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Steven E. Newman and Jesse R. Quarrels

Many nurseries are using the pot-in-pot (PNP) system to grow trees in containers. This system protects the roots from temperature extremes and prevents tipping. PNP is not without problems, trees with vigorous roots may escape the container and root into the external soil making harvest difficult. PNP has no effect on root circling. Our objective was to determine if a polypropylene fabric disk treated with either trifluralin or copper placed in the bottom of a container would prevent root circling. Cercis canadensis and Quercus shumardii seedlings were grown in 19 liter polyethylene containers with eight root control treatments, which included trifluralin or copper impregnated polypropylene fabric disks placed in the bottom of the containers. Ttifluralin treatments, BioBarrier and trifluralin impregnated fabric, had few roots in the bottom of the containers. Of the copper treatments, Spinout® impregnated fabric was the only copper treatment that had any effect on root development in the bottom of the containers.

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Edward F. Gilman, Gary W. Knox, Catherine A. Neal, and Uday Yadav

Lagertroemia indica L. × fauriei Koehne (`Natchez' crape myrtle) crown width increased after 13 months as irrigation frequency increased from every 3 days to every day, and the irrigated area around the fabric container increased from 20% to 100% of the circular area within 20 cm beyond the container. Restricting irrigation to within the fabric container plus 20% of the area 20 cm beyond the container edge resulted in less height and width for crape myrtle, but had no effect on root growth, compared to irrigating 100% of area 20 cm beyond the container. Restricting the pattern of irrigation to the container plus 20% of the area 20 cm beyond the container resulted in greater free-root weight (roots < 5 mm in diameter) within the container for laurel oak (Quercus laurifolia Michx.) compared to irrigating the container plus 100% of the area 20 cm beyond the container. Height, width, and caliper of oak were not different among treatments.

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Janet C. Cole, Roger Kjelgren, and David L. Hensley

Nursery crops have traditionally been grown in the field and harvested as balled and burlapped or bareroot plants or grown in above-ground containers. A relatively recent product, the in-ground fabric container, has allowed producers to combine advantages of field production with those of container production. The effect of these containers on plant growth, transplant establishment, plant chemical composition, and water relations appears to be species and site specific.

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Bonnie L. Appleton and Susan C. French

A commercially available copper-treated disk was evaluated for its effect on weed suppression for container-grown willow oak (Quercus phellos L.). No weeds grew in containers where disks were used. All trees grown without disks or preemergent herbicide were dead within 6 months. Top dry weights were greater for trees grown with disks or preemergence herbicide, but root dry weights were not different.

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J. Roger Harris and Edward F. Gilman

Abbreviations: CER, carbon exchange rate; FC, fabric containers; FG, field grown; PC, plastic containers; Ψ leaf , leaf water potential. 1 Current address: Urban Horticulture Institute, 20 Plant Science Bldg., Cornell Univ., Ithaca, NY 14853

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Susmitha Nambuthiri, Robert L. Geneve, Youping Sun, Xueni Wang, R. Thomas Fernandez, Genhua Niu, Guihong Bi, and Amy Fulcher

from wood pulp, 3) keratin [KR (Horticultural Research Institute, Washington, DC)] made from a chicken feather-based bioplastic, 4) a black fabric container [FB (Root Pouch, Hillsboro, OR)] made from recycled plastic, and 5) coir fiber [Coir (Retail

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Robin G. Brumfield, Alyssa J. DeVincentis, Xueni Wang, R. Thomas Fernandez, Susmitha Nambuthiri, Robert L. Geneve, Andrew K. Koeser, Guihong Bi, Tongyin Li, Youping Sun, Genhua Niu, Diana Cochran, Amy Fulcher, and J. Ryan Stewart

production (COP), cost per plant, cost per acre, and proportion of average COP for ‘Green Velvet’ boxwood grown in fabric container pots in: Michigan (MI), Kentucky (KY), Tennessee (TN), Mississippi (MS), and Texas (TX). Table 5. Input costs for total cost of

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William K. Harris, Joyce G. Latimer, John F. Freeborn, Margaret Aiken, and Holly L. Scoggins

Ornamental grasses have recently increased in popularity in the landscape and nursery industry ( Cameron, 2004 ; Thetford et al., 2009 ). Most ornamental grasses are grown in containers, and are inherently more susceptible to winter damage from

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Benjamin L. Green, Richard W. Harper, and Daniel A. Lass

-ground fabric container, and bare-root production systems. Table 2. Summary of two-sample t test statistics for testing mean planting time differences among trees from balled and burlap (BNB), pot-in-pot container (PIP), in-ground fabric container (IGF), and

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Rebecca A. Schnelle and James E. Barrett

achieve the accepted product form for retail sales in 4- to 5-inch-diameter containers. Paclobutrazol is a widely used plant growth regulator for size control of commercially produced ornamental crops such as bedding plants, bulb crops, herbaceous