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Sudan Journal of Agricultural Research

Crop water requirements of irrigated grain sorghum in central Gezira

Abdelhadi A. W. and M. A. Elhadi

Abstract:

Field experiments were conducted for two seasons to determine the optimum crop water requirement (CWR), yield response factor, water use efficiency and crop coefficients for sorghum, variety Wad Ahmed. Three irrigation intervals were used: weekly (W1), at two weeks (W2) and at three weeks (W3). Actual evapotranspiration measured by intensive gravimetric soil sampling was 644, 573 and 527 mm/season for W1, W2 and W3 respectively. The average grain yield in the first season was 3.63, 3.13 and 3.00 t/ha for W1, W2 and W3 respectively. Weekly irrigation interval resulted in a significant increase in both grain and forage yield as compared to other irrigation intervals. The study showed that sorghum grain and fodder yield increased linearly as water use increased. Similar water use efficiency of 6 kg/ha /mm was obtained in all irrigation intervals. The variety Wad Ahmed is not sensitive to the water reduction as its ky is equal 0.9.




 

Sudan Journal of Agricultural Research Vol. 10  (2007) PP. 47-57