. Principles of agricultural chemistry [microform] . ^ Air, freed fromoxygen by passing over heated metallic copper, is passed into amixture of calcium carbonate and carbon heated in the electricfurnace. The first product is probably calcium carbide:— 2CaC03 + 5C — 2CaC3 + is then converted by absorption of nitrogen into calciumcyanamid: CaC^ + 2N == CaCN, + product contains 15 to 25 per cent, nitrogen and is useddirectly as a fertilizer. A cheap source of electrical energy isrequired. Circulation of Nitrogen.—The circulation of nitrogen is some-what more complicated than that
. Principles of agricultural chemistry [microform] . ^ Air, freed fromoxygen by passing over heated metallic copper, is passed into amixture of calcium carbonate and carbon heated in the electricfurnace. The first product is probably calcium carbide:— 2CaC03 + 5C — 2CaC3 + is then converted by absorption of nitrogen into calciumcyanamid: CaC^ + 2N == CaCN, + product contains 15 to 25 per cent, nitrogen and is useddirectly as a fertilizer. A cheap source of electrical energy isrequired. Circulation of Nitrogen.—The circulation of nitrogen is some-what more complicated than that of carbon. The diagram showsthe various processes which it undergoes.^ Bulletin 63, Bureau of Soils. 46 principle;s of agricultural chemistry Argon, which is found in the air, is a gas related to nitrogenand is apparently incapable of entering into chemical has no agricultural importance. Associated with argon in theair, in very small quantity, are the other gases of similar char-acter, namely, neon, helium, krypton, and Fig. 9.—Circulation of nitrogen. Ammonia.—The air contains about one part of ammonia infifty million. The column of air resting on an acre weighs about41,300 tons, which would contain about pounds air contains less ammonia than town air. The ammoniain the air probably comes from the decay of organic nitrogenousbodies, especially urine. The exhalations of volcanoes and THE PLANT AND THE ATMOSPHERE 4/ fumeroles also contain ammonia, which may be due to the actionof water on nitrides. Ammonia gas is absorbed by the foliage of plants, as has beenshown by experiments such as the following of Peters and Sachs.^The stem of a bean plant was cemented under a bell jar. Theleaves and foliage were within the jar, while the roots and soilwere outside. The plant was supplied through tubes with airmixed with 4-5 per cent, carbon dioxide. Another plant in asimilar apparatus was supplied with the same gases, but theywere pass
Size: 1561px × 1601px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidprinciplesof, bookyear1913
