Abstract

In rice cultivation, the general trend appears to be the application of more fertilizers, particularly nitrogenous, with the object. of obtaining higher yields. Dastur and Malkani (1933) recorded that in certain rice varieties ammoniacal N decreased and nitrate N increased with the aging of crop and the indica varieties absorb more N than the japonica types. Ishizuka and Tanaka (1950) using N levels ranging from 0 to 200 ppm, observed increasing concentration of total N up to 60 ppm in the grains beyond which there was no change in the content of total N. In indica varieties, due to accumulation of more soluble N, the N metabolism itself gets disturbed at higher levels of N. A remarkable increase in total N content was noticed in rice by increasing N supply (Tanaka et al. 1964 and Murayama, 1965).

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