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Show tt111 Fertilizers From Wastes. Industrial wastes furnished about 40 per cent of the potash, 8 per cent of the phosphoric acid, and 85 per cent of the nitrogen used In this country In 191(5, according to a recent United Stntes department of agriculture publication, pub-lication, "Fertilizers From Industrial Wastes." The potash was obtained from such wastes as tobacco stems, cottonseed hulls, hardwood ashes, wool washings, blast-furnace flue dust, cement flue dust and sugar residues; the phosphoric phos-phoric acid from bones, shells, fish scrap, basic slag and other materials; nnd Hie nitrogen from wastes In the manufacture of castor. Unseed nnd fish ' oils; from animal wastes, as blood, hair, horns, hoofs nnd hides; from leather and wool wastes, coke, and many other substances. |