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| Home » Publications » Papers » 2005 |
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V Congreso de Ciencias
Hortícolas, Porto 2005
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| Comparación de dos cultivos indicadores de la disponibilidad de metales pesados María J. Lema; Generosa González; Saleta G-Pimentel; Pablo Rodríguez Estación Fitopatolóxica do Areeiro , Subida a la Robleda s/n, E-36153 Pontevedra, España. saleta@efa-dip.org. |
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ABSTRACT: Comparison of two cultivars as indicators of heavy metal pollution Soil inputs of heavy metals from sewage sludge are usually controlled in total and extractable soil fractions and in vegetative tissue of some test cultures. In this work different doses of sewage sludge and broiler chicken manure were applied in two acidic soils in order to check bioaccumulation of some heavy metals by lettuce and barley. For every treatments there are significant differences between soils for copper, chromium and nickel but not for total zinc. Differences which appear on DTPA extractable Zn as well as in both lettuce and barley composition. Both cultures show differences among soils for different nutrients and metals. There are significant differences between lettuce and barley composition, being concentration of every nutrients higher in lettuce. Plant analysis reflects better than soil analysis potential toxicity of zinc, but early barley accumulation of copper and zinc in the soil of higher levels point out that this is a better indicator of its potential toxicity than lettuce. Vegetative tissue analysis provides additional information on the actual effects of heavy metals on other essential nutrients such us phosphorus, calcium, iron, manganese and thus allowing a close diagnosis of the problem and its correction Keywords:metals, sewage sludge, barley composition, lettuce composition |
