Nitrogen use and behavior in crop production
Bulletin (University of Illinois at Urbana-Champaign. Agricultural Experiment Station) 761
Bulletin (University of Illinois at Urbana-Champaign. Agricultural Experiment Station) 761.
Welch, L. Fred,
Urbana, Ill. :Agricultural Experiment Station, College of Agriculture, University of Illinois at Urbana-Champaign,1979.
NAL: 100 Il6S (1) No.761
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