果树一般需钙较多 ,一旦发生缺钙 ,体内代谢受阻 ,植株生长即受抑制。顶芽、侧芽、根尖等分生组织容易腐烂 ;幼叶卷曲畸形 ,呈缺刻状或从叶缘开始变黄坏死 ;果实生长发育不良 ,顶端易出现凹陷及黑褐色坏死。1　苹果树缺钙　根粗短弯曲 ,根尖回枯 ,地上部新梢生长受阻 ,叶片变小 Fruit trees generally require more calcium, in the event of calcium deficiency, the body’s metabolism is blocked, plant growth is inhibited. Top buds, lateral buds, root tips and other meristem perishable; young leaf curl deformity, was nick-shaped or yellowish necrosis from the leaf margin; fruit growth and development of poor, the top prone to depression and dark brown necrosis. 1 Apple tree calcium short stubby roots, apical dead, shoot growth on the shielded obstruction, leaves smaller