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Fig. 4. Total photosynthetically active radiation (PAR) intercepted (%) by the canopy during the period from 0900 to 1700 h each day from V12 to 4 wk after silking in the two maize hybrids grown with 0 kg N ha–1 at a plant population density of 75 000 plants ha–1 (A) in 2003, (B) in 2004, and (C) effect of plant population at V12 and silking (R1) stages measured by Decagon AccuPAR in 2004. The bars associated with different letters in (C) are significantly different at P 
0.05 for each stage of measurement.
