[PDF.65sr] Advances in Soil Science: Dryland Agriculture: Strategies for Sustainability

Advances in Soil Science: Dryland Agriculture: Strategies for Sustainability

[PDF.ul39] Advances in Soil Science: Dryland Agriculture: Strategies for Sustainability

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 | #9632712 in Books |  1990-01-01 | Original language:English | PDF # 1 |  9.25 x.89 x6.10l,1.21 | File type: PDF | 373 pages

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From the beginning of agriculture until about 1950, increased food production came almost entirely from expanding the cropland base. Since 1950, however, the yield per unit of land area for major crops has increased dramatically. Much of the increase in yields was because of increased inputs of energy. Between 1950 and 1985, the farm tractor fleet quadrupled, world irrigated area tripled, and use of fertilizer increased ninefold. Between 1950 and 1985, the total energy u...

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