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Temporal evolution of the Normalised Difference Vegetation Index [NDVI] (a), reference evapotranspiration [ET0] (c), Evaporative Stress Index [ESI] (e), available water fraction [AWF] (g) and rainfall (i) for an area cultivated with cactus. The five panels (b,d,f,h,j) show monthly results over each year for NDVI, ET0, ESI, AWF and rainfall during the experimental period, respectively. Data with error bars represent the mean ± SD (standard deviation).
