Introduction to modern inorganic chemistry Book PDF, ePub eBook

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Book Descriptions:
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ... by the soil, and there rendered available for plant food by the action of symbiotic bacteria. Thus each nitrogen atom has doubtless undergone a never-ceasing cycle of changes through countless aeons of time. § 4. The Fixation of Atmospheric Nitrogen. The fertility of cultivated fields and gardens, as we have just seen, is dependent upon the amount of combined nitrogen added as manure or fertilizer. Of course, cultivated plants require fertilizers containing other elements, particularly phosphorus and potassium--but nitrogen is the most expensive. The development of agriculture is largely dependent upon the cheap production of available nitrogen. The consumption of sodium nitrate is so great that it has been predicted that the nitre beds of Chili and Peru will be exhausted in less than a century. Most of the sodium nitrate is employed as a fertilizer for wheat, etc. Since the comparatively small store available promises soon to be deplenished, it is obviously necessary to exploit other means of supplying farmers with the fertilizers they require. The nitre plantations do not give a large enough yield. F. Noble and L. Hiltner, in 1896, sold cultures of the "nitrogen-fixing" bacteria under the name nitragen for inoculating the soil. The results have not been altogether satisfactory. There are at present three promising methods for the conversion, or " fixation " of atmospheric nitrogen in a form available for plant food. (1) By heating calcium carbide in dry nitrogen, whereby it is converted into calcium cyanamide (q.v.); (2) the direct synthesis of ammonia from its elements (q.v.); and (3) the direct oxidation of atmospheric nitrogen and absorption of the resulting oxides in water or alkaline solutions. J. Priestley (1779) first noti...

Introduction to modern inorganic chemistry by Joseph William Mellor

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