Nitrogen Use Efficiency, Nitrogen Fertilizers, NUE, Nitrogen and the Environment Nitrogen Fertilization Methods


Split Applications of Nitrogen
      Recommendations from Dr. George Rehm (University of Minnesota)
      Sidedress Thoughts, Dr. George Rehm (University of Minnesota)
      Split N in Winter Wheat (Washington State University)
      Split versus Preplant Application of Nitrogen for Corn (Gyles Randall, UM)
      Corn Production as Affected by Nitrogen Application Timing and Tillage
              (Vetsch and Randall, Agron J. 96:502-509)

Nitrogen Fertigation
 
Preplant Nitrogen
      IPNI comparisons (Scott Murrell)

      Data from Iowa below for preplant N
Iowa State Fertilizer N Response, EONR

Optimum yield versus optimum N rate, at 77 Iowa sites, $3.75 corn, $.33 AA, C/C Rotation. 

“In a surprising finding, these (nitrogen) experiments showed no relationship between optimum corn yields and the amount of nitrogen needed to produce those yields.”

“The soil supplies unpredictable amounts of N” •“Plant available N varies widely from year to year”

Corn & Soybean Digest January 2007, data and quotes from
University of Minnesota
University of Illinois
University of Wisconsin
Iowa State University

Iowa State EONR in Corn
Sawyer et al. (2006) "Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn"

Ohio State Preplant Nitrogen Optimum N Rates
Lahoma Data (NDVI)
Lahoma Data (Yield)
EONR versus wheat grain yield, experiment 502, Lahoma, 1971-2008
FOLIAR Nitrogen
Influence of late-season foliar nitrogen applications on yield and grain nitrogen in winter wheat

Foliar N in Chickpeas

Foliar N in Apples

Foliar N in Citrus

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