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Abstract
The effect of different levels of irrigation on lucerne production on light soils was investigated using as treatments unirrigated and irrigated below wilting point and at 90% and 60% available moisture depletion. The mean results over 2 years showed that irrigation of the below-wilting-point treatment gave the greatest response; four irrigations more than doubled production compared with unirrigated. Irrigation at 90% and 60% available moisture depletion increased production 2.4 and 2.5 times, respectively, compared with unirrigated, which required an average of 6.5 and 11.5 irrigations. The form of the relationship between water used and production showed increasing amounts of water are needed to produce each successive unit of production.