Root bioactivity of corn and sunflower as evaluated by 75Se-plant injection technique [Romania]

absorption de substances nutritives agricultural chemicals anatomia anatomie anatomy application methods balcanes balkans campanulatae cereales cereals chernozem chernozems compositae crops cultivos cultivos de grano dicotiledoneas dicotyledons economic plants elements engrais environment environnement europa europe feed crops feed grasses fertilizantes nitrogenados fertilizers fisiologia fonction physiologique genetic soil types glumiflorae grain crops gramineae gramineas graminee grasses helianthus helianthus annuus industrial crops medio ambiente methode methods monocarpos ornamentales monocotyledons nitrogen fertilizers nutrient uptake oil crops ornamental monocarps ornamental plants physiological functions physiologie physiology plant anatomy plantas plantas azucareras plantas feculentas plantas forrajeras plantas industriales plantas oleaginosas plantas ornamentales plante plante de culture plante industrielle plante ornementale plante ornementale monocarpique plants produit agrochimique racine root treatment roots selenio selenium semimetales semimetals site factors soil types starch crops storage organs sugar crops technique des traceurs tracer techniques traitement des racines type de sol zea mays