Nutrient utilization in Quercus leucotrichophora and Pinus roxburghii seedlings at five soil fertility levels

absorption de substances nutritives azote crecimiento croissance disponibilidad de nutrientes fertilidad del suelo fosforo growth highlands himalaya inde india nitrogen nutrient availability nutrient uptake phosphore phosphorus pinus roxburghii plant soil relations plantule potasio potassium quercus relaciones planta suelo relation plante sol seedlings soil fertility