Nitrogen fixation occurs in nature either due to lightning or nitrogen-fixing bacteria. Importance: Nitrogen-fixing bacteria are very important because they provide the plant with nitrogen and fertilize it. Nitrogen is so vital because it is a major component of chlorophyll, the compound by which plants use sunlight energy to produce sugars from water and carbon dioxide (i.e., photosynthesis). It is also a major component of amino acids, the building blocks of proteins. Phosphate solubilizing bacteria (PSB) are beneficial bacteria capable of solubilizing inorganic phosphorus from insoluble compounds. Importance: Most of the phosphate fertilizers are not utilized completely by the plant. They get fixed in the soil and are never available to the plants. These Bacteria helps them to get dissolved and thus utilized by the plants. Helps is reducing the fixed phosphorus and reduced use of phosphate fertilizers. Potash is one of the major nutrient for the crop without which the plants are not able to complete its lifecycle. It is available in the soil in various unavailable form. Potash mobilizing bacteria convert these unavailable form to the available form and transports it to the root zone of the plant. Importance: Improves fertility in all types of soil. Reduces the usage of chemical fertilizer. It thrives in the soil for a long time. It also reduces the leaching of potash in the soil subsurface.