Resumo

VALLES-ARAGON, María Cecilia et al. QUALITY OF IRRIGATION WATER IN A WALNUT AREA OF CHIHUAHUA STATE. Rev. Int. Contam. Ambient [online]. 2017, vol.33, n.1, pp.85-97. ISSN 0188-4999.  https://doi.org/10.20937/rica.2017.33.01.08.

Cultivation of pecan nuts is very important for the economic impact in the northern region of Mexico. The application of water in the orchards from agricultural wells with high salt content, promotes their accumulation in the soil, hindering their mobility to tree roots. In order to chemically analyze the composition of water irrigation in the pecan-producing region of southern Chihuahua and contrast it with the current Mexican standards, the following research was conducted. Sampling was carried out in June 25, 2014. Ten orchards in the south of the Chihuahua State were selected and a water sample from each well was taken. The analyzed parameters were pH, chlorides, Fe, Mn, Zn, Cu, As, B, Pb, Cd, Ni, Na, total dissolved solids, nitrates, hardness, alkalinity, sodium adsorption ratio and electric conductivity (EC). For human use and consumption was considered the Mexican official norm (NOM 127), and for agricultural irrigation the Federal Law of Rights - Provisions Applicable to Matters of National Waters. Values obtained in the south of the Chihuahua State were within the parameters established for both drinking and agricultural irrigation water, thus being this water of good quality. However, it is suggested to have a periodic monitoring of the concentrations of Pb, Ni, As, B and CE to avoid the future possibility of repercussions to the human population of the surrounding communities in the region and of negative impacts on farming activity.

Palavras-chave : Carya illinoinensis; metalles; pH; nitrates; water quality.

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