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To assess the suitability of Leguminous species in rice intercropping systems, physiological and morphological characteristics of Crotalaria juncea, Cajanus cajan, Mucuna pruriens var. cochinchinensis, Calopogonium mucunoides, Aeschynomene histrix and Stylosanthes hamata were determined in monoculture. C. cajan and S. hamatawere selected and intercropped with two upland rice cultivars (WAB56-50, WAB450-24-3-2-P18-HB syn. V4) with different competitive ability, at sowing dates ranging from 0 to 84 days after rice sowing (DARS). In monoculture, C. juncea and C. cajan produced nearly 9 ton dry matter ha-1, whereas the other species produced below half this amount.Total N in leaf materials varied between 25 kg and 70 kg ha-1. Based on relative growth rate of the leaves, the height increase rate and total biomass, C. juncea, C. cajan and M. pruriens were identified as potentially most competitive. In intercropping system, a logistic function was adequate to describe rice grain yield, final rice biomass and legume biomassat one week after rice harvest as a function of legume sowing dates. Differences in rice grain yield were significant (P Pour determiner les legumineuses appropriees dans les systemes d\'association avec le riz, des caracteristiques morphologiques et physiologiques de Crotalaria juncea, Cajanus cajan, Mucuna pruriens var. cochinchinensis, Calopogonium mucunoides, Aeschynomene histrix et Stylosanthes hamata ont ete determinees en monoculture. C. cajan et S. hamata ont ete selectionnees et semees en association avec deux varietes de riz de plateau (WAB56-50, WAB450-24-3-2-P18-HB syn. V4) de competitivite differente, a des dates de semis variant entre 0 et 84 jours apres le semis du riz (DARS). En monoculture, C. juncea et C. cajan ont produit pres de 9 tonnes de matieres seches ha- 1, tandis que les autres especes ont produit moins de la moitie de cette quantite. L\'azote (N) totale dans les feuilles,varie entre 25 kg ha-1 et 70 kg ha-1. Sur la base de la croissance relative des feuilles, du taux de croissance en hauteur et de la biomasse totale, C. juncea, C. cajan et M. pruriens ont ete identifiees comme potentiellement les plus competitives. En association, une fonction logistique etait adequate pour expliquer le rendement grain du riz, labiomasse totale du riz et la biomasse des legumineuses une semaine apres la recolte du riz en fonction des dates de semis des legumineuses. Les differences de rendement en grain du riz etaient significatives (P Keywords : competition, intercropping, nitrogen, Oryza, yield loss/competition, associations, azote, Oryza, perte de rendement Sciences & Nature Vol. 4 (2) 2007: pp. 205-216

Morpho – physiological characteristics of Cover crops for analysis of upland rice production in relay intercropping systems