Effect of Nitrogen Topdressing on B-vitamin Content of Rice Grain

Abstract

Investigations have been carried out to determine the effect of nitrogcn topdressing at panicle formation stage and full heading stage on the thiamine, riboflavin, nicotinic acid, pantothenic acid, biotin and fblic acid content of brown rice and milled rice of two varieties. As to the brown rice, both the topdressings had a significant effect on the decrease of the riboflavin content and the increase of the nicotinic acid content. There was, however, no significant effect of the topdressings on the B-vitamin content of the milled rice. On the other hand, the riboflavin, nicotinic acid and biotin content of the brown rice and the pantothenic acid content of the milled rice differed significantly between both the varieties