Advances in Soil Science: Dryland Agriculture: Strategies - download pdf or read online

By J. F. Parr, B. A. Stewart, S. B. Hornick, R. P. Singh (auth.), R. P. Singh, J. F. Parr, B. A. Stewart (eds.)

ISBN-10: 1461389828

ISBN-13: 9781461389828

ISBN-10: 1461389844

ISBN-13: 9781461389842

From the start of agriculture till approximately 1950, elevated meals creation got here nearly fullyyt from increasing the cropland base. considering that 1950, even if, the yield in step with unit of land zone for significant vegetation has elevated dramatically. a lot of the rise in yields used to be as a result of elevated inputs of power. among 1950 and 1985, the farm tractor fleet quadrupled, global irrigated zone tripled, and use of fertilizer elevated ninefold. among 1950 and 1985, the complete power utilized in international agriculture elevated 6. nine occasions. Irrigation performed a very very important position within the swift bring up in nutrition creation among 1950 and 1985. The world's irrigated land in 1950 totaled ninety four million hectares yet elevated to a hundred and forty million by means of 1960, to 198 million by way of 1970, and to 271 million hectares in 1985. in spite of the fact that, the present price of enlargement has slowed to under 1 % in line with 12 months. the area inhabitants keeps to extend and agricultural construction via the yr 2000 must be 50 to 60% more than in 1980 to fulfill calls for. This endured call for for nutrition and fiber, coupled with the pointy decline within the progress price of irrigation improvement, implies that a lot of the extra agricultural creation in years to come needs to come from cultivated land that's not irrigated. Agricultural creation might be multiplied within the arid and semiarid areas simply because those areas make up tremendous parts in constructing international locations the place populations are quickly rising.

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Extra info for Advances in Soil Science: Dryland Agriculture: Strategies for Sustainability

Sample text

C. Environmental Quality . . . . . . . . . . . . . . . . . . VII. Insects, Plant Diseases, and Other Pests. . . . . . . . . . . . VIII. Soil Properties ............................................ A. Temperature. . . . . . . . . . . . . . . . . . . . . . B. Soil Aggregation. . . . . . . . . . . . . . . . . . . . C. Soil Density and Porosity. . . . . . . . . . . . . . . . . D.

B. Weed Control with Herbicides. . . . . . . . . . . . . . . C. Weed Control with Crop Rotations ......................... IV. Water Infiltration, Evaporation, and Conservation ............... A. Infiltration and Runoff . . . . . . . . . . . . . . . . . . B. Evaporation. . . . . . . . . . . . . . . . . . . . . . C. Water Conservation. . . . . . . . . . . . . . . . . . . V. Crop Growth, Yields, and Water Use. . . .

C. Environmental Quality . . . . . . . . . . . . . . . . . . VII. Insects, Plant Diseases, and Other Pests. . . . . . . . . . . . VIII. Soil Properties ............................................ A. Temperature. . . . . . . . . . . . . . . . . . . . . . B. Soil Aggregation. . . . . . . . . . . . . . . . . . . . C. Soil Density and Porosity. . . . . . . . . . . .

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Advances in Soil Science: Dryland Agriculture: Strategies for Sustainability by J. F. Parr, B. A. Stewart, S. B. Hornick, R. P. Singh (auth.), R. P. Singh, J. F. Parr, B. A. Stewart (eds.)


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