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Objectif: le present travail consiste a evaluer les effets des sols salins et calcaires sur la croissance, la nutrition minerale et les composantes agronomiques de cinq varietes de niebe ( Vigna unguiculata (L) Walp) var. Garoua PG, Mouola PG, Garoua GG, Mouola GG et Tsacre) dans trois zones agro-ecologiques du Cameroun. Methodologie et resultats: le dispositif experimental est un bloc completement randomise avec cinq repetitions. Les resultats obtenus revelent que la biomasse seche des feuilles des varietes Mouola PG a augmente significativement dans les sols calcaires de Bare comparativement aux sols temoins de Yagoua. Dans les sols salins de Kribi, elle baisse significativement chez les varietes Mouola PG, Garoua GG et Tsacre. Les rendements en graines augmentent significativement chez les varietes Garoua PG et Mouola GG dans les sols de Kribi d’une part et d’autre part chez la variete Mouola PG dans les sols de Bare. Les fortes concentrations en Na + des sols de Kribi ont entraine une baisse remarquable des concentrations en K + , Ca 2+ , Mg 2+ et N dans les feuilles des varietes Mouola PG, Garoua GG et Tsacre. Par contre, dans le sol de Bare riche en Ca 2+ , les concentrations en Na + , K + , Mg 2+ et P ont augmente nettement chez les differentes varietes. Conclusion et application des resultats: l’examen de l’ensemble des parametres etudies revele que la zone agro-ecologique a pluviometrie uni-modale aux sols salins serait propice a la culture des varietes Mouola GG et Garoua PG tandis que la variete Mouola PG pousserait mieux dans la zone agro-ecologique des hauts plateaux aux sols calcaires. Mots cles: Niebe, croissance, nutrition minerale, rendement, sol salin, sol calcaire English Title:  Effects of saline and calcareous soils on the growth, mineral nutrition and agronomic components of cowpea ( Vigna unguiculata (L) Walp) in three agro-ecological areas of Cameroon English Abstract Objective: the present work evaluates the effects of saline and calcareous soils on the growth, mineral nutrition and agronomic components of five varieties of cowpea ( Vigna unguiculata (L) Walp) var. Garoua PG, Mouola PG, Garoua GG, Mouola GG and Tsacre) in three agro-ecological areas of Cameroon. Methodology and results: the experimental setup is a completely randomized block with five repetitions. The results obtained show that the dry biomass of the leaves of the Mouola PG varieties increased significantly in the calcareous soils (Bare) compared to the control soils of Yagoua. In saline soils of Kribi, the dry biomass decreases significantly in leaves of Mouola PG, Garoua GG and Tsacre. In Kribi soils, seed yields increased significantly in the Garoua PG and Mouola GG varieties, while in Bare, the Mouola PG variety grew better. The high Na + concentration of Kribi soils resulted in a remarkable reduction of K + , Ca 2+ , Mg 2+ and N concentrations in the leaves of the varieties Mouola PG, Garoua GG and Tsacre. On the other hand, in the soils of Bare rich in Ca 2+ , the concentrations in Na + , K + , Mg 2+ and P increased markedly in the different varieties. Conclusion and application of results: Examination of all the studied parameters reveals that the agroecological zone with a modal rainfall with saline soil would be favorable for the cultivation of the varieties Mouola GG and Garoua PG while the variety Mouola PG would grow better in the ecological highlands plateau with calcareous soils. Keywords: Cowpea, growth, mineral nutrition, yield, saline soil, calcareous soil

journal of applied biosciences

Influence des sols salins et calcaires sur la croissance, la nutrition minérale et les composantes agronomiques du niébé (&lt;i&gt;Vigna unguiculata&lt;/i&gt; (L.) Walp.) dans trois zones agro écologiques du Cameroun