Biodiversity Heritage Library
By "Welch, L. Fred, "
Nitrogen use and behavior in crop production / L. Fred Welch.
By: Welch, L. Fred,
Publication info: Urbana, Ill. :Agricultural Experiment Station, College of Agriculture, University of Illinois at Urbana-Champaign,1979.
Contributed by: University Library, University of Illinois Urbana Champaign