Dey, A.D.2007-11-121993-04-012007-11-121993http://hdl.handle.net/10625/10486ThesisThesis (M.A.), University of Guelph, 1993Text1 digital file (195 p. : ill.)Application/pdfenSOIL FERTILITYFERTILIZINGNITROGENPOTATOESBARLEYCROP YIELDONTARIOMATHEMATICAL MODELSFIELD RESEARCHRESEARCH RESULTSSoil nitrogen tests for barley and potato crops in OntarioThesis