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Comparison of corn leaf nitrogen concentration and chlorophyll meter readings

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Maize leaf discs (1-cm diam) were sampled from a variety of hybrids grown in N fertilizer trials at 4 sites in Nebraska and 1 in Illinois. N concentrations and SPAD 502 chlorophyll meter readings were compared at silking. Chlorophyll meter readings correlated well with leaf N concentrations for a given hybrid and location, but it was suggested that the calibration of chlorophyll meters to determine crop N status may not be practical because of the unique greenness characteristics of different hybrids. Normalization procedures can, however, be used to standardize the tissue testing approach across hybrids, location and growth stages. This can be achieved by comparing chlorophyll meter readings from plots given adequate fertilizers to those from the test area.
Schepers, J.S. , Francis, D.D. , Vigil, M. , Below, F.E.
In the Special Issue: International symposium on soil testing and plant analysis in the global community. Paper presented at the second international symposium, August 22-27, 1991, Orlando, Florida.
Communications in soil science and plant analysis 1992. v. 23 (17/20)
Journal Articles, USDA Authors, Peer-Reviewed
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