PGAL molecules are the initial building blocks for the other sugars, and for more complex molecules. Phosphorous also plays a role in disease resistance and helping plant tissues mature. It is also incorporated into the complex DNA structure of plants. In early growth stages of a plant, phosphorous is especially important to root growth. Phosphorous deficiency results in retarded growth throughout the plant, but is especially noted in the roots.
Potassium is involved in cell metabolism, protein synthesis, and water use.
Both phosphorous and potassium are key to inducing flowering. Phosphorous, is especially important in the development of the reproductive organs. Potassium contributes to vigor and color, and seed formation. Micronutrients Micronutrients, or trace elements, are used in very small quantities. Generally, enough of these minerals already exist in our soils, or come to our gardens through organic materials added as mulches.