Investigation of Biotic and Abiotic Factors Affecting Double-Cropped Corn (Zea mays L.) Production in Virginia

dc.contributor.authorSforza, Peter M.en
dc.contributor.committeecochairStromberg, Erik L.en
dc.contributor.committeecochairHagood, Edward Scott Jr.en
dc.contributor.committeememberYoungman, Roger R.en
dc.contributor.committeememberBrann, Daniel E.en
dc.contributor.departmentPlant Pathology, Physiology, and Weed Scienceen
dc.date.accessioned2014-03-14T20:45:24Zen
dc.date.adate2005-10-03en
dc.date.available2014-03-14T20:45:24Zen
dc.date.issued2004-04-30en
dc.date.rdate2006-10-05en
dc.date.sdate2005-09-14en
dc.description.abstractDouble-cropping of corn (Zea mays L.) for grain following the harvest of a small grain crop has been under evaluation in Virginia as an alternative cropping strategy (Brann and Pitman, 1997). To assess the potential constraints on late planted corn imposed by insects and diseases, double-cropped corn was evaluated in field experiments in Montgomery County, Virginia from 1998 to 2000. Factors included two near-isoline hybrids (NK4640 and NK4640Bt), insecticides at planting (tefluthrin in all years, 1998-2000; and imidacloprid in 1999 and 2000), and fungicide treatments (azoxystrobin or propiconazole). Response variables included yield, moisture at harvest, grain test weight, damage by European corn borer (Ostrinia nubilalis), damage by corn earworm (Heliothis zea), disease progress curves for gray leaf spot Cercospora zeae-maydis), and number of plants exhibiting virus symptoms. The Bt hybrid performed significantly better than the non-Bt hybrid for yield and test weight in double-cropped corn in 1998 and 2000, but not in 1999. A spatially referenced site suitability analysis was performed for full season and double-cropped corn in Virginia using weighted abiotic factors and constraints. Thornthwaite potential evapotranspiration (PET) and PET minus precipitation were used to identify areas of the state having a lower average moisture deficit during the silking months for double-cropped corn compared to full-season corn. It is concluded that double-cropped corn production is a viable option in Virginia where abiotic factors are not constraining, particularly growing season length and moisture availability during the sensitive stages of development.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-09142005-104844en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09142005-104844/en
dc.identifier.urihttp://hdl.handle.net/10919/35053en
dc.publisherVirginia Techen
dc.relation.haspart05_Figures.pdfen
dc.relation.haspart08_Site_Suitability.pdfen
dc.relation.haspart06_Literature_Review.pdfen
dc.relation.haspart07_Field_Experiments.pdfen
dc.relation.haspart09_References.pdfen
dc.relation.haspart02_Abstract.pdfen
dc.relation.haspart04_Tables.pdfen
dc.relation.haspart03_Table_of_Contents.pdfen
dc.relation.haspart01_Title_Page.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectBacillus thuringiensisen
dc.subjectgeographic information system (GIS)en
dc.subjectpotential evapotranspirationen
dc.subjectcornen
dc.subjectsoilen
dc.subjectabioticen
dc.subjectbioticen
dc.subjectdouble cropped cornen
dc.subjectZea maysen
dc.subjectEuropean corn boreren
dc.subjectsite suitabilityen
dc.subjectclimateen
dc.subjectOstrinia nubilalisen
dc.subjectVirginiaen
dc.subjectModelingen
dc.titleInvestigation of Biotic and Abiotic Factors Affecting Double-Cropped Corn (Zea mays L.) Production in Virginiaen
dc.typeThesisen
thesis.degree.disciplinePlant Pathology, Physiology, and Weed Scienceen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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