilises par les producteurs de cacao pour une replantation reussie durable, respectant l’environnement. © 2018 International Formulae Group. All rights reserved. Mots cles: Dynamique verticale, taux de redistribution, fumure organo-minerale, compost de residus d’ecabossage English Title:  Effects of organo-phosphate fertilization on fertility of organic matter and the adsorbent complex on ferralsol in cocoa trees in the region of Divo English Abstract Fertilization is important for sustainable cocoa trees replantation in the context of climate change. A two-year study was conducted at the National Center for Agronomic Research (CNRA) Cocoa Research Station in Divo to study the effects of organophosphate fertilization on fertility and soil fertility vertical microvariability of the organic matter, the adsorbent complex and some chemical equilibria on ferralsol in cocoa trees replantation. The experimental design was a Fisher block with 4 replicates with 6 treatments: T 0 (control), T 1 (5 t.ha -1 compost), T 2 (5t.ha -1 compost + 184 kg.ha -1 P 2 O 5 ), T 3 (5t.ha -1 compost + 122.6 kg.ha -1 ) P 2 O 5 ), T 4 (5t.ha -1 compost + 92 kg.ha -1 P 2 O 5 ) and T 5 (184 kg.ha -1 P 2 O 5 ). The vertical dynamics of the adsorbent complex, organic matter and some chemical equilibria in cocoa soils have been evaluated by changes in these parameters as a function of treatments and horizons. The results obtained showed that mixed fertilization (organic and mineral) was better than organic amendment or mineral fertilization exclusive to the complex, organic matter and chemical equilibrium. T2, T3, T4 and T1 treatments improved the characteristics studied. However, T2 treatment was better for improving the characteristics studied compared to other treatments (T1, T3, T4). Organic matter while mineralizing also allowed the accumulation of nutrients at the surface especially for mixed fertilization regimes, pool of root absorption in cocoa trees. This study showed that the phosphate nutrition of replanted cocoa trees can be adequately ensured with organophosphate fertilization based on compost and a low dose of TSP. These results could be used by cocoa farmers for successful replanting that is sustainable, environmentally friendly. © 2018 International Formulae Group. All rights reserved. Keywords: Vertical dynamics, redistribution rate, organo-mineral fertilization, husk cocoa pod residues compost

international journal of biological and chemical sciences

Effets de la fertilisation organo-phosphatée sur la fertilité en matière organique et complexe adsorbant d’un ferralsol sous cacaoyers dans la région de Divo (Côte d’Ivoire)