Thesis (M.S.)--West Virginia University, 2005. / Title from document title page. Document formatted into pages; contains ix, 106 p. : ill. (some col.), map (part col.). Includes abstract. Includes bibliographical references.

Thesis (M.S.)--University of Missouri-Columbia, 2005. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (December 18, 2006). Includes bibliographical references.

Thesis (M. For. Sc.)--University of Canterbury, 2009. / Typescript (photocopy). Includes bibliographical references (leaves 42-46). Also available via the World Wide Web.

Thesis (M.Sc.)--York University, 2008. Graduate Programme in Biology. / Typescript. Includes bibliographical references (leaves 185-210). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR45967

Thesis (Ph.D.)--Drexel University, 2009. / Includes abstract and vita. Includes bibliographical references (leaves 218-227).

Thesis (Ph. D.)--University of Florida, 2003. / Title from PDF title page (viewed on July 3, 2005). Vita. Includes bibliographical references (p. 80-92).

Thesis (Ph. D.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2006. / Yen, Jeannette, Committee Member ; Weissburg, Marc, Committee Member ; Sturm, Terry, Committee Member ; Roberts, Phillip, Committee Member ; Webster, Donald R., Committee Chair.

Thesis (Ph. D.)--Illinois State University, 2002. / Title from title page screen, viewed January 31, 2006. Dissertation Committee: Brian J. Wilkinson (chair), Radheshyam K. Jayaswal, Alan J. Katz, Wade A. Nichols, Anthony J. Otsuka. Includes bibliographical references (leaves 144-149) and abstract. Also available in print.

Thesis (Ph. D.)--University of Florida, 2003. / Title from title page of source document. Includes vita. Includes bibliographical references.

Genotype by environment interaction (GxE) is the tendency of the phenotypic performance of two or more plant genotypes in one environment to not be predictive of their relative performance in another environment. To discover the importance of GxE in this region, a large set of USDA and commercial hybrids were tested in the regions of practical significance to sunflower production in order to produce recommendations regarding mega-environments for yield and oil. Rank changes for oil content occurred among hybrids and two common factors accounted for 68.6% of the total GxE variation. Breeding programs testing pre-commercial hybrids in multiple environments for oil content could be beneficial. Yield covariates for lodging, bird damage, and disease were significant but occurred in different locations with variable severity each year making it difficult to divide the growing region into mega-environments for yield.