Excerpt from Fertilizers: Where the Materials Come From Where to Get Them in the Cheapest Form, How to Compound Formulas, Etc;, Etc In felspar and mica we have the great natural store houses of potash; the former containing seventeen per cent, and the latter nine per cent. It has been estimated from tests on a small scale, that, in soils from granite taken to the depth of twenty inches, on an acre of land the potash from the felspar alone is over one million two hundred thousand pounds. What this means may be in ferred when we consider that it has been computed that two cubic feet of felspar contains sufficient potash to supply the wants of an acre of young oaks for five years. 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 preserve the state of such historical works.