Phosphate is also a component of DNA, so it is one of the building blocks of genes and chromosomes. Phosphorus is involved in seed germination and helps plants to use water efficiently. Phosphorus occurs in natural geological deposits. Deposits can be found in the U.S. and other parts of the world. To make the P in phosphate ore soluble and available for plants to use, the ore is combined with sulfuric acid and further processed to make many different kinds of phosphate fertilizers.
Potassium protects plants against stresses.
Potassium protects plants from cold winter temperatures and helps them to resist invasion by pests such as weeds and insects. Potassium stops wilting, helps roots stay in one place and assists in transferring food. Potassium is a regulator. It activates plant enzymes and ensures the plant uses water efficiently. Potassium is also responsible for making sure the food you buy is fresh.