Our research studies aimed at improving on-farm irrigation efficiency, plant water use efficiency and indeed water productivity. This is done by using several approaches: 1) Reducing the consumptive plant water use using deficit irrigation, partial root-zone drying and canopy management techniques, 2) Improving the harvest index by using regulated deficit irrigation, root-pruning and dwarfing rootstocks, 3) Reducing irrigation water lost by deep percolation by determining, on-site, the plant wat