Observation of roots intersecting minirhizotrons is accomplished using a video camera, a small monitor, and a videocassette recorder (VCR) or writable compact disc (CD). The image produced by the camera is observed in the monitor and recorded simultaneously. During recording, the camera is moved from the bottom of the tube upward at a speed of approximately 0.3 cm per second or less, recording a 2-cm wide picture strip. This allows observation and counting of roots and minimizes field operation time.
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