Symptoms of molybdenum deficiency in crops: first appear in the leaves in the middle of the old leaves or stems, and gradually develop to the young leaves and growth points. The plants are short and grow slowly. The leaves have yellow or orange spots of different sizes. In serious cases, the leaf edges wither, the leaves twist into a cup, and the old leaves thicken, scorch and die. Leguminous crops have the largest demand for molybdenum, and cruciferous cauliflower and cabbage also have high demand for molybdenum. Molybdenum fertilizer also had a great effect on the quality of winter wheat.