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A simple, inexpensive humidity cabinet is described which can be assembled inside a standard walk-in growth chamber. When container-grown tree or shrub seedlings were placed in the cabinet and held under complete darkness, high humidity, and constant temperature, xylem water potentials were at or near equilibrium after 2 days and remained relatively constant throughout a subsequent 7-day incubation period. Rapid, reproducible measurements of xylem water potentials of leaves and (or) shoots were made with a pressure bomb, leaving plants basically intact for studies on the influence of water stress on disease susceptibility.
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Donald F. Schoeneweiss (1975) studied this question.
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