Using Relative Chlorophyll Meter Values to Determine Nitrogen Application Rates for Corn

By J. A. Hawkins, John E. Sawyer, Daniel W. Barker, J. Lundvall. 2007

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Active Sensor Reflectance Measurements of Corn Nitrogen Status and Yield Potential (2008, background): “Work by Blackmer et al. (1993) and Blackmer and Schepers (1994, 1995) has shown that CM assessments can be used to monitor corn N status for more effi cient fertilizer N application.”
Association of “Greenness” in Corn with Yield and Leaf Nitrogen Concentration (2011, methodology): “Th e SPAD meter is used to make an optimum fertilizer N-rate decision by measuring N stress relative to an optimum N-rate strip within a fi eld (Hawkins et al., 2007).”
Effect of fertilizer application on photosynthesis and oil yield of Jatropha curcas L. (2010, unknown): “Several other studies also supported the favorable correlation between Chl index and leaf N level; and that Chl index was useful in monitoring fertilizer management to improve fertilizerused efficiency of commercial crops (Peng et al. 1996, van den Berg and Perkins 2004, Hawkins et al. 2007).”
SPAD Values and Nitrogen Nutrition Index for the Evaluation of Rice Nitrogen Status (2014, methodology): “Hawkins et al. (2007) used RSPAD values to determine N application rates for corn.”