Micronutrient absorbed by foliage is

Micronutrient absorbed by foliage is Zinc.
Zinc is an important component of various enzymes that are responsible for driving many metabolic reactions in all crops. Growth and development would stop if specific enzymes were not present in plant tissue.
Spray the plant with kelp extract or a micro-nutrient foliar spray that contains zinc. Foliar sprays provide zinc for plants where it is needed most and the rate at which they recover is amazing.