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  • Author or Editor: G.J. Keever x
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Pampas grass seedlings in 72-cell pack containers were transplanted into containers with a root observation window (17.8 × 10.2 cm) and treated with selected preemergence applied herbicides. Root numbers were counted in the upper and lower 8.9 cm of the viewing window until 16 days after treatment (DAT) when the windows became full of roots. Root growth in both the upper and lower window was suppressed with application of Factor 65 WG and Pendulum 60 WDG at the X and 2X rates at 16 DAT. Ronstar 2G and Pendulum 2G at the recommended rates and nontreated control plants had similar root numbers at 16 DAT. At 16 DAT, the greatest number of club roots formed on plants treated with the dinitroaniline herbicides; Pendulum 2G, Pendulum 60 WDG, and Factor 65 WG. Shoot growth was not affected by treatment.

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Uniform liners of Soft Touch Holly (Ilex crenata 'Soft Touch') and Fashion azalea {Rhododendron 'Fashion') were potted into trade gallon containers of a 3: 1 by volume pinebark: peat moss medium amended with 8.3 kg of 17-7-12 Osmocote and 0.9 kg of Micromax per m3. Dolomitic limestone rates were 0,3, and 6 kg per m3 of medium applied as a finely ground or pelletized product. Medium solution pH increased with increasing rate of dolomitic limestone. Ground dolomitic limestone had a greater impact on medium solution pH than pelletized dolomitic limestone and differences increased as rate increased. Addition of ground dolomitic limestone at 6 kg per m3 reduced foliar color and growth of azalea. Amending with dolomitic limestone had little or no effect on holly foliar color or growth, regardless of rate.

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Red maple cultivars 'October Glory' and `Northwood' were grown in 7 gallon containers to determine the influence of styrene lining and copper coating of containers on container medium temperature and growth of red maple cultivars. Copper coating effectively reduced circling of roots at the container wall-medium interface. Root control with copper was less effective on `October Glory' (a more vigorous cultivar) than on `Northwood'. Height, caliper, and root dry weight also were less for `Northwood'. In the absence of copper, surface-root coverage was greater in foam - lined containers than in containers without foam where temperatures averaged 10°C higher.

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Water samples containing 0, 2.5, 10.0, or 20.0 ppm nitrate and ammonia were evaluated under 3 temperatures (0, 6, 20C) plus or minus sulfuric acid (36N) for changes in concentration. Ammonia and nitrate levels were measured 0, 1, 2, 4, 8, 16, 24, and 32 weeks after storing. Response to storage conditions was the same regardless of acid or concentration of ammonia or nitrate. Nitrate concentrations in the storage locations were similar for the first 2 weeks. Afterwards, treatments stored at room temperature fluctuated from initial standards. With ammonia, frozen samples had the greatest deviation from initial standards during the first 4 weeks. By week 24, ammonia samples stored at room temperature had exceeded acceptable deviations from the standards. Nitrate and ammonia samples held in refrigeration had the least fluctuation during the 32 week storage period.

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In a full-sun Auburn, Ala., field study, 23 cultivars and 1 forma of Cornus florida L. were evaluated for growth from 1994 to 1996 and bract characteristics in Spring 1996. The selections were divided into three groups for analyses: 1) white bracted with green foliage, 2) red or pink bracted with green foliage, and 3) variegated foliage. Among the white bracted cultivars with green foliage, `Weaver' and `Welch Bay Beauty' had the greatest height and stem diameter increases, `Autumn Gold' the least. `Cloud 9' had the largest bract size. `Welch's Junior Miss' had the greatest height increase, while `Stokes' Pink' had the greatest stem diameter increase for the red or pink bracted cultivars with green foliage, and f. rubra the least. `Red Beauty' had the largest bract size. There were no differences among the variegated cultivars in height increase or bract size; however, `First Lady' had the greatest stem diameter increase.

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Blue color development in Hydrangea macrophylla is usually accomplished by applying Al as an alum drench. Drenches are applied during forcing 10–14 days after transplanting at a rate of 17,500 mg·L-1. Cultivars Blue Wave and Nikko Blue were used to evaluate if the Al contained in waste paper can provide the necessary Al for blue flower development. Two waste paper forms, pelletized and crumble, were used as surface mulches and as media amendments. The amendments were incorporated into the media at transplanting and mulches were applied either at transplanting or 28 days later. Alum drenching was initiated at transplanting as a control. Leachates were collected weekly using the VTEM. Total Al, electrical conductivity, and pH were determined on all samples. All waste paper treatments resulted in pink flowers in both cultivars. Leachate pH, from plants in this test, was >6.5. Aluminum concentration was greater than the 15 mg·L-1 Al needed for blue color development in flowers, but Al concentration decreased with time. Control of pH at the waste paper surface and in the media is critical for increasing the availability of labile Al for uptake by hydrangea.

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Two tree species, Acer rubrum `October Glory' (October Glory red maple) and Quercus phellos (willow oak) were planted in Columbus, GA and Mobile, AL. Variables evaluated were location (park vs residential) and tree size (1.5 vs 3.0 inch caliper). Greater shoot elongation occurred with 1.5 inch red maples and willow oaks than with 3.0 inch caliper trees. First year growth differences were not related to photosynthesis, night respiration, leaf water potential, or foliar nitrogen levels. Little height or caliper change occurred with either species. Red maple shoot elongation was greater in Mobile than into Columbus. Growth was not affected by location within either city.

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Herbicide-blended and coated fertilizers were evaluated for prostrate spurge control in containers. Ronstar 2G or Pennant 5G was blended with Nursery Special 12-6-6 fertilizer and Ronstar 50WP or Pennant 7.8E was sprayed on the fertilizer (coated). Ronstar 2G-blended fertilizer and Ronstar. 50WP-coated fertilizer provided weed control at the 4, 8, and 16 lb ai/A rates similiar to broadcast (2G) or sprayed (50WP) herbicide applied at the label rate (4 lb ai/A). Ronstar provided better prostrate spurge weed control than Pennant. Formulation had no affect on weed control when comparing blended or coated fertilizer. Herbicide-blended and coated fertilizers provided effective prostrate spurge contol in containers.

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Four wetland species, Canna flaccida (canna), Iris versicolor (iris), Spartinia alterniflora (smooth cord grass), and Juncus effusus (rush), were planted into five different trade gallon container types. The container types used were no hole pots, four holes at the bottom of the pot, four holes half way up the side wall of the pot, four holes three-quarters of the way up the side wall of the pot, and pot-in-pot which consisted of trade gallon growing pots with four holes at the bottom of the pot placed inside a full gallon socket pot with no holes. Canna visual shoot and root rating were highest for the pot-in-pot treatment. Rush pot-in-pot plants had the highest growth indices, visual shoot, and root ratings compared to the remaining four pot types. Shoot count for iris was highest for the pot-in-pot containers. Container hole position did influence growth of smooth cord grass.

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Abstract

Two experiments were conducted to determine if one-year-old field-grown Cornus florida L. seedlings could be transplanted successfully after leafing out. Survivability was improved with 100% defoliation at the time of planting. Vapor Gard used as a shoot dip and a whole plant dip had little positive effect. Root dips of a starch-based polymer and a peat and water slurry were not beneficial.

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