A field Study was conducted to evaluate the effect of six moisture regimes on agronomic characteristics of two cultivars of sorghum in two years. The experiment was carried out at the Kooshakak agricultural experimentaL station with a very heavy textured soil. The experimental design was a split plot with four replications. Moisture regimes were allocated to main plots, and the varieties, . pioneer 6 and pioneer 8 , to subplots. Different moisture regimes significantly affected timing of flowering, dry matter production, water use efficiency, forage yield and grain yield. The pioneer 8 cultivar was more suitable for grain production. Although a noticeable grain yield (3.6 tones per hectare ) was obtained by one irrigation at milk stage (13 treatment ) .more grain yield (5.8 tones per hectare ) was harvested with adequate irrigation until “phgsiological maturity” of sorghum (16). The pioneer 6 cultivar is recommended for forage production in soft dough stage (appropriate stage for silage ). In the shortage of irrigation water, this cultivar is recommended since , by making use of underground water, a noticeable forage yield (46 tons per hectare ) can be produced by irrigation throughout the vegetative growth. With adequate irrigaton throughout all development stages (16), a maximum forage yield (62 tons per hectare ) was harvested.
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