| Effects of a Control Release Nitrogen Fertilizer and Thinning on the Nitrogen Dynamics of a Mid-Rotation Loblolly Pine Stand in the Piedmont of Virginia | |
Abstract/OtherAbstract
:
|
Nitrogen deficiency is characteristic of many mid-rotation loblolly pine (Pinus taeda L.) plantations in the Piedmont region of the southeastern USA. Fertilization with urea is the most common method used to correct this deficiency. Previous studies show that urea fertilization produces a rapid pulse of available nitrogen (N) with only a portion being utilized by plantation trees. Controlled release fertilizers release available N more slowly over a longer period of time and therefore may result in greater uptake efficiency. The objective of this study was to compare Nitroform®, a urea-formaldehyde controlled release N fertilizer versus urea and a control by measuring the effects of the two fertilizer treatments on N availability and loss as: total KCl extractable-N, total ion exchange membrane-N (IEM-N), N mineralization, and N volatilization, in a mid-rotation loblolly pine plantation in the Piedmont of Virginia. In addition, mid-summer and mid-winter fertilizations were compared to assess fertilizer uptake as a function of season. After the summer fertilization, Nitroform® significantly increased total KCl-extractable N, IEM-N, and N mineralization for two to three months over urea and the control. Three hundred times more N volatilized from urea than from controlled release Nitroform®. Interestingly, seven months after the summer application, the controlled release Nitroform® showed marked immobilization for three months while urea demonstrated greater N mineralization. After the winter application, fertilization with urea demonstrated greater soil inorganic N concentrations for two to three months over Nitroform®, very little N was immobilized, and volatilization was only 10 times that of Nitroform®. After summer and winter fertilizations, both fertilizer treatments significantly increased soil inorganic N concentrations and N volatilization over controls, however did not significantly increase N mineralization over controls when average response was tested over the entire sampling period. In addition to the fertilizer effects measured, a thinning only treatment was also incorporated into this study with soil N-availability indices compared to a control with no thinning or fertilization. The results from the thinning only treatment demonstrated no significant increases over the control in total KCl extractable-N, IEM-N, N-mineralization, or N volatilization when average responses were tested over the entire sampling period. |
Authors
:
|
Elliot, James Robertson |
Related Documents
:
|
0001143563 - Effect of phosphorus and potassium application on growth and yield of mungbean (<i>vign... 0001120353 - Effect of organic and inorganic fertilizer application on maize fodder production 0003744853 - Influence of modelled soil biogenic no emissions on related trace gases and the atmosph... |
Contributors
:
|
W. Michael Aust, H. Lee Allen, James A. Burger, Thomas R. Fox |
Publication Detail
:
|
Publisher : VT Type : text Format : application/pdf |
Date Detail
:
|
2008-01-16 |
Subject
:
|
Forestry |
Coverage
:
|
- |
Relation
:
|
- |
Source
:
|
http://scholar.lib.vt.edu/theses/available/etd-12202006-213850/ |
Copyright Information
:
|
restricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
Other Details
:
|
Languages : en |
Export Citation
:
|
APA/MLA Format Download EndNote Download BibTex |
Previous Document: The effect of resource stoichiometry on fish and macroinvertebrate nutrient excretion.
Next Document: Part 1 Design, Synthesis and Bioactivity of a Phosphorylated Prodrug for the Inhibition of Pin1 Part...