Manganese is an essential micronutrient for all higher plants, and it participates in multiple core physiological activities inside crops. First of all, manganese is an indispensable component in the photosystem of plant leaves. It takes charge of water photolysis during photosynthesis, supporting continuous chlorophyll production. Sufficient manganese supply keeps leaves green and vigorous. Secondly, manganese acts as an activator for dozens of key enzymes, which regulates nitrogen metabolism, carbohydrate transformation and antioxidant reactions in plant tissues. When manganese is deficient, crops will suffer from interveinal chlorosis, small brown speckles on young leaves, stunted new shoots and weakened growth. Applying EDTA-Mn can quickly supply available manganese, relieve deficiency symptoms, improve crop stress resistance against high temperature and drought, boost pollination and fruit setting, and help produce plumper grains and better-shaped fruits.