Potassium helps plants absorb carbon dioxide from the air. For potassium-based fertilizers are potassium chloride, potassium sulfate, 40% probability potassium salt, etc. Potassium is especially needed flowers, with a deficiency of potassium flowers are not formed or they are very small. With a lack of phosphorus and potassium from the edges of leaves turn yellow and begin to gradually fall, plant growth is strongly delayed. A characteristic feature of potassium deficiency - bright rim around the leaf surface. In addition, the shortage of potassium plants are easier to fungal diseases.