Abstract

The presence of an adequate supply of available nitrogen in the soil is one of the most important factors relating to maintenance or improvement of soil fertility. The lack of sufficient nitrogen in soils, particularly those that have been cropped for many years has long been a limiting factor in crop production. Of all the nutrients, rice has responded to the maximum extent to nitrogen application in one from or other in all the rice growing tracts of the world. Green leaf, cattle manure and oilcakes are some of the important organic nitrogenous manures used for rice. But among the inorganic nitrogenous manures ammonium sulphate is the most commonly used fertilizer.

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