Download Enriching the Earth: Fritz Haber, Carl Bosch, and the by Vaclav Smil PDF

By Vaclav Smil

The commercial synthesis of ammonia from nitrogen and hydrogen has been of larger primary value to the fashionable international than the discovery of the aircraft, nuclear power, house flight, or tv. the growth of the world's inhabitants from 1.6 billion humans in 1900 to state-of-the-art six billion shouldn't have been attainable with out the synthesis of ammonia.

In Enriching the Earth, Vaclav Smil starts with a dialogue of nitrogen's precise prestige within the biosphere, its function in crop creation, and standard technique of offering the nutrient. He then seems at numerous makes an attempt to extend average nitrogen flows via mineral and artificial fertilizers. The center of the booklet is an in depth narrative of the invention of ammonia synthesis by way of Fritz Haber -- a discovery scientists had looked for over 100 years -- and its commercialization through Carl Bosch and the chemical corporation BASF. Smil additionally examines the emergence of the large-scale nitrogen fertilizer and analyzes the level of world dependence at the Haber-Bosch approach and its biospheric outcomes. ultimately, it appears to be like on the function of nitrogen in civilization and, in a tragic coda, describes the lives of Fritz Haber and Carl Bosch after the invention of ammonia synthesis.

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Extra info for Enriching the Earth: Fritz Haber, Carl Bosch, and the Transformation of World Food Production

Example text

This reaction is of great importance for all crops because nitrates are much more soluble than ammonia is, and plant roots can absorb them more readily from solutions in soil. 59 All of the ammonia in sewage trickling through a tube filled with sand and chalk was converted to nitrate in a few days. Addition of chloroform to the liquid terminated the process by killing all microbes, but recharging of the tube with a small lump of fresh soil restarted the conversion. But identifying the bacteria responsible for the oxidation proved elusive as long as the researchers used organic media.

The mean was lowered even in the best farming areas by the necessity of growing nonfood (above all fiber) crops, and on regional and national scales it was much reduced by climatic imperatives, above all by the limits on multicropping and by inadequate water supply. 63 Limits to Recycling and Legume Cultivation Recycling rates were obviously limited by the availability of suitable biomass. As already noted, even relatively nitrogen-poor crop residues were often unavailable for recycling. 66 High labor demands for gathering and distributing (and often also composting) large volumes of low-quality wastes precluded intensive applications on low-value crops or on more distant fields.

Nitrogen content of human wastes also varies considerably with the quality of average diets, but appreciable amounts of the nutrient were returned to soils in fermented urine and excrements in many traditional societies that did not proscribe handling of these wastes: after all, adults excrete 75–90% of the nitrogen’s daily intake in urine. 2 L of urine. 27 In traditional Chinese farming 70–80% of all human waste were recycled; huge volumes of night soil were brought from cities and towns, creating a large wastehandling and transportation industry (fig.

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