. The chemistry of agriculture, for students and farmers. Agricultural chemistry. 214 NITROGENOUS FERTILIZERS In nitrifying, the ammonia is changed to nitric acid, and sulphuric acid is set free. Both acids require bases to neutrahze them, and thus there is twice as much hme or other base needed for this fertihzer as is needed for other nitrog- enous materials undergoing nitrification. Lime is used up very rapidly and acidity results (Section 186). III. NITROGEN AS AMINE OR PROTEIN 160. Cyanamid or Lime Nitrogen.—The utilization of atmospheric nitrogen in the manufacture of fertilizers is succ
. The chemistry of agriculture, for students and farmers. Agricultural chemistry. 214 NITROGENOUS FERTILIZERS In nitrifying, the ammonia is changed to nitric acid, and sulphuric acid is set free. Both acids require bases to neutrahze them, and thus there is twice as much hme or other base needed for this fertihzer as is needed for other nitrog- enous materials undergoing nitrification. Lime is used up very rapidly and acidity results (Section 186). III. NITROGEN AS AMINE OR PROTEIN 160. Cyanamid or Lime Nitrogen.—The utilization of atmospheric nitrogen in the manufacture of fertilizers is successfully accomplished in another way than by making calcium nitrate. The process depends on the fact that nitro- gen unites with calcium carbide to form calcium cyanamide at a temperature of about 1000° C. In the soil this com-. FiG. 51.—Plant of American Cyanamid Co., Niagara Falls, N. Y. pound changes gradually to nitrate. This fertilizer goes under a variety of names. Cyanamid is the trade name of the American product manufactured at Niagara Falls (Fig. 51). Calcium cyanamide is a common name for it, although as a matter of fact the fertilizer contains only about 45 per cent, of this compound. Lime nitrogen is another name;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stoddart, Charles William, 1877-. Philadelphia, New York, Lea & Febiger
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