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dc.contributor.authorTacilla Villanueva, Antonioen_US
dc.date.accessioned2015-07-07T08:00:37Z
dc.date.available2015-07-07T08:00:37Z
dc.date.issued2015-07-06en_US
dc.identifier.othervt_gsexam:6013en_US
dc.identifier.urihttp://hdl.handle.net/10919/54020
dc.description.abstractWe examined the effects of periodic nitrogen (N) and phosphorus (P) fertilizer applications on the O horizon and mineral soil in loblolly pine (Pinus taeda L.) plantations over a 12-year period. To accomplish this, we used 9 experimental sites located across the south, which were grouped using the CRIFF Classification System. Group 1�"CRIFF A, B (poorly-drained Ultisols); group 2�"CRIFF C, D, G (sandy Spodosols and Entisols); and group 3�"CRIFF E, F (well-drained Ultisols). Fertilization rates were 135, 202, and 269 kg N ha-1 at 4 years application frequency. This resulted in a cumulative N application rate of 540, 808, and 1076 kg ha-1. P was added at 10% of the N rate. Fertilization increased the mass, N content, and P content of the O horizon in all soil groups. Fertilization did not impact mineral soil N. No significant increases in total N trends were observed to a depth of 1 m. Likewise, total inorganic N (NH4+ + NO3-) was not affected by fertilization. These results suggest that N fertilization will have little effect on long-term soil N availability regardless of soil types. In contrast, fertilization increased extractable P in soil CRIFF groups 1, 2, and 3 by 26, 60, and 4 kg P ha-1 respectively suggesting potential for long-term soil P availability and site quality improvement. However, the low extractable P in soil group 3 implies additional fertilization with P for the next rotation for sites included into this soil group.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectForest fertilizationen_US
dc.subjectnitrogenen_US
dc.subjectphosphorusen_US
dc.subjectO horizonen_US
dc.subjectKCl extractableen_US
dc.subjectsoil nutrient availabilityen_US
dc.titleImpacts of Fertilization on Soil Properties in Loblolly Pine Plantations in the Southeastern United Statesen_US
dc.typeThesisen_US
dc.contributor.departmentForest Resources and Environmental Conservationen_US
dc.description.degreeMSen_US
thesis.degree.nameMSen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineForestryen_US
dc.contributor.committeechairFox, Thomas Ren_US
dc.contributor.committeememberAust, Wallace Men_US
dc.contributor.committeememberStrahm, Brian Daleen_US


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