Wu [ 85 ] noted a decreasing trend in K content in lettuce as R:B ratios ranged from 100:0 to 60:40, whereas Liu [ 86 ] observed an initial increase followed by a decrease in K content as R:B ratios ranged from 3:1 to 1:3 with the highest content at 1:1 and the lowest at 3:1.
1
—
—