Micronutrients play an important role in plant development and health by promoting strong growth, higher yields, and maximizing genetic potential. They can greatly impact root development, fruit setting, grain filling, seed viability, and plant vigor. This document discusses the role of micronutrients in various crops such as paddy, wheat, sugarcane, potato, vegetables, cotton, banana, and horticulture crops. It also notes that micronutrients indirectly benefit plants by feeding microorganisms in the soil.