Brown, Lester R. "Struggling to Raise Cropland Productivity." In State of the World: 1998, eds. Lester Brown, Christopher Flavin, and Hilary French. New York: W.W. Norton and Company, 1998.

Gliessman, Stephen R. Agroecology: Ecological Processes in Sustainable Agriculture. Chelsea, MI: Ann Arbor Press, 1998.

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crop rotation alternating crops from year to year in a particular field legumes beans and other members of the Fabaceae family green manure crop planted to be plowed under, to nourish the soil, especially with nitrogen tilth soil structure characterized by open air spaces and high water storage capacity, due to high levels of organic matter monoculture a large stand of a single crop species

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