1. To classify hulless barley by quality, extraction ratios were tested. In this tests, the correlation between ratio and volume weights was considered chiefly. 2. Concerning extraction ratio, its significant differences were observed in the differences among inspection grade, but these differences were due to differences of volume weights, by grade comparing tests. By block comparing tests, significant differences of extraction ratio was noticed in the differences among blocks, but these differences were not due to differences of volume weights. In hulles barley, regression exists at different means and equal regression. 3. So we can adjust extraction ratio by straight line regression. By this adjusted extraction ratio, quality was classified. 4. In the next test to be done, increasing replication of tests in each lots must be considered.
