Potassium is a mineral nutrient essential to both plants and animals. For example, it is the third most abundant mineral in our bodies, surpassed only by calcium and phosphorus. More than 85 percent of K in the human body is found in major organs such as muscles, skin, blood and the digestive tract. Neither animals nor plants can survive without adequate supplies of K…its effects are real. Plants require more K than any other nutrient except nitrogen. Agronomic crops contain about the same amounts of N and K, but K content of many high-yielding crops is even higher than that of N. Unlike other nutrients, K does not form compounds in plants, but remains free to ‘regulate’ many essential processes…including enzyme activation, photosynthesis, water use efficiency, starch formation and protein synthesis.