Differential utilization of nitrates by solanaceous species, crops (tomato and pepper) and weeds (black nightshade and thorn apple)

absorption absorption de substances nutritives capsicum capsicum annuum datura enzymic activity fleur floraison flores flowering flowers lycopersicon lycopersicon esculentum malezas mauvaise herbe nitrate nitrate reductase nitrates nitrato reductasa nitratos nutrient uptake nutrition des plantes plant competition plant nutrition solanaceae solanum solanum nigrum tomate tomatoes uses usos utilisation weeds