Horticulture [Effects of different levels of nitrogen and phosphorus fertilizers on grapes; effect of mineral fertilizers on guava; effects of levels of gibberellic acid (GA) on growth of sour orange. Gezira, Sudan]

auxinas auxine auxins azote bigarade crecimiento croissance engrais experimentation experimentos experiments fertilizers feuille ga gibberelline growth hojas leaves naranja de sevilla nitrogen plantule psidium guajava seedlings seville oranges vitis vinifera