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R.C. Beeson Jr.

Rooted photinia (Photinia ×fraseri) cuttings and hare-root slash pine (Pinus elliottii Engelm.) seedlings were transplanted initially into 0.9-, 2.9-, and 10.2-liter containers. A subset of these plants was transplanted from 0.9- and 2.9-liter containers into the next larger container size in the series (upcanning) until representative plants of each initial container size were growing in 10.2-liter containers. The photinia experiment was conducted with two fertilizer regimes [soluble vs. controlled-release (CR) fertilizer] superimposed. When CR fertilizer was used, upcanning from 2.9- to 10.2-liter containers produced the largest photinia. However, for pine, there was no advantage due to upcanning. When soluble fertilizer was used, photinia initially transplanted into 0.9-liter containers and upcanned to 2.9- and then to 10.2-liter containers had superior growth compared to those of other fertilizer × container combinations. Upcanning generally maintained or increased plant growth rate, while growth rates of plants kept in the same container generally declined the second season. Improved efficiency of the root system in nutrient absorption of upcanned plants is proposed as the mechanism for this response.

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James R. Dunlap, Yin Tung Wang, and James L. Carson

Seedling transplants produced for early fall and spring establishment of commercial vegetable crops in the Texas Lower Rio Grande Valley rapidly develop excessive shoot growth if field plantings are delayed. Therefore, several varieties of pepper, watermelon, muskmelon, and tomato transplants were treated at the 2-3 leaf stage by foliar spray with 0, 4, 8, or 12 ppm of the triazole growth retardant, uniconazole. The seedlings were field transplanted 3 weeks later. Total heights taken at the time of transplanting indicated significant varietal differences in responses to the treatments. After 60 days in the field, one of the 5 pepper varieties continued to express retarded growth. However, the uniconazole treatment stimulated early fruiting in 2 of the varieties. Tomato seedlings appeared to overcome the stunting within the first 60 days after transplanting while muskmelon and watermelon remained slightly dwarfed. Additional data on total growth and yield in response to the growth retarding treatments will be presented for each of the vegetable varieties.

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Roger Kjelgren

Changes in foliage temperature with environmental conditions were investigated for use in detecting water stress and scheduling irrigations of woody nursery plants. Midday leaf-minus-air temperature (Tl-Ta) and vapor pressure deficit (VPD) were monitored seasonally for container-grown shrubs--prostrate juniper, upright juniper and dwarf red-stem dogwood--at open and closed spacings. There was an inverse relationship between Tl-Ta and VPD for all species and spacings but with substantial scatter. Slopes for openand closed-spaced shrubs were not significantly different for any species. As container moisture and predawn leaf water potential declined during a dry-down cycle Tl-Ta increased significantly over well-watered levels for open-spaced plants and closed-spaced dogwood. In a field experiment Tl-Ta and VPD were monitored in young London plane, flowering pear, and redbud with-and-without irrigation. Only irrigated London plane Tl-Ta was inversely related to VPD. Leaves coated with petroleum jelly, however, had Tl-Ta levels consistently greater than uncoated leaves in all species, and non-irrigated Tl-Ta rose to those levels during a mid-summer drought. These results suggest that irrigation of container shrubs can be timed to increases in Tl-Ta with VPD, while comparing coated and non-coated Tl-Ta may be more successful for irrigated field production.

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S. Christopher Marble, Amy Fulcher, and Richard Karel

multiple faculty members divided the responsibility. A critical requirement for the curriculum developer was in-depth, yet broad knowledge of nursery production. In this case, the curriculum developer was a postdoctoral scholar with nursery production

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Ada Baldi, Anna Lenzi, Marco Nannicini, Andrea Pardini, and Romano Tesi

, included organic substrates such as peat, the amount of naturally occurring available nutrients is small ( Dresbøll, 2004 ; Raviv et al., 1986 ). Fig. 1. Nursery production and use of warm season prerooted plug plants in turfgrass industry: (A) donor

Open access

Anthony L. Witcher, Fulya Baysal-Gurel, Eugene K. Blythe, and Donna C. Fare

.J. 2015 Influence of shading on container-grown flowering dogwoods. Proc. Southern Nursery Assn. Res. Conf. 60:11–18 Fulcher, A.F. White S.A. 2012 IPM for select deciduous trees in southeastern US nursery production. Southern Nursery IPM Working Group

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Richard C. Beeson Jr

explain observations noted decades earlier in rhododendron nursery production. The objectives of this research were to verify theoretical reductions in plant evapotranspiration with increases in canopy closure and to begin defining the depth of the upper

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Amanda Bayer, John Ruter, and Marc W. van Iersel

leaching in a commercial nursery Proc. Southern Nursery Assn. 54 17 21 van Iersel, M.W. Chappell, M. Lea-Cox, J.D. 2013 Sensors for improved efficiency of irrigation in greenhouse and nursery production HortTechnology 23 735 746 Warsaw, A.L. Fernandez, R

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Amy L. Shober, Christine Wiese, Geoffrey C. Denny, Craig D. Stanley, Brent K. Harbaugh, and Jianjun Chen

Substitutions for peat in Hawaii nursery production Hawaii Cooperative Extension Service. 1 3 Holmes, S. 2009 Growing media developments in the UK Acta Hort. 819 23 26 Hue, N.V. Sobieszczyk, B

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Michael A. Arnold and W. Edgar Davis

Growth and post-transplant establishment of half-sib seedlings from two elite sycamore (Platanus occidentalis L.) mother trees (Westvaco Corp.) and seedlings from a bulk seed lot from elite sweetgum (Liquidambar styraciflua L.) trees (Scott Paper Co.) were compared to that of seedlings from a native (Cookeville, TN) sycamore tree and a commercial source of sweetgum seeds. Seedlings were grown under standard field nursery conditions for two years, dug hare-root in autumn, and transplanted to another site to simulate landscape planting. Growth of elite seedlings during production was increased by 11 to 22% in height and 10 to 118 in caliper compared to that of conventional seed sources. Growth differences were maintained following transplanting. The primary lateral root number at transplanting was increased by 2 to 3 on elite sycamore seedlings compared to conventional seedlings. The number of pruning cuts required to eliminate multiple leaders tended to be less for elite seed sources. Survival did not differ among seed sources within a species.