Potassium $(K^+)$ is usually found in the growing regions of plant. It is one of the constituents of the protoplasm. In the scarcity of potassium, the normal edges of the leaves become yellowish, and the stem becomes somewhat thin. The plants take potassium from the soil in the form of potassium nitrate and potassium chloride.
The naturally occurring inorganic nutrient found in the soil and food that is necessary for the proper functioning of animal and plant bodies is defined as nutrition. Minerals are vital elements essential for the body.