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Field trials were conducted at irrigation Research stations of the institute for Agricultural Research, Kadawa (11o 39'N, 08o 27'E 500 asl). The objective was to study the effect of irrigation regime (60, 75 and 90 % Available Soil Moisture (ASM) on the growth and yield of two recently introduced wheat cultivars (Siete cerros and Pavon 76). The result revealed that increase of irrigation regime from 60 to 90 % ASM did not significantly affect most of the growth, yield and yield parameters evaluated in the study. Each increased inirrigation regime however increased days to maturity, water use and thermal time but decreased water use efficiency. Pavon 76 produced superior grain yield than Siete ceros only in one season. Pavon 76 had a higher leaf area index (LAI), more tillers and spikes/m2 and larger grain size, but had shorter plants, lower grain weight and grain number/spike and matured earlier than Siete cerros. Irrigation level of 60 % ASM is recommended for both varieties in the Sudan savanna ecology. At this ASM the highest water use efficiencyof 4.0-4.8 kg/mm/ha was obtained and grain yield was not significantly compromised. Positive and highly significant correlations between grain yield and attribute such as number of spike/m2, grain weight/spike, plant height and harvest index were found. Des essais en champ ont ete conduits dans les stations de recherche de l'Institut pour la Recherche Agronomique a Kadawa (11o 39'N, 08o 27'E, 500 m). L'objectif etait d'etudier les effets de differents regimes d'irrigation (60-75-90 % de la reserve en eau utile du sol ou RU) sur la croissance et le rendement de 2 nouveaux cultivars de ble (Siete cerros et Pavon 76). Le resultat etait que l'augmentation de l'irrigation de 60 a 90 % de la RU du sol n'a pas significativement affecte la croissance, le rendement et les parametresdu rendement evalues dans l'etude. Chaque augmentation de l'irrigation a accru la duree de maturite, la consommation d'eau et la somme des temperatures, mais a diminue l'efficacite d'utilisation de l'eau. Pavon 76 a depasse Siete cerros en rendement seulement une fois. Pavon 76 avait un plus grand indice de surface foliaire, plus de talles et d'epis/m2 et de plus gros grains. Mais il avait aussi des plantes plus courtes, un moindre poids de mille grains, un faible nombre de grains/epis, ainsi qu'une maturite plusprecoce que Siete cerros. L'irrigation a 60 % de la RU est recommendee pour les 2 varietes en zone soudano sahelienne. Pour ce regime, la plus forte efficacite d'utilisation de l'eau est atteinte avec un niveau de 4 a 4,8 kg/mm/ha, sans compromettre le rendement en grains. L'etude a egalement montre des correlations positives tres significatives entre le rendement en grain et ses composantes telles que le nombre d'epis/m2, le pois de grains / epis, la hauteur de plante et l'indice de recolte. Keywords : Available soil moisture, moisture stress, wheat cultivars, yield, Nigeria.reserve en eau utile du sol, stress hydrique, cultivars de ble, rendement, Nigeria. Agronomie Africaine Vol. 16 (1) 2004: pp. 45-58

Effect Of Irrigation Regime On Wheat (<i>Triticum Aestivum</i> L.) Growth And Yield In Semi-Arid Tropics