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dc.contributor.authorFreeborn, John R.en_US
dc.date.accessioned2014-03-14T20:35:03Z
dc.date.available2014-03-14T20:35:03Z
dc.date.issued2000-04-26en_US
dc.identifier.otheretd-05052000-15080051en_US
dc.identifier.urihttp://hdl.handle.net/10919/32204
dc.description.abstractThe yield response of soybean [Glycine max (L.) Merr.] to reproductive stage applications of either nitrogen (N) or boron (B) has been inconsistent. This study evaluated soybean seed yield response to foliar applications of B and soil applications of N at two stages of plant development, at two row spacings, at four irrigation levels, and on three cultivars over three years. Planting dates were either mid-May or mid-June, except the year two of the irrigated soil moisture experiment which had a second planting date of early July. In an experiment to evaluate B rate and timing, B was applied at four rates from 0 to 0.56 kg ha-1 at the R3 or R5 development stage. In an experiment to evaluate N rate and timing, N was applied at seven rates from 0 to 168 kg ha-1 at either the R3 or R5 development stage. A third experiment to evaluate row spacing and cultivar effects on N and B had four treatments: 0 N and 0 B; 56 kg ha -1 N, and 0 B; 0 N and 0.28 kg ha-1 B; and finally 56 kg ha-1 N and 0.28 kg ha-1 B. Treatments were applied to three soybean cultivars planted in either 23 or 46 cm row spacings. The above experiments were irrigated to evaluate treatments at high yield levels. To further evaluate the effect of soil moisture, the same four N and B combinations were applied to soybeans irrigated via a sub-surface micro-drip irrigation system delivering four irrigation regimes: 0%, 33%, 66%, or 100% of plant required water. Gradients were established in year one of this experiment, but late season rains eliminated gradients, and high rainfall in the second year disallowed gradient establishment. Applications of N or B had no effect on seed yields in any experiment, or at any moisture level. In the row spacing and cultivar experiment, there were significant effects of varieties, and a significant interaction between row spacing and variety in two of the three years.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartThesisFreeborn.pdfen_US
dc.rightsI hereby grant to Virginia Tech or its agents the right to archive and to make available my thesis or dissertation in whole or in part in the University Libraries in all forms of media, now or hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation.en_US
dc.subjectBoronen_US
dc.subjectGlycine max L. Merren_US
dc.subjectReproductive Stageen_US
dc.subjectSoybeanen_US
dc.subjectNitrogenen_US
dc.titleNitrogen and Boron Applications During Reproductive Stages for Soybean Yield Enhancementen_US
dc.typeThesisen_US
dc.contributor.departmentCrop and Soil Environmental Sciencesen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineCrop and Soil Environmental Sciencesen_US
dc.contributor.committeechairHolshouser, David L.en_US
dc.contributor.committeememberOrcutt, David M.en_US
dc.contributor.committeememberPowell, Norris L.en_US
dc.contributor.committeememberAlley, Marcus M.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05052000-15080051/en_US
dc.date.sdate2000-05-05en_US
dc.date.rdate2001-05-08
dc.date.adate2000-05-08en_US


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