Sustainability of Sorghum and Water Productivity under a Deficit Irrigation Strategy and a Surface Drip Irrigation System
Keywords:
deficit irrigation, sorghum, water productivity, harvest index, drip irrigationAbstract
A field experiment was conducted by planting sorghum in the spring season in AlJadriya / University of Baghdad / the experimental station of the College of Agricultural Engineering Sciences (Station F), located at latitude (33˚16ʹ 28ʺN), at longitude (44˚23ʹ25ʺE), and at an altitude of 34 meters above sea level. In a clay loam soil, to study the effect of full and deficit irrigation scheduling in improving the water management efficiency of the sorghum crop Class Enqaz. The experiment coefficients included six irrigation levels: Treatment of 100% full irrigation when 50% of the ready water is exhausted and compensation in terms of aggregate evaporation from the evaporation basin class A to be completed to the field capacity, from which the deficit irrigation treatments 80, 70, 60, 50, and 40% of the complete irrigation were applied. Using the Completely Random Block Design with three replications. The seeds of the sorghum crop Class Enqaz were planted on 13-3-2022 and the harvest on 15-7-2022. The results were as follows: The total seasonal water consumption varied between full irrigation and deficit irrigation, and the highest consumption reached 540.64 mm season-1 at the treatment of full irrigation 100% and then decreased to deficit irrigation coefficients 80, 70, 60, 50 and 40% to reach 455.68, 413.20, 370.72 and 285.76 mm season-1 respectively. 80 and 70% of irrigation treatments outperformed the highest average water productivity of 1.17 kg m-3 for the two treatments.
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