Show gypsum considered as a direct soil fertilizer gypsum according to iowa tests does not lime lie hie ability to neutral ile held soils even though hough it does con fain calcium the same finine as limestone it hns has no alkalinity and therefore cannot take the place pince of limestone on oil the other hand gyp primi des not lime have nin any injurious effect on tile lie soil us its Is bell believed eved the iowa ion million till ion says should bo be con coil a ni a direct fertilizer us as it supplies piles anti and sulphur to plants it also has some value hlll in certain soils as nn an indirect fertilizer fur fo r laboratory experiments have shown that it hus has the property of native potassium available aval lable to plants und hence might in some soine cases tithe tl the lie place of expensive po the tit bulletin cov cring tills work aik oik ma ingy be had find by writ trig luff for no 23 bulletin section lowi lowa state college allies aines iowa |