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- W146298327 abstract "Some of the factors influencing the uptake of heavy metals by plants are presented based on the literature and on original results. Heavy metal concentrations in plants grown on the same substrate may vary according to plant species, degree of contamination of the substrate and the metal considered. Concentrations in above ground plant parts or in leaves can vary up to 100-fold between species, but mostly between 4- and 20-fold. Heavy metal uptake may also differ with plant varieties, with concentrations usually varying between 1- and 4-fold, though cases of 20-fold and more have been known. Ambient temperature is shown to affect the uptake of Cd from contaminated soil into shoots and roots of Italian ryegrass, red clover and beans. Shoots of Italian ryegrass contained slightly more and roots considerably more Cd when grown at 11/17 °C (night/day) as compared to 18/24 °C. Red clover and beans contained more Cd in the shoots at warmer temperatures, but clover roots contained less and bean roots rather more Cd at warmer temperatures. The soluble Cd content of the soil (extractant 0.1 M NaNO3) did not differ between the temperature treatments. Application of fertilizer may enhance the uptake of some heavy metals by plants from contaminated and uncontaminated soil in pot experiments and in the field. The Cd concentration in pot-grown spinach shoots was 40 % lower when no macronutrients in the form of analytical grade reagents were applied. Zn concentration in shoots was not affected, although the soluble Zn content of the soil varied significantly. Plants influence the bioavailability of heavy metals by changing the pH of the rhizo-sphere as a result of nutrient uptake, proliferation of root exudates, and respiratory activity, and these characteristics can vary considerably with species. In line with this the soluble contents of Cd and Ni in the soil differed significantly between several plant species grown in pots, the maximum differences being 4-fold." @default.
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- W146298327 date "1993-01-01" @default.
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- W146298327 title "Contaminant Uptake by Plants" @default.
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- W146298327 doi "https://doi.org/10.1007/978-3-0348-7542-4_13" @default.
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