Table of Contents Timothy K. Broschat and Kimberly A. Moore Fertilization Rate and Placement Effects on Areca Palms Transplanted from Containers or a Field Nursery ......................................................................................................................... 146 Abstract. Areca palms (Dypsis lutescens [(H. Wendl.) Beentje and J. Dransf.]) were transplanted from containers or a field nursery and were treated with fertilizer placed at the bottom of the planting hole, incorporated into the backfill, or on the surface of the root ball to determine the effects of fertilizer placement at planting on palm growth and quality. Fertilizer was applied at 0, 250 g (20 g N), or 500 g (40 g N) per tree for each placement method to determine fertilization rate effects. Areca palms transplanted from containers grew best when fertilizer was incorpo- rated into the backfill, but any fertilizer placement or rate was better than no fertilizer. When areca palms were transplanted from a field nursery, there was no consistently best fertilizer placement method. However, fertilized plants grew better and had less severe nitrogen and potassium deficiency symptoms than unfertilized palms. There was no benefit to higher fertilization rate for either container- or field-grown areca palms. Key Words. Areca; Dypsis lutescens; Nitrogen Deficiency; Plant Establishment; Potassium Deficiency; Root Growth. Barbara A. Fair, James D. Metzger, and James Vent Characterization of Physical, Gaseous, and Hydrologic Properties of Compacted Subsoil and its Effects on Growth and Transpiration of Two Maples Grown Under Greenhouse Conditions .................................................................................................................................... 151 Abstract. City foresters and horticulturists oſten seek trees suited for urban conditions. Two maples oſten used were selected to assess response to compacted soil: ‘Armstrong’ Freeman maple and ‘Brandywine’ red maple. Soil physical parameters were assessed to determine effects of high density on movement of gas and water. Rigid-walled lysimeters constructed from polyvinyl chloride pipe were filled with clay subsoil compacted to 1.64 g·cm-3 (MODERATE-density) and 1.78 g·cm-3 (HIGH-density). Compaction decreased total porosity and saturated tion. Trees growing in MODERATE-density soils had higher transpiration rates than trees growing in HIGH-density soils, although differences decreased over time. A high soil density did not affect caliper growth, but did reduce annual height growth, leaf area and dry weight, and stem dry weight, but responses varied over time and between species. Root dry weight and volume were unaffected by compaction, but root:shoot ratio was higher for trees growing in HIGH-density soils, which is expected as aboveground biomass is typically reduced by soil compaction. Key Words. Acer × freemanii ‘Armstrong’; Acer rubrum ‘Brandywine’; Bulk Density; Lysimeter; Saturated Hydraulic Conductivity; Soil Compac- tion; Transpiration; Urban Forestry. hydraulic conductivity. In addition, CO2 concentrations in compacted soil were 5–18 times higher than atmospheric concentrations, while O2 concentrations were similar to atmospheric levels despite density. O2 concentration played no real role in plant growth response to compac- Yaoqi Zhang and Bin Zheng Urban Trees Programs from Municipal Officials' Perspective: Evidence from Alabama, U.S. ............................................................................................................................... 160 Abstract. Using survey data, this study explored Alabama municipal employees and policy makers’ perception of urban trees, financing, governing, and information sharing regarding urban forest management. Results suggest that the importance of urban trees is widely recog- nized by local municipal employees and policymakers. They also believe that urban trees would increase property value and promote com- munity pride. Ecological benefits were, however, less valued. Alabama, U.S. cities spent less than USD $60,000 per year on tree planting, tree maintenance, debris, and tree removal. Cities with a large population usually appear to spend more on urban trees; likewise, cities with higher household incomes and lower poverty rates would have higher expenditures on urban tree programs. Relatively minor differ- ences were found among the three types of employees and administrators: mayors, council members, and administrators. The results indicate many municipal officials were not aware of, or informed about, related agencies providing urban tree management Key Words. Environmental Awareness; Municipal; Perceptions; Public Infrastructure; Regional Development; Survey; Urban Planning. services. ©2012 | International Society of Arboriculture | ISSN:1935-5297
July 2012
| Title Name |
Pages |
Delete |
Url |
| Empty |
Search Text Block
Page #page_num
#doc_title
Hi $receivername|$receiveremail,
$sendername|$senderemail wrote these comments for you:
$message
$sendername|$senderemail would like for you to view the following digital edition.
Please click on the page below to be directed to the digital edition:
$thumbnail$pagenum
$link$pagenum
Your form submission was a success. You will be contacted by Washington Gas with follow-up information regarding your request.
This process might take longer please wait
