Azospirillum is a nitrogen-fixing biofertilizer that colonizes the root zone and supports plant growth by making atmospheric nitrogen more available to crops. It is also known to produce growth-promoting substances that can improve root development, vegetative growth, and nutrient uptake. It can help reduce part of the nitrogen fertilizer requirement when used properly in an integrated nutrient program. It is widely used in cereals, millets, maize, wheat, sorghum, sugarcane, vegetables, and several other crops. Farmers value it because stronger roots often translate into better water uptake and improved crop vigor under stress. Its main agronomic role is to support nitrogen economy and root-zone performance.