Nutrients and Nonessential Elements in Soil after 11 Years of Wastewater Irrigation
| Autor: | B. F. Faria Pereira, Zhenli He, Peter J. Stoffella, Célia Regina Montes, Virupax C. Baligar, Adolpho José Melfi |
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| Rok vydání: | 2012 |
| Předmět: |
chemistry.chemical_classification
Irrigation Agricultural Irrigation Time Factors Environmental Engineering Soil salinity Hydrogen-Ion Concentration Management Monitoring Policy and Law Waste Disposal Fluid Pollution Soil quality Soil Nutrient Agronomy chemistry Wastewater Metals Soil water Soil Pollutants Organic matter Leaching (agriculture) Waste Management and Disposal Water Science and Technology |
| Zdroj: | Journal of Environmental Quality. 41:920-927 |
| ISSN: | 0047-2425 |
| Popis: | Irrigation of citrus (Citrus aurantium L. × Citrus paradise Macf.) with urban reclaimed wastewater (RWW) can be economical and conserve fresh water. However, concerns remain regarding its deleterious effects on soil quality. We investigated the ionic speciation (ISP) of RWW and potential impacts of 11 yr of irrigation with RWW on soil quality, compared with well-water (WW) irrigation. Most of nutrients (∼53-99%) in RWW are free ionic species and readily available for plant uptake, such as: NH(4+), NO(3-), K(+), Ca(2+), Mg(2+), SO(4)(2-), H(3)BO(3), Cl(-), Fe(2+), Mn(2+), Zn(2+), Co(2+), and Ni(2+), whereas more than about 80% of Cu, Cr, Pb, and Al are complexed with CO(3-), OH(-), and/or organic matter. The RWW irrigation increased the availability and total concentrations of nutrients and nonessential elements, and soil salinity and sodicity by two to three times compared with WW-irrigated soils. Although RWW irrigation changed many soil parameters, no difference in citrus yield was observed. The risk of negative impacts from RWW irrigation on soil quality appears to be minimal because of: (i) adequate quality of RWW, according to USEPA limits; (ii) low concentrations of metals in soil after 11 yr of irrigation with RWW; and (iii) rapid leaching of salts in RWW-irrigated soil during the rainy season. |
| Databáze: | OpenAIRE |
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