Controlling Root and Weed Growth in a Nursery Crop Sandbed Subirrigation System

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  • 1 Dept. of Horticulture, North Willamette Research and Extension Center, Oregon State Univ., 15210 NE Miley Road, Aurora, OR 97002-9543

Roots growing out of container drainholes, and weeds growing on the sandbed surface, are the two major problems associated with the use of sandbed subirrigation systems for nursery crop production. Adjusting the water level within the sandbed, application of herbicides to the sandbed surface, placing weed barriers on the sandbed surface, and placing copper hydroxide-treated weed barriers on the sandbed surface were tested to control rooting-out and weed growth. Coppertreated barriers provided the best control of rooting-out and weed growth without reducing the shoot growth of heather, forsythia, or weigela. Several herbicides provided good control of rooting-out and weed growth without reducing the shoot growth of daphne.

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