Show Gypsum Considered as a Direct Soil Fertilizer Gyps Gypsum m according to Iowa tests does not have the ability to neutralize neutral neutral- ize acid soils solIs even eten though It does contain contain con con- tam tain calcium the same as limestone It has no alkalinity and therefore cannot take the place of limestone On the other hand gypsum does not have any Injurious effect on the soil solI as is sometimes believed the Iowa station says Gypsum should be considered con considered as as 88 a direct fertilizer as It supplies calcium and sulphur to plants It It also has some value in cert certain Jn soils as an indirect fertilizer for laboratory experiments have shown that it has the property of ot making native potassium available to plants and hence might in some cases take the place of ot expensive potassium potassium po po- fertilizers T The e bulletin covering cov coy ering this work may be had by wrItIng writing writ wrIt- ing for No bulletin section Iowa State college Ames Iowa |