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Objectif : Le niebe ( Vigna unguiculata (L.) Walp.) est une legumineuse dont les feuilles peuvent etre utilisees dans l'alimentation du betail. L'objectif de l'etude est d'apprecier l'evolution des teneurs en elements mineraux des feuilles de niebe au cours de son cycle de developpent et de deceler la meilleure periode de recolte de ce fourrage dans les conditions pedoclimatiques de la zone de Boundji. Methodologie et resultats : Les feuilles de niebe ont ete prelevees a 1, 2 et 3 mois apres le semis. Sechees a l'etuve a 60°C jusqu'a poids constant, elles ont subi des analyses chimiques au laboratoire. Les resultats obtenus montrent que les teneurs en divers elements mineraux evoluent differemment au cours du cycle de developpement de la plante. Conclusion et application des resultats : Dans l'ensemble, les teneurs en elements majeurs et en oligoelements peuvent couvrir les besoins de croissance, d'entretien, de reproduction et de production de lait des animaux durant les trois mois du cycle. Cependant la periode de 1 mois apres le semis semble la plus favorable a la recolte des feuilles. Mots cles : Niebe, cycle de developpement, fourrage, elements mineraux, zone de Boundji . Evolution of mineral contents of leaves of cowpea ( Vigna unguiculata (L.) Walp.) grown in the area Boundji Republic of Congo. Objective : Cowpea ( Vigna unguiculata (L.) Walp.) is a legume whose leaves can be used in cattle feed . The objective of the study was to assess changes in mineral contents of cowpea leaves during its growing cycle and to identify the best period of harvest in soil and climatic conditions of the Boundji area. Methodology and results : Cowpea leaves were collected at 1, 2 and 3 months after sowing. Dried in an oven at 60 ° C to constant weight, they were subjected to chemical analysis in the laboratory. The results show that the levels of various minerals behave differently during the development cycle of the plant. Conclusion and application of results : Overall, the levels of major elements and trace elements can cover the needs of growth, maintenance, reproduction and milk production of animals during three months of the cycle. However the period of one month after sowing seems most favorable to harvest the leaves. Keywords : Cowpea; development cycle; forage; mineral contents; Boundji area

journal of applied biosciences

Évolution des teneurs en éléments minéraux des feuilles de niébé (&lt;i&gt;Vigna unguiculata&lt;/i&gt; (L.) Walp.) cultivé dans la zone de Boundji en République du Congo