The phenomenon that corn bract leaves are too short to cover the ear may be caused by the influence of abnormal environmental conditions such as drought during the ear differentiation and development stage, which inhibits the growth and development of corn.

Corn baldness can be caused by high temperatures during corn heading, pollen fever, excessive rain, poor pollination, excessive planting density, zinc deficiency, boron deficiency, drought, and insufficient fertilizer and water. Spray potassium dihydrogen phosphate plus boron fertilizer during corn heading period to improve corn stress resistance.