Resumo

LOERA-ALVARADO, Luz Andrea et al. Runoff water quality for agricultural use captured on earthen dams. Ecosistemas y recur. agropecuarios [online]. 2019, vol.6, n.17, pp.283-295. ISSN 2007-901X.  https://doi.org/10.19136/era.a6n17.1867.

In arid and semi-arid areas, water is one of the critical factors for agricultural and livestock productivity. The shortage of the resource and the depletion of aquifers are specific problems of these regions where the collection of rainwater becomes essential, however, there is not information about its quality. Therefore the objective was to determine the quality and suitability of rainwater collected on earthen dams (ED) for use in agricultural irrigation. Water samples were collected from ED located in three micro-regions of the State of San Luis Potosí, where pH, EC (dS m-1), anions and cations were determined. In addition, Sodium adsorption ratio (SAR), Residual sodium carbonate (RSC), Percentage of possible sodium (PPS), Permeability index (PI), Kelly index (KI), Hardness, SARaj, Total dissolved solids (TDS), Effective salinity (ES) and Potential salinity (PS) were estimated. With the exception of magnesium, there were not significant differences between the micro-regions (p > 0.05). According to the Wilcox classification, Riverside standards and values of PI, KI, TDS, ES y PS, the water of ED is classified as of good quality and is appropriate for irrigation with potential for the production of forage.

Palavras-chave : Chemical composition; forage crops; irrigation; reservoirs; salinity.

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