Role of Raised Bed Technique on Water Productivity and Wheat and under the conditions of irrigated agriculture in central Iraq

"A field experiment was conducted during the agricultural season of 2017-2018 in the site is located at 82"" 10' 33ᵒ North, and longitude 51"" 32' 44ᵒ , East at an altitude of 33m above sea level. In order to evaluate the productivity of irrigation water by method of cultivation on irrigated furrows, when growing crops of wheat. Two factors were experienced in the cultivation of wheat, The first factor is the method of cultivation of five treatments were used included: Treatment of the cultivation of wheat in basins (B), treatment of the cultivation of wheat on bed with 50 cm width (S1), 60cm (S2), 70cm (S3) and 80cm (S4), The second factor is irrigation levels depletion included: 40, 60 and 80% of available water coded as W1, W2 and W3, respectively,. The results were as follows: Actual water consumption values for basin and bed treatments reached 389, 384, 365, 369.20, 367and 341mm for treatment BW1, BW2, BW3,SW1, SW2 and SW3 respectively. Treatment of wheat crops on bed with 80 cm width gave the highest average field water use efficiency reached 6.84 kg m-3 while BW3 treatment gave lowest average field water use efficiency reached 1.47 kg m-3. The highest average crop water use efficiency were found in S4W1ٚ S4W2 reached 2.06 and 2.07 kg m-3, respectively, It was lowest value for crop water use efficiency at BW3 reached 1.06 kg m-3. The percentage increase in the average efficiency of crop water using for bed treatments 40.37, 57.80, 73.39 and 85.32% for treatments S1, S2, S3 and S4 respectively Compared with basin treatment (B).The highest average total grains yield for Treatment of wheat crops on bed with 80 cm width was 7253kg ha-1 , Irrigation levels also affected the total grains yield, irrigation treatment of depletion 40% gave highest average 6300 kg ha-1 , That did not differ significantly from the irrigation treatments of depletion 60% In which the total grain yield was reached 6228 kg ha-1 ,In the interference factors between the cultivation method and the irrigation levels, the interference factors excelled S4W1, S3W2 and S4W2 Without significant differences in the total yield average 7600,7310 and 7600 kg ha-1, Respectively"