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Advances in Soil Science
häftad,
2011,
Engelska,
ISBN 9781461389842
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 …
Advances in Soil Science
häftad,
2011,
Engelska,
ISBN 9781461291572
The world population in 1950 was 2. 5 billion and is more than 5 billion today. The agriculture community, however, has responded remarkably well to meeting the increased need for …
Advances in Soil Science
häftad,
2011,
Engelska,
ISBN 9781461291121
The world needs for food and fiber continue to increase. Population growth in the developing countries peaked at 2. 4 percent a year in 1965 and has fallen to about 2. I percent. …