Mango (Mangiferaindica L.) has been grown since the beginning of the century in Baja California Sur, one of the most arid states of México. Since water is a very scarce resource in this area, the estimation of water consumption by popular crops becomes a relevant aspect of hydrological research. Actual (ETa) and potential (ETp) evapotranspiration of mango c.v. Kent were estimated in the Experimental Station of CIB, located 17 Km west La Paz city. Trees under study were three years old; irrigation frequency was 14 days and depth of applied water was 0.15 m, a common amount in the region. Estimates for ETp were carried out through two indirect methods (Blaney-Criddle and Penman equations), and ETa by a direct method (a diffusive porometer). Data were fitted according to the total leaf area (TLA). Estimates from the indirect methods were 31 and 25% respectively greater than those given by the porometer. Main results (ETa = 0.5 cm day-1, or 0.07 m H20/14 days) suggest that a 40 to 50% reduction in the applied water depth is feasible in the region.
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