As already reported in the previous publications, it was found that protein content of lowland brown rice was increased by nitrogen top dressing after heading stage or upland culture. When cultivated broadly by those cultural conditions, it is supposed that Japanese lowland brown rice shows higher protein level. In order to know protein level of lowland non-glutinous brown rice produced recently at farmers field, 250 samples (grade No.1: 42 samples, grade No.2: 45 samples, grade No.3: 46 samples, grade No.4: 46 sarnples, grade No.5 : 44samples and off-grade 1st class: 27 samples) in 1968 and 97 samples (grade No.3) in 1969 were collected from all over the country and investigated. Among the samples of the same grade, the difference between minimum and maxium values was 33-54 per cent. The average protein contents on dry weight basis of grade No.1-No.5 and off-grade 1st class in 1968, and grade No.3 in 1969 were 8.57, 8.64, 8.64, 9.03, 9.0l and 9.50%, and 8.64%, respectively. The above results indicate that recent lowland nonglutinous brown rice is not higher protein level.
