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Fig. 1. In-row penetrometer resistance in April (before preplant tillage), May (corn emergence), and June (about V4) in 2000 as affected by tillage for corn. Error bars at each depth show LSD (0.10). CP+SFC, chisel plow plus spring field cultivate (SFC); ST, strip-tillage; ZT, zone-tillage; NT, no-tillage.