Cd, Ni and Zn contents of oat grain as related to soil factors and precipitation
1990
Eriksson, J.E. | Andersson, A. (Sveriges Lantbruksuniv., Uppsala (Sweden). Inst. foer Markvetenskap) | Wenblad, A.
The Cd, Ni and Zn contents of oat grain were related to their respective contents in soil as well as to soil pH and precipitation levels. A total of 356 samples of oat grain and soil, collected from randomly distributed sites in Aelvsborg County, in southwest Sweden, was analysed. Contents of the heavy metals in grain grown on clayey and sandy soils increased with decreasing pH and increasing amounts of metal extractable from soils in boiling 2M HNO3. Although the organic soils showed the same trend, the results were uncertain since the number of samples analysed was small. Within pH-range 4.7 to 7.3 the increase in grain Cd content with decreasing pH was greater in sandy soils than in clayey soils. The contents of each heavy metal in grain showed significant positive correlations with the contents of each of the other heavy metals. Contents in grain, particularly of Cd, were related to precipitation levels. Grain grown in areas with low annual precipitation had lower heavy metal contents than grain grown in areas with higher precipitation levels. The mechanism by which precipitation influences uptake is not fully understood
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