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Inter-seasonal trend (mean and standard error) of intrinsic water use efficiency (iWUE) of subsurface drip irrigated with 2.3 l/h (SDI 2.3 L) and 1.6 l/h (SDI 1.6) and rainfed (RD) carob trees, predicted with Random Forest. Letters indicate significant differences among the systems (p< 0.05).
