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Availability of Water Absorbed by Hardwood Bark Soil Amendment¹

This laboratory investigation determined the ‘availability’ of water absorbed by hardwood bark soil amendment. Water retention isotherms on a volumetric basis were determined on bark samples of seven different species (Fraxinus americana L., Populus deltioides Bartr., Acer rubrum L., Quercus rubra L., Platanus occidentalis L., Juglans nigra L., and Quercus alba L.) with a water pycnometer and a thermocouple psychrometer. Available water was assumed to be the volume held between O and –15 bars water potential. Maximum bark water content averaged about 40% of its wet volume; however, less than 25% of this water is released at water potentials between O and –15 bars. Hence, about three-fourths of the water absorbed by bark is unavailable to plants.

Key Words: Thermocouple psychrometer • Container soil mixtures

² Assistant professor of plant physiology in horticulture.

Received for publication September 20, 1974.

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