Water Requirements and Growth of Irrigated Hybrid Poplar in a Semi-Arid Environment in Eastern Oregon
Abstract:Potential growth of poplar (Populus deltoides P. nigra.) is highly dependent on the amount of applied irrigation and soil moisture. Hybrid poplar (cultivar OP-367) was planted at 222 trees/ac in April 1997 at the Oregon State University Malheur Experiment Station near Ontario, OR. Six irrigation treatments included a combination of soil water potentials as thresholds for initiating irrigation and varying water application rates. Water was applied via micro-sprinklers installed along the tree rows. Results indicated that for optimum poplar growth, soil water potential at an 8 in. depth should average above -20 kPa (kPa = cbar) during the growing season. This was achieved by irrigating when the soil water potential reached -25 kPa and applying 21 ac-in./ac of irrigation water during the first year, 35 ac-in./ac during the second year, and 44 ac-in./ac during the third year. By the end of the third year, trees receiving optimum irrigation averaged 26 ft tall and produced 256 ft3 of wood/ac. West. J. Appl. For. 17(1):46–53.
Keywords: Hybrid poplar; diameter; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; granular matrix sensor; height; irrigation; natural resource management; natural resources; soil water potential; volume growth; water use
Document Type: Miscellaneous
Affiliations: Malheur Experiment Station, Oregon State University, Ontario, OR, 97914
Publication date: January 1, 2002
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