As an important micronutrient for all plants, zinc plays a key role in the structural or functional of some enzymes and proteins. Zinc homeostasis in plants is the material basis to ensure the normal growth of plants. The proper growth of apple tree is based on the effective distribution of mineral elements and carbon nutrition in organs. Several studies demonstrated that zinc accumulation in different organs and different stages can be influenced by zinc deficiency. Organic acids(OAs) have chelate ability,...