Abstract
Buffer-index values of the expressed saps of roots. tap roots and tubers were investigated. The species of plants used in this investigation are as follows : Sweet potato, Carrot, potato, Barley Wheat, Rice, Coix laeryma Jobi, Stone-leek, Houttuynia cordata, Spinach, Worms seed, Broad bean, G. silvaticum. From these results, it seems that there is no correlation between buffer-index values and pH toterance around pH 4.6-4.8,but the buffer-index values at pH 6.4-6.6 for alkalitolerance are higher than for acidtolerance in general. This subreport makes no claim to be complete, or widely based or conclusive; but there is enough to make a case for more general attention and more detailed examination of these phenomena.
