Availability and accumulation of heavy metals in meadow sward against the background of very acid soil selected properties

crop yield facteur de rendement factores de rendimiento gramineas graminee grasses grassland soils heavy metals herbaceous plants meadows metales pesados ph del suelo ph du sol plant response plant soil relations prados de siega prairie de fauche relaciones planta suelo relation plante sol rendement des cultures rendimiento de cultivos respuesta de la planta soil ph sol d'herbages suelo de praderas yield factors