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Journal Article Sustaining Agricultural Yields Get access Donald L. Plucknett, Donald L. Plucknett Search for other works by this author on: Oxford Academic Google Scholar Nigel J. H. Smith Nigel J. H. Smith Search for other works by this author on: Oxford Academic Google Scholar BioScience, Volume 36, Issue 1, January 1986, Pages 40–45, https://doi.org/10.2307/1309796 Published: 01 January 1986
Donald L. Plucknett (Wed,) studied this question.