Christenson, D. R., D. D. Warncke, M. L. Vitosh, L. W. Jacobs, and J. G. Dahl. 1992. Fertilizer recommendations for field crops in Michigan. MSU Extension Bulletin E-550A, Michigan State University, East Lansing, Michigan, USA.
Citable PDF link: https://lter.kbs.msu.edu/pub/3018
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