The use of furrow irrigated bed width method has increased due to its capability of saving massive amounts of irrigation water. Based on these field experiments were conducted to evaluate the impact of furrow irrigated bed width and flow rate on irrigation efficiency, wheat grain yield and crop water productivity under surface irrigation system. The experimental field was arranged factorial experiments in randomized complete block design with three replications. The result indicated that, effect of bed width of furrow and flow rate were highly significant (p0.01) on wheat grain yield, yield component, crop water productivity, application efficiency and distribution uniformity, but effect of bed width of furrow were no significant effect on grain per spike and Plant height. The result of interaction analysis showed that interaction between bed width of furrow and flow rate were significant (p0.05) affected by wheat grain yield, crop water productivity, application efficiency and distribution uniformity, but non-significant influencing wheat yield component. The mean maximum wheat grain yield, crop productivity, application efficiency were obtained with treatment interaction of BW 80cm X Qsub2/sub, were 6.87 tons/ha, 2.88 kg/msup3/sup, and 87.52%, respectively. The mean maximum distribution uniformity of 90.35% was obtained with treatment interaction of BW 80cm X Qsub3/sub. From economic analysis point of view the maximum net benefit of 189,820 ETB per hectare with 1.05 benefit cost ratio was obtained at optimum bed width (80cm) and flow rate (Qsub2/sub). At optimum bed width (80cm) and flow rate (Qsub2/sub), 1234 msup3/sup/ha amount of water was saved and this saved water was able to irrigate 0.5 ha and from this hectare, farmers able to get net return of 93,653.72 ETB. Therefore, it can be concluded that, application of 80cm bed width of furrow and flow rate of Qsub2/sub (2L/s) at Dambi Dima irrigation scheme was found to be the most efficient and also economically viable.
Genemo et al. (Thu,) studied this question.