Many investigators have found that high-lime soils may often be deficient in available potassium. According to the present theory, the low availability of the potassium in such soils is probably due to the high concentrations of calcium salts. The "so-called" alkali soils of Iowa have been found to contain high concentrations of both calcium carbonate and calcium bicarbonate. Apparently the concentrations of these salts are so high that they tend to depress the availability of the potassium in the soil.
Proceedings of the Iowa Academy of Science
©1933 Iowa Academy of Science, Inc.
Dean, Hartzell C. and Smith, F. B.
"The Effects of Potash and Crop Residues on Available Potassium in Some Alkali Soils of Iowa,"
Proceedings of the Iowa Academy of Science, 40(1), 96-96.
Available at: https://scholarworks.uni.edu/pias/vol40/iss1/41