... window (Asamoah, 198 4), a minirhizotron (Hendrick and Pregitzer, 199 2a), or a large walk-in facility (Rogers, 193 9b, 196 9; Rogers and Head, 196 3;Fogel and Lussenhop, 199 1).Indirect Methods. The ... Free-man and Smart, 197 6; Karnok and Kucharski, 198 2). The most recent are at Pell-ston, Michigan, U.S.A. (Fogel and Lussenhop, 199 1) and Bangor, Wales (Sack-ville-Hamilton et al., 199 1a). Most ... coring and by the minirhizotron (Sanders and Brown,472 Atkinson and DawsonCopyright © 2000 Marcel Dekker, Inc. and Murray, 196 8; Taylor, 196 9; Hilton et al., 196 9; Soileau et al., 197 4; Free-man...