Date: 22/05/2013
Introduction:
To keep soils productive and reduce their climate change footprint, farmers in the USA are encouraged to graze sheep more readily, adopt no-till systems, rotate crops, and use less nitrogen fertiliser.
http://www.ars.usda.gov/is/AR/archive/mar13/soil0313.htm
(USDA Agricultural Research Service, 8/03/2013)
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