. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . Much mysterysurrounded its action in earlier times, which has been re-moved by modern discoveries in agricultural science. Itis now available as ground gypsum and as a by-productof the manufacture of double superphosphate. 463. The source of some of the gypsum in soils. — Incertain localities considerable calcium sulfate is present insoils naturally, and since the advent of superphosphates ithas been added in that form to the land in considerableq
. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . Much mysterysurrounded its action in earlier times, which has been re-moved by modern discoveries in agricultural science. Itis now available as ground gypsum and as a by-productof the manufacture of double superphosphate. 463. The source of some of the gypsum in soils. — Incertain localities considerable calcium sulfate is present insoils naturally, and since the advent of superphosphates ithas been added in that form to the land in considerablequantities, with but little thought on the part of the userthat it was present in the usual commercial fertilizerwhich he was applying. Gypsum has also been added to soils incidentally, insome cases, in kainit, which is used by itself or as a fre-quent constituent of ready mixed commercial fertilizers. The effect of gypsum and lime on clover and other plants.— In Europe, generally, gypsum has long been consideredas a specific for clover; and in many cases it has beenfound to give much better results than lime. Indeed, 309 310 FERTILIZERS. Storer l cites several suchcases and mentions in thesame connection that Gas-parin found it to work wellon a soil containing 20 percent and more of lime. In experiments at theagricultural experimentstation of the Rhode Is-land State College it wasfound, on an acid silt loamsoil, that, notwithstandinga striking gain in beets andclover resulting from theuse of gypsum, the employ-ment of the same quantityof calcium oxid in air-slaked lime gave far betterresults. In order to throw lightupon other similar discrep-ancies in the use of thesesubstances, it should bepointed out that Gasparinwas dealing with a soil wellsupplied with lime, in whichthe general conditions werenot unfavorable to thegrowth of the particularcrop concerned, whereas inthe experiment made in 1 Agriculture, etc.,(1897), 326. Vol. GYPSUM AND WASTE LIME FROM INDUSTRIES 311 Rhode
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfertili, bookyear1913
