Abstract
Fundamental investigations on the riboflavin contents of rice kernels were made under different conditions of fertilizers at three locations in Miyagi Prefecture, using two varieties of rice plant-Norin No. 21 and No. 24.
As to the yield of rice, the effct of nitrogen was notable, but its effect was varied with the quality of soil. Phosphorus was seemed to brought greater effect in the biosynthesis of riboflavin than the other conditions. Therefore, it was assumed that phosphorus has an important roll in the biosynthesis of riboflavin, although its tendency was varied with the quality of soil.
In the case of clayey-loam, it was difficult to observe the difference among the effect of the varieties to the biosynthesis of riboflavin and of fertilizers, however, in the case of peat-soil, varietal difference was remarkable.
