Selenium in Swedish soils. Factors influencing soil content and plant uptake

absorption de substances nutritives analyse de sol clay soils cultivated land feed grasses forest soils grain granos nutrient uptake organic matter pastizales pastures ph sandy soils selenio selenium silty soils soil testing sol argileux sol limoneux sol sableux solubilidad solubility suecia suelo arcilloso suelo arenoso suelo forestal suelo limoso sweden tierras cultivadas triticum