Abstract
Diffusion pressure deficits and osmotic pressures in excised leaves of pepper, trefoil, and cotton were measured with a thermocouple psychrometer. Leaves or sections of leaves were placed in sample containers at 25.000+0.001[degree]C. The relative humidity in the sample container was determined with a wet and dry junction and osmotic pressures in the leaves of trefoil and pepper increased as the relative water content of the leaves decreased.

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