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WO field experiments were carried out under sprinkler irrigation system at the agricultural research station (ARC), Ismailia Governorate, Egypt in two successive summer seasons (2009 and 2010) to study the combination effects of irrigation regimes and N&Khumate rates on some soil properties, yield quantity, yield components, oil yield, crop water requirements as well as nitrogen use efficiency (NUE) and water use efficiency (WUE) of sunflower crop in sandy soil. A splitplot design with four replications was used. Two irrigation regimes (25% from the available soil moisture depletion (ASMD) and 50% ASMD) and four levels of N&K-humate combined (F0: control treatment, F1: 15 kg N + 2.0 kg k-humate /fed, F2: 30 kg N + 4.0 kg k-humate /fed, F3: 45 kg N + 6.0 kg k-humate /fed). The results indicated that the application rates of N&K-humate fertilizers and irrigation scheduling treatments significantly affected soil hydrophysics properties, yield and yield components. Therefore, an increase in total porosity (TP), field capacity (FC) and wilting point (WP), meanwhile, small decreased in soil bulk density and hydraulic conductivity were obtained. The average values of actual evapotranspiration (ETa) were 383.6, 362.6, 352.3 and 330.2 mm, for 25% ASMD irrigation treatments, respectively. Meanwhile those were 321.6, 310.2, 301.4 and 295.9 mm for 50% ASMD irrigation treatments, respectively. Also the chosen treatments were affected on seed yield and yield components. The highest averages of plant height, head diameter, head weight, seed weight/head and 100 seed weight, seeds yield/fed and seed oil/fed, in the two seasons were obtained from the highest application level of N&K-humate fertilizers and under the irrigation regime of 25% ASMD. The highest value of WUE was obtained under the highest level of N&K-humate (F3) and at 25% ASMD irrigation treatment. On the other hand, the highest value of NUE was obtained under the lowest level of N&K-humate (F1) and at 25% ASMD irrigation treatment.

Combination Impacts of Irrigation Regimes and N&K-Humate Rates on Sunflower Productivity and Water Use Efficiency in Sandy Soil