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Objectif : Decrire la diversite des tubercules de manioc en collection en Cote d’Ivoire. Methodologie et resultats : Quatre varietes ameliorees de manioc (91/02324, 91/02327, TME1, Yavo) et un temoin local Gloussi ont ete reparties au hasard dans cinq repetitions selon le dispositif des blocs de FISHER. Recoltes a 12 mois, les caracteres physico-morphologiques des tubercules ont ete decrits. Les analyses statistiques de ces caracteres ont indique une difference significative entre les varietes de manioc, excepte le caractere « pourriture des tubercules ». Les donnees morphologiques ont montre des differences significatives entre les varietes de manioc ; excepte le caractere « position des tubercules ». Toutes les varietes de manioc ont developpe leurs racines tubereuses horizontalement dans le sol. La resistance a la recolte des tubercules a presente une correlation statistiquement positive (r = 0,98) avec le nombre de tubercules par plant et negative (r = - 0,63) avec la texture de la surface externe des tubercules. Le poids frais individuel du tubercule a indique une correlation statistiquement positive avec le diametre (r = 0,83) et la longueur du tubercule (r = 0,72). Les rendements frais en tubercules des varietes ameliorees (91/02327, 91/02324, TME1 et Yavo) ont varie entre  19,3 et 26,8 t/ha. Cependant, la variete locale Gloussi a fourni un rendement de 11 t/ha inferieur a ceux des varietes ameliorees. Conclusion et application : L'emploi de varietes performantes selectionnees pourrait apporter des gains substantiels dans les rendements de manioc en culture traditionnelle. Mots cles : manioc, caracteres, varietes, rendements, Cote d’Ivoire Physico-morphological variability of the tuberous roots of cassava ( Manihot esculenta  CRANTZ) grown on ferralsol in forest area of West Africa Objective : To describe the diversity of the tuberous roots of cassava cultivars in Cote d’Ivoire. Methodology and results : Four improved varieties of cassava (91/02324, 91/02327, TME1, Yavo) and a local witness Gloussi were distributed at random in five repetitions according to blocks of Fisher. Harvested at 12 months, the physico-morphological characteristics of the tuberous roots were described. The statistical analyses of these characteristics indicated a significant difference between the varieties of cassava; but only the character « tuber rot » did not record any significant differences. The raised morphological data showed significant differences between the varieties of cassava; but the character « position of tubers » did not provide a variance. All varieties of cassava developed their tuberous roots horizontally in the soil. The cassava tuberous roots harvest resistance to diseases showed a positive correlation (r = 0.98) to the number of tubers per plant and negatively (r = - 0.63) to the tubers surface texture. The tuber individual fresh weight indicated a positive correlation to the diameter (r = 0.83) and to the tuber length (r = 0.72). The fresh yield of tuberous roots improved varieties (91/02327, 91/02324, TME1S and Yavo) varied between 19.3 and 26.8  /ha. However, the variety local Gloussi provided a yield of 11 t/ha inferior to those of improved varieties. Conclusion and application of findings : The use of selected high yielding varieties could  ring substantial gains in cassava yields in traditional farming. Key words : cassava, characters, varieties, yield, Cote d’Ivoire.

journal of applied biosciences

Variabilité physico-morphologique des racines tubéreuses de manioc (&lt;i&gt;Manihot esculenta&lt;/i&gt; CRANTZ) cultivées sur ferralsol en zone de forêt d’Afrique de l’Ouest