Effect of Decision Variables on Irrigation Performance Parameters Under Different Irrigation Systems

摘要

Furrow irrigation has low irrigation performances due to inescapable irrigation water loss through runoff and deep percolation. This study was conducted under small farmers to study combined influence of furrow irrigation flow rate and irrigation systems on irrigation performance parameters. The purposes of study were to evaluate outcome of furrow irrigation flow rate and irrigation systems on application efficiency, distribution efficiency, storage efficiency and deep percolation loss using field experiment. The field experiment had two factors of three furrow irrigation system (AFI, FFI & CFI) and four furrow irrigation inflow rate (Q1, Q2, Q3 & Q4). Field experimental plot was made in randomized complete block design with factorial arrangement of twelve treatment combinations and three replications. The collected field variables were management variables (irrigation performances) and site variables (soil type, soil moisture and furrow bed slope). The results show that, influence of furrow irrigation inflow rate and irrigation systems on irrigation performance parameters were highly significant (P0.01). However, no significant difference among irrigation systems were observed in case of distribution uniformity (Du) expect furrow inflow rate. Interaction effect of irrigation systems and furrow inflow rate on irrigation performance parameter such as Ea, Du and DP were significant (p0.05) expect storage efficiency. The highest values of distribution uniformity were 93.45% was observed under CFIQ4 treatment combination while the least value of distribution uniformity was 81.58% was observed under AFIQ1 treatment combination. The highest values of application efficiency 68.35% was observed under AFIQ4 treatment combination and the least value of application efficiency 53.60% was observed for CFIQ1 treatment combination. However, the highest values of deep percolation loss 46.60% was obtained under CFIQ1 treatment combination and the least value of deep percolation loss 31.65% was found under AFIQ4 treatment combination. It can be concluded that best result in improving application efficiency, distribution efficiency, and storage efficiency with the reduction of deep percolation loss were obtained under Alternative furrow irrigation with maximum non erosive furrow inflow rate.