Abstract

A field experiment was carried out to study  the effect of partial root zone irrigation on growth and yield of sorghum  (Sorghum bicolor L.)   in a gypsifereous Soil ,  at the experimental station of the college of Agriculture, Tikrit university, located at 34°40 49 and 43° 38 40 longitude and 129m above sea level . The experiment was conducted with a Randomized complete Block Pesign (RCBD). The Irrigation treatments Included  Conventional Irrigation, Fixed Partial Root-Zone Irrigation and Alternate Partial Root-Zone Irrigation (I₁  , I₂ , I₃). were applied during one of the four growth stages, which are the emergence phase, the vegetative phase, the flowering stage and seeds development (S₁  , S₂ , S₃ , S₄). Sorghum seeds (var. Inkath) were sown during the autumn season on 7/21/2019 and harvested on 11/20/2019 . The results showed that water consumption  of the sorghum was 754.3,629.0,609.7,706.3 and 694.3 mm.season ^-1 highest for full irrigation, prd irrigation in emergence , vegetative, the flowering  and seeds developmentstages respectively. I₃ S₂ treatment were highest,  0.94 kg m^-3 In comparison with anther all treatments  .Mean of full irrigation  were highest 1.43 m^-3 kg^-1 In comparison with anther all treatments.