一、氮氮素是果树树体中蛋白质、酶类、核酸、叶绿素及维生素等的组成成分。氮素主要作用是促进果树营养生长、加速幼树成形、延迟树体衰老、提高光合作用效能、促进果实增大、改善品质和提高产量。果 First, nitrogen Nitrogen is a tree fruit body proteins, enzymes, nucleic acids, chlorophyll and vitamins and other components. The main role of nitrogen is to promote vegetative growth of fruit trees, accelerate sapling formation, delay tree senescence, improve photosynthetic efficiency, promote fruit enlargement, improve quality and increase yield. fruit