Comparison of Late‐Season Diagnostic Tests for Predicting Nitrogen Status of Corn

By R. H. Fox, W. P. Piekielek, K. Macneal. 2001

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Optical Sensor‐Based Algorithm for Crop Nitrogen Fertilization (2005, background): “Work in Pennsylvania by Fox et al. (2001) found that stalk NO3–N test taken 2 weeks after corn had reached physiological maturity was an excellent indicator of corn N status.”
Alfalfa Nitrogen Credit to First‐Year Corn: Potassium, Regrowth, and Tillage Timing Effects (2012, background): “Even when the lower critical values of 250 mg NO3–N kg –1 (Fox et al., 2001; Forrestal et al., 2012) for first-year silage corn after alfalfa in New York were considered, three of 16 sites tested low in BSN concentration, but corn yield at these sites did not respond to fertilizer N (Lawrence et al.”
Using Relative Chlorophyll Meter Values to Determine Nitrogen Application Rates for Corn (2007, background): “Fox et al. (2001) found that RCM values were 92% accurate in determining corn N status.”