Search Results

You are looking at 1 - 10 of 24 items for

  • Author or Editor: Patricia Knight x
Clear All Modify Search
Free access

Glenn B. Fain and Patricia R. Knight

On 24 Apr. 2003, 3-gallon (11.4-liter) Quercus shumardii were potted into 13.2-gallon (50-liter) containers using a standard nursery mix. Treatment design was a 3 × 2 × 2 factorial with two fertilizer placements, three irrigation methods, and two herbicide rates. Controlled-release fertilizer 17N–2.9P–9.8K was dibbled (placed 10.2 cm below the surface of the container media at potting) or top-dressed at a rate of 280 grams per container. Irrigation was applied using one of three methods: 1) a spray stake attached to a 3-gallon- (11.4-L-) per-hour pressure compensating drip emitter; 2) a surface-applied pressure-compensating drip ring delivering water at a rate of 2.3 gallons (8.9-L) per hour; and 3) the same drip ring placed 4 inches (10.2 cm) below the container substrate surface. A granular preemergent herbicide (oxyfluorfen + oryzalin) was applied at 2.0 + 1.0 lb/acre (2.24 + 1.12 kg·ha-1). At 75 days after treatment (DAT), containers with no herbicide and top-dressed fertilizer had a percent weed coverage of 46% compared to 18% for dibbled containers with no herbicide. At 180 DAT weed top dry weight was greater for top-dressed containers compared to dibbled. None of the treatments in the study had any effect on height increase. At 240 DAT, trees irrigated with drip rings at the surface had a 28% greater caliper increase among the dibbled fertilizer-treated containers. Trees irrigated with the drip ring placed below the surface and fertilizer top-dressed had the smallest caliper increase. Irrigation method had no effect on weed control in this study; however, a repeat fall application showed a significantly greater weed control with the drip ring below surface compared to the spray stake.

Free access

J. Roger Harris, Patricia Knight and Jody Fanelli

Two rootball sizes as well as a nontransplanted control were randomly assigned to Acer saccharum Marsh. (sugar maple) trees in four adjacent nursery rows at Waynesboro Nurseries in Waynesboro, Va. One size (75 cm in diameter) corresponded to the American Association of Nurserymen standards. The other rootball size was 90 cm in diameter. Trees were transplanted just before bud swell or during shoot elongation. Rootball size had no effect on height, stem diameter, or twig growth, total nonstructual leaf nitrogen content (LNC), or total stem nonstructual carbohydrate (TNC). Height growth was reduced by 81%, stem diameter growth by 71%, and twig growth by 82% for trees transplanted before bud swell compared to nontransplanted trees. LNC was 25% more on transplanted trees than on nontransplanted trees, presumably due to a dilution effect. TNC was 20% higher on transplanted compared to nontransplanted trees. Growth was severely curtailed on late-transplanted trees for all characteristics measured compared to all other treatments.

Free access

J. Roger Harris, Patricia Knight and Jody Fanelli

The effect of fall vs. spring transplanting was tested on landscape-sized Chionanthus virginicus L. at a research farm in Blacksburg, Va. Two fall transplanting dates (11 Nov. and 1 Dec. 1994) were selected so that soil temperatures were decreasing and near 10 °C for the earlier fall date (11 Nov.) and decreasing and near 5 °C for the later fall transplanting date (1 Dec.). The spring date (14 Mar. 1995) was selected so that soil temperatures were increasing and near 5 °C. All trees were transplanted with rootballs of native soil wrapped in burlap (B&B). Fringe tree was clearly tolerant of fall transplanting. Trees transplanted on 11 Nov. had a larger leaf area 1 month after bud set the next summer and had wider canopies and more dry mass of new roots at leaf drop than trees transplanted on the other dates. Trees transplanted on 14 Mar. had less total leaf area, leaf dry mass, and lower maximum root extension into the backfill soil than trees transplanted on 11 Nov. or 1 Dec. No root growth occurred beyond the original rootball until about early July (1 month after bud set) in any treatment, suggesting that first season posttransplant irrigation regimes need to focus on rootballs, not surrounding soil areas.

Free access

Ashley N. Pollard*, Patti C. Coggins and Patricia R. Knight

Flowers are traditionally used to flavor and garnish dishes. There are many different varieties of edible flowers such as daylilies (Hemerocallis sp.). Daylilies come in many varieties and colors. Their blooms and buds are tasty and nutritious. The objective of this study was to indicate most preferred to least preferred among 15 daylily cultivars (Gentle Shepherd, Lavender Doll, Siloam Powder Pink, Aztec Gold, Rosie Meyers, Catherine Woodberry, Pink Charm, Virginia Henson, Lemon Yellow, Joan Senior, Along the Way, Border Baby, Bonanza, Pandora's Box, and Apricot Beauty). A consumer panel was conducted evaluating the taste preference of fifteen participants to an assortment of daylilies. Panelists were associated with Mississippi State Univ.. Each panelist received 15 different daylily blooms. The ranking methods and analysis of variance were used to determine the preference. The questionnaire for ranking given to each panelist stated to “Please taste each numbered sample and rank in order of preference with the first being most preferred and last being least preferred and to provide comments.” Among the 15 daylilies tested, Rosie Meyer was the most preferred, followed by a second group that consisted of Lavender Doll, Jones Senior, and Aztec Gold. The third most preferred group consisted of two, Gentle Shepherd and Along the Way. The preference for the remainder tapered off with the last two samples, Bonanza and Border Baby. These results suggest that of the 15 daylily varieties, Border Baby and Bonanza were statistically non-preferred with no daylily being statistically preferred.

Free access

Patricia R. Knight, John M. Anderson and Ralph A. Parks

The influence of media on plant growth was investigated for five annual species. Uniform 164-cm3 liners of Tagetes erecta `Discovery Orange', Impatiens wallerana `Accent Orange', Melampodium paludosum `Showstar', Scaevola aemula `New Wonder', and Petunia axillaris `Surfinia White' were planted into 2.8-L containers on 4 Apr. 1997. The experiment was terminated after 90 days. Media included Metro-Mix 366 peat or coir, Metro-mix 700 peat or coir, and 4 pine bark : 1 sand (by volume, amended with 1.2 kg.m-3 dolomitic limestone). Plants were top-dressed with 9 g Osmocote Plus 15-9-11. Substituting coconut coir for peat moss in commercial media reduced Petunia 90 DAT foliar color ratings, Impatiens shoot dry masses, and Melampodium and Scaevola root ratings. Utilization of pine bark did not influence foliar color ratings of Tagetes, Melampodium, Petunia, or Scaevola 90 DAT. Utilization of pine bark reduced shoot dry masses of Impatiens, Melampodium, and Scaevola, and root ratings of Melampodium and Tagetes.

Free access

Patricia R. Knight, John M. Anderson, Wayne McLaurin and Christine Coker

Lagerstroemia indica ×fauriei `Tonto' and `Sioux' were planted in Mar. 1995. All other cultivars were planted in Oct. 1985. Plants were planted into a Ruston sandy loam on a 12 × 12 ft (3.7 × 3.7 m) spacing. Trees were pruned to develop multiple trunks. Trees are pruned annually in winter to remove any limbs smaller than 0.6 cm in diameter. Pruning cuts are made 6–8 in (15.2–20.3 cm) above prior cuts. Severe pruning is performed every 5 years. Trees were evaluated at 2-week intervals during the flowering season to determine total length of flowering and duration of good to superior flowering. Growth indices (height + width + perpendicular width)/3 were recorded after plants were dormant. Total days of flowering and floral display (0–5 with 0 representing no flowers and 5 representing superior flowering) were rated. `Muskogee' had the greatest growth index after the 2004 growing season. `Seminole' had the least. However, `Seminole' had the greatest number of flowering days. `Biloxi' had the fewest flowering days. `Tonto' had the most good to superior flowering days, while `Tuskegee' and `Muskogee' had the fewest. In 2005, `Muskogee' again had the greatest growth index, while `Sioux' had the least. `Yuma' and `Seminole' had the greatest number of flowering days, and `Biloxi' again had the fewest. `Tonto' again had the most good to superior flowering days, while `Biloxi' and `Acoma' had the fewest.

Free access

Patricia R. Knight, D. Joseph Eakes and Charles H. Gilliam

Two inch caliper Acer rubrum, Quercus phellos, and Platanus occidentalis were planted March 26, 1990, into 8' × 8' planting holes that were lined with either Typar Biobarrier, Dewitt Pro-5 Weed Barrier or left unlined as a control. There has been little or no root penetration beyond the Biobarrier for the 3 tree species during the first 3 years of this study. At the end of 1990, the control and the Dewitt Pro-5 had similar root penetration numbers. By the end of 1991, the Dewitt Pro-5 had greater root penetration than did the control for A. rubrun. Root penetration of Dewitt Pro-5 and the control treatment was similar for Q. phellos and P. occidentalis. There were no differences in root penetration for Dewitt Pro-5 and the control in 1992 for any species. There were no differences in height for any tree species following the 1990 or 1991 growing seasons and no difference following the 1992 growing season for A. rubrum and Q. phellos. The control treatment had the grearest height for P. occidentalis in 1992. There were no differences in caliper due to root control treatment for the 3 species during the first 3 years of this study.

Full access

Christine E. Coker, Patricia R. Knight and John M. Anderson

Sun coleus (Solenostenum scutellarioides) are commonly used in the southern landscape. However, with the introduction of new cultivars, producers and consumers may be unaware of the selection and landscape performance of sun coleus. Sun coleus cultivars were trialed under landscape conditions at the South Mississippi Branch Station in Poplarville, Miss., in 2000 and 2001. The objective of this study was to evaluate sun coleus cultivars based on landscape performance criteria including flowering, durability, vigor, uniqueness, and insect and disease resistance. Cultivars performing well over both years included `Ducksfoot Red,' `Ducksfoot Tricolor', `Ducksfoot Yellow', `Sunflower Red', `Pineapple', Mardi Gras', and `Saturn'.

Free access

Cecil Pounders, Tim Rinehart, Ned Edwards and Patricia Knight

Breeding of crapemyrtle (Lagerstroemia) in the United States has focused on developing hybrids between parents with disease or pest resistance and those with good floral characteristics. The objective of this work was to study the general and specific combining ability of several horticulturally important traits in crosses between pest-resistant parents and those with saturated flower colors. Ten crapemyrtle parents were tested in a factorial mating design including 25 of the 29 possible families. Analysis of variance revealed significant differences (P ≤ 0.05) for all traits for the general combining ability of parents. The cross between ‘Arapaho’ and ‘WHIT IV’ displayed the best specific combining ability for a desirable combination of height, leaf-out time, bloom time, and flower color based on current breeding objectives. Overall, this study revealed the importance of both additive and nonadditive genetic variability in crapemyrtle, suggesting that an integrated breeding strategy to capture both additive and dominance variance would be appropriate for producing new, improved crapemyrtle clones for the four traits evaluated.

Free access

Patricia R. Knight, John M. Anderson, Wayne McLaurin and Christine Coker

Lagerstroemia indica x fauriei `Tonto' and `Sioux' were planted in March, 1995. All other cultivars were planted in October, 1985. Plants were planted into a Ruston sandy loam on a 12 × 12 ft (3.7 × 3.7 m) spacing. Trees were pruned to develop multiple trunks. Trees are pruned annually in winter to remove any limbs smaller than ¼ in (0.6 cm) in diameter. Pruning cuts are made 6–8 in (15.2–20.3 cm) above prior cuts. Severe pruning is performed every five years. Trees were evaluated at 2-week intervals during the flowering season to determine total length of flowering and duration of good to superior flowering. Growth indices (height + width + perpendicular width)/3 were recorded after plants were dormant. Total days of flowering and floral display (0–5 with 0 representing no flowers and 5 representing superior flowering) were rated. `Muskogee' had the greatest growth index after the 2004 growing season. `Seminole' had the least. However, `Seminole' did have the greatest number of flowering days. `Biloxi' had the fewest flowering days. `Tonto' had the most good to superior flowering days while `Tuskegee' and `Muskogee' had the fewest.