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Anagroforestry trial, using legume trees for fallow improvement, was conducted from 1990 to 1993 at the CNRA experimental Station of Oume, in the semi-deciduous forest zone of Cote d'Ivoire. The study aimed at characterizing changes in soil fertility induced by one-year old fallows (Acacia mangium, Acacia auriculaeformis and Chromolaena odorata) and to show the effects of these legumes on post-fallow crop yields. After field clearing and cultivation, yam (Dioscorea alata) yields were obtained from tubers. The results showed that one-year old fallows did not result in significant rise in soil chemical parameters, except for a slight increase in CEC under A. mangium. However, yields showed the superiority of A. mangium (8.83 t ha-1) and A. auriculaeformis (5.22 t ha-1) over Chromolaena odorata fallows (2.67 t ha-1). In spite of important potentials, the legume tree fallows required more time to improve soil fertility status. Un essai agroforestier d'amelioration de jachere par des legumineuses arborees a ete conduit de 1990 a 1993, a la station de recherche du CNRA a Oume, en zone de foret semi-decidue de Cote d'Ivoire. L'etude vise a caracteriser les modifications de la fertilite chimique des sols induites par differents types de jacheres a Acacia mangium, Acacia auriculiformis et Chromolaena odorata et a mettre en evidence leurs effets sur les rendements des cultures post-jacheres. Apres defrichement des jacheres, l'igname (Dioscorea alata) a ete utilisee comme culture test. Les rendements ont ete estimes sur les tubercules frais. Les resultatsmontrent que les jacheres d'un an n'ont pas significativement ameliore la fertilite des sols, hormis une legere elevation de la CEC sous Acacia mangium. Toutefois, les rendements ont montre la superiorite des jacheres a Acacia mangium (8,83 t ha-1) et a Acacia auriculaeformis (5,22 t ha-1) sur la jachere naturelle a Chromolaena odorata (2,67 t ha-1). En depit de leurs potentialites, les jacheres arborees a legumineuses necessitent davantage de temps pour ameliorer la fertilite du sol de facon significative.

agronomie africaine

Effets des jacheres a &lt;i&gt;Acacia mangium, auriculiformis&lt;/i&gt; et &lt;i&gt;Chromolaena odorata&lt;/i&gt; sur la fertilite du sol et les redements de l'igname (&lt;i&gt;Dioscorea SPP.) en zone forestiere de C&amp;#244te d'Ivoire