Abstract
The fact that protein content of wheat and barley is markediy influenced by the supply of nitrogen at later stags of their growth has been demonstrated by some investigators. The same trend seems to be probable for rice crop. So, I attempted to see to what extent the protein content of brown rice might be affected by the supply of nitrogen at later periods. Some of the preliminary experiments are reported in the following. Nine young plants, which were grown under the same condition, were planted in each pot June 13,1948 and cultured by nutrient solution. The nitrogen supply was stoped at two different periods : [table]Nitrogen determinations were made of samples at several periods of each set. The result of this investigation show that 300 mg. N per pot were absorbed by the plant after heading and 40% of this nitrogen were utilized for the increase of protein content in grains. The difference in the grain yield of the both sets, which were harvested at full mature, was not significant but the protein percentage of set (b) was 1.50% higher than set (a), corresponding to 5.90gr and 5.10gr are protein yield per pot respectively. As regards the quality of protein in brown rice the protein increase in set (b) run parallel with the increase of oryzenin, most common protein fraction in brown rice, the other fractions : albumin, globlin, prolamin and insoluble protein, remaining fairly constant.
