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Excerpt from Soil Changes Resulting From Nitrogenous Fertilization: A Lysimeter Study Merkle (24) (1934) made base exchange studies on the Jordan plots at the end of 50 years. Sulfate of ammonia reduced the exchangeable calcium, magnesium and potassium to a marked degree. However, the heaviest application (72 lbs. Of nitrogen twice in each five-year rotation) did not cause a significant depletion of these bases as compared with the intermediate application (48 It seems logical that the more calcium that is present in the soil, the more rapidly it will be removed, and that, when the active content is reduced to a very low figure, the nitric and sulfuric acid may leach through as acids or even as iron or alumina salts. During the 12-year period from 1915 to 1927, the loss of calcium and magnesium has been no greater on the sulfate of ammonia plot 32 than on the phosphorus-potash plot 25. This is because early in the experiment the sulfate of ammonia has replaced the readily ra placeable calcium with hydrogen ions. In the above studies sodium nitrate was found to have no Significant effect on the exchangeable bases, even at the highest rate of application. There was an apparent decrease in total base exchange capacity, as compared to nearby PK plots; on the basis of 1931 samples. Since this did not appear in the 1927 data, it is probably not Significant. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to pr