[The effect of manure and mineral fertilizers applied in crop rotation on productivity of corn hybrids, their removal of nitrogen, phosphorus and potassium on carbonate chernozem]

absorption de substances nutritives application rates azote chernozem chernozems crop yield dose d'application engrais npk farmyard manure fertilizantes npk fosforo hybride hybrids nitrogen npk fertilizers nutrient uptake phosphore phosphorus potasio potassium rendement des cultures rendimiento de cultivos zea mays