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Sensitivity of Chlorophyll Meters for Diagnosing Nitrogen Deficiencies of Corn in Production Agriculture

^a Statistical Consulting Center, Wright State Univ., 130 MM Bldg., 3640 Colonel Glenn Hwy., Dayton, OH 45435
^b in memory, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
^c Wilbur Ellis Company, 150 Burlington St., Pasco, WA 99301
^d Dep. of Statistics, Iowa State Univ., Ames, IA 50011

View larger version (29K): [in this window] [in a new window]   Fig. 1. Relationships between chlorophyll meter readings (CMRs) and corn yields in test plots within each of three field-scale trials where various rates of N were applied. Solid dots indicate values from plots having the highest rate of N.

View larger version (20K): [in this window] [in a new window]   Fig. 2. Relationships between chlorophyll meter readings (CMRs) and corn yields for pooled data from three field-scale trials where various rates of N were applied. Solid dots indicate values from the reference plots receiving the highest rate of N.

View larger version (35K): [in this window] [in a new window]   Fig. 3. Relationships between relative chlorophyll meter readings (CMRs) and relative yields of corn in test plots within each of three field-scale trials where various rates of N were applied.

View larger version (21K): [in this window] [in a new window]   Fig. 4. Relationships between relative chlorophyll meter readings (CMRs) and relative yields of corn for pooled data from three field-scale trials where various rates of N were applied.