Beside light, temperature, mechanical support, water, air there are certain elements which are essential for the normal growth of plants. These elements are sixteen in numbers. Some of them are drawn by the plants from air and water and others are absorbed from the soil. Hence soil is the store house for the supply of their nutrients. Therefore, management of soil either by replenishing nutrients by external sources or through proper crop management practices in necessary. This has become still more important these days as the need of food, fodder, fibre and other crop is increasing with mounting pressure of population. Under such circumstances, intensive cultivation is the only way out. This leads to more utilization of nutrients. The problem is more serious with Nitrogen than with other nutrients. Additional recruitment of nutrients is supplied to the soil through fertilizers and manures.