Resumo

ISEA, Daisy et al. Acumulación y lixiviación de metales macronutrientes en suelos irrigados con aguas residuales tratadas . INCI [online]. 2004, vol.29, n.12, pp.660-666. ISSN 0378-1844.

Metal accumulation and lixiviation, as well as salt levels, were determined in soils submitted to irrigation with treated residual water. Metal macro-nutrients such as K, Ca and Mg are required for plant development, growth and healthy fruit production. The presence of non-nutrient metals such as Na in treated residual water is a limiting factor in its use for agricultural purposes, since it could be bio-accumulated in the human consumption feeding chain, placing the health of consumers at risk. In order to evaluate the use of treated residual water in the mobility of these elements in the soil profile, a sampling process was established for treated residual water at soil levels of 15, 30, 45, 60, and 75cm, collecting samples weekly for 10 weeks. Metals were determined by atomic absorption spectrophotometry, and for Na and K measurement the atomic emission technique was used. The physical-chemical characteristics of the treated residual water were acceptable for use in agricultural applications, and the low salt contents in soil permits an adequate mobility of the studied metals, allowing their use for irrigation crops.

Palavras-chave : Agua Percolada; Agua Residual Tratada; Macronutrientes; Riego; Suelos.