Rice the major food crop of half of the worlds population, requires large amount of mineral nutrients including C and N for their growth, development and production. Rice crops remove around 16-17 kg N for the production of each ton of paddy. Most of the rice soils of the world are deficient in N, so, fertilizer N applications are required to meet its demand. Generally, urea is applied as the N source for rice production. But the efficiency of added urea-N is very low, due to denitrification, NH3 volatilization and leaching. In addition to these, regular depletion of this inorganic fertilizer...