regimesA drip-irrigation system (Super Typhoon®, Netafim Irrigationequipment & Drip systems, Israel) was installed with a distanceof 20 cm between emitters and a spacing of 50 cm between driplines on the soil surface mid way between Jerusalem artichokerows and fitted with a pressure valve and water meter to supplya uniform measured amount of water. Before transplanting, waterwas supplied uniformly to the experiment field to field capacity(FC) to a depth of 10 cm using the drip irrigation system for cropestablishment until 14 days after transplanting (DAT).Different water gradients were supplied by the line sourceprinkler to the crop at 14 DAT until harvest. The line-source sprinkler system provided three water gradients, which hereafter are referred to as W1 (100% ET), W2 (75% ET) and W3 (45% ET), respectively. The water gradients were dependent on the distances fromthe line source, which was installed at the center of the field. The water supplied to W1 was expected to be equivalent to the cropwater requirement (ET crop). Water supplied to W2 was estimatedas 75% of that supplied to W1, and water supplied to W3 was 45%of that supplied to W1.The amount of water applied was based on crop water requirements using the Doorenbos and Pruitt (1992) methodology along with water loss from surface evaporation as described by Singh and Russell (1981).