Some aspects of selenium relationships in soils and plants

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Abstract
The variation in the Se amounts in plants reflects differences in the texture of the soil in which plants are grown. In the La Roche‐Posay region of France, kaolinite soils produce crops with excessive Se. Leaching may contribute to Se accumulation in drainage water, raising Se concentrations in plants grown in soils low in available Se, such as sandy or chalky soils. Also, various plant species differ in their capacity to concentrate Se and other elements. For instance, Helminthia echioides accumulates Se at rates ranging from 2.05 to 7.9 ppm and shows positive correlations with P, Mn, Zn, Ni, Co and Cd. For Trifolium repens, values ranging from 2 to 32.5 ppm of Se are positively correlated with the levels of K, Co and Mo. Conversely, absorption of Se is inhibited by Fe, Al, Ni and As.