Energetics of low-input corn production

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dc.contributor.authorEss, Daniel R.en
dc.contributor.committeechairVaughan, David H.en
dc.contributor.committeememberCundiff, John S.en
dc.contributor.committeememberLuna, John M.en
dc.contributor.committeememberPerumpral, John V.en
dc.contributor.departmentAgricultural Engineeringen
dc.date.accessioned2014-03-14T21:37:11Zen
dc.date.adate2009-06-08en
dc.date.available2014-03-14T21:37:11Zen
dc.date.issued1990-12-05en
dc.date.rdate2009-06-08en
dc.date.sdate2009-06-08en
dc.description.abstractThis study compares the energy costs of synthesizing, distributing, and applying manufactured nitrogen fertilizer to the overall energy costs associated with nitrogen-fixing legume production and use. The energetics of com silage and com grain production under standard and alternative practices are examined. Economic analyses of crop production practices are used to aid the selection of recommended alternative practices. In corn silage production, cover-cropped treatments had a significant advantage over standard practice treatments in terms of overall energy expenditures for field operations. Cover-cropped no-till treatments required an average energy expenditure of 9026 MJ/ha compared to 19,763 MJ/ha required by the standard-practice no-till treatment. Cover-cropped treatments that used disking to kill the cover crops required an average energy expenditure of 9781 MJ/ha compared to 18,488 MJ /ha required by the standard-practice winter-fallow treatment. Alternative-practice treatments that utilized vetches to provide nitrogen for com production performed significantly better than standard-practice treatments in terms of energy use per unit of crop output. In addition, the alternative hairy vetch - no-till treatment produced a $33/ha greater average net revenue than the standard-practice no-till treatment. Weed control energy requirements for cover-cropped ridge-tillage com grain production were compared. Broadcast application of pre-emergence herbicides required an energy expenditure of 1160 MJ fha. Cultivation of ridges to control weeds consumed 380 MJ/ha. Economic costs of ridge cultivation were $14/ha. Broadcast application of pre-emergence herbicides cost $49/ha.en
dc.description.degreeMaster of Scienceen
dc.format.extentix, 187 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06082009-171129en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06082009-171129/en
dc.identifier.urihttp://hdl.handle.net/10919/42915en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1990.E877.pdfen
dc.relation.isformatofOCLC# 23745923en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1990.E877en
dc.subject.lcshCornen
dc.subject.lcshCover cropsen
dc.subject.lcshCropping systemsen
dc.subject.lcshLegumesen
dc.titleEnergetics of low-input corn productionen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineAgricultural Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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