Yield and water use efficiency of barley under different irrigation scheduling methods in southern Tunisia
In southern Tunisia,having less than 200 mm of annual precipitation,saline shallow ground water is used for irrigation.This study evaluated the effectiveness of the different irrigation scheduling methods and the automatic irrigation by comparing net income with a virtual water price.Barley was cultivated with drip irrigation.First treatment was “full irrigation(FI)in which amounts required to replenish the root zone to field capacity was applied when the estimated readily available water was depleted.Second and third treatments were 0.7 and 0.5 times of amount but the same timing as first one.Fourth was deficit irrigation but only during maturity stage(DIM50).Fifth was an automatic irrigation system which applied 20 mm water when the monitored water content reached below a threshold value.Sixth was simulated irrigation in which optimized amount of water was applied every 4 days using a numerical model,WASH_2D,that simulates water,solute,and heat transport and crop response in two dimensions.Results showed that automatic and simulated treatments attained higher yields but the total applied depths were also high.The other treatments which applied less depth gave lower yield and net income but water use efficiency(yield per unit irrigation depth)was higher than automatic and simulated irrigation treatments.The highest net income was obtained in automatic irrigation.On the other hand,the highest water use efficiency was obtained in DIM50.
Masayasu Okazaki Kamel Nagaz Haruyuki Fujimaki Fathia El-Mokh
Graduate School of Agriculture,Tottori University,Japan Institut des Régions Arides,Médenine,Tunisia Arid Land Research Center,Tottori University,Japan
国际会议
The 11th International Conference on Development of Drylands(第十一届国际干旱区大会)
北京
英文
381-397
2013-03-18（万方平台首次上网日期，不代表论文的发表时间）