Gypsum.—“Time and practice” have ascertained the circumstances under which gypsum should be applied. As a reason why, after repeated applications, it no longer benefits,Prof.Liebig says, “when we increase the crop of hay in a meadow by means of gypsum, we remove a greater quantity of potash with the hay, than can, under ordinary circumstances, be restored. Hence it happens that, after the lapse of several years, the crops of grass on lands manured with gypsum, diminish, owing to the deficiency of potash.” In such a case, if spent ashes were employed either in connection or alternately with gypsum—potash would be resupplied from the ashes.
Gypsum.—“Time and practice” have ascertained the circumstances under which gypsum should be applied. As a reason why, after repeated applications, it no longer benefits,Prof.Liebig says, “when we increase the crop of hay in a meadow by means of gypsum, we remove a greater quantity of potash with the hay, than can, under ordinary circumstances, be restored. Hence it happens that, after the lapse of several years, the crops of grass on lands manured with gypsum, diminish, owing to the deficiency of potash.” In such a case, if spent ashes were employed either in connection or alternately with gypsum—potash would be resupplied from the ashes.