{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/31860"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/31860","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Soil-Specific, Late-Season Nitrogen and Potassium Applications to Increase Corn Yields in the Mid-Atlantic Coastal Plain","abstract":"Corn grain yields can be limited by nitrogen (N) and potassium (K) availability on sandy coastal plain soils when soil moisture is adequate for high yields. This study evaluated irrigated corn grain yield response to late-season (just prior to tassel) N and K fertilizer applications, and enabled the proposal of a method to predict potential for corn to utilize late-season N applications based on soil moisture. In an experiment to evaluate late-season fertilizer application rates, N and K were applied in a complete factorial of five N and K rates ranging from 0 to 112 kg ha-1. Additionally, water use of high yielding corn was measured, and historical weather patterns evaluated in an effort to predict the need for late-season fertilizer applications based on soil moisture. Grain yield was increased significantly by late-season N applications in three of four experiments. Potassium applications did not affect yield, and there were no interactions between N and K. Significant drainage due to high rainfall levels in 2000 prohibited further refinement of corn water use data for Virginia climatic conditions. Historical weather patterns, potential evapotranspiration of corn, and soil water holding properties were evaluated. In order to provide corn with adequate moisture during a two-week moisture-sensitive critical period beginning at tassel, soils must be near field capacity at the start of the period and receive above-average (75th percentile) rainfall during the period.","abstract_html":"Corn grain yields can be limited by nitrogen (N) and potassium (K) availability on sandy coastal plain soils when soil moisture is adequate for high yields. This study evaluated irrigated corn grain yield response to late-season (just prior to tassel) N and K fertilizer applications, and enabled the proposal of a method to predict potential for corn to utilize late-season N applications based on soil moisture. In an experiment to evaluate late-season fertilizer application rates, N and K were applied in a complete factorial of five N and K rates ranging from 0 to 112 kg ha-1. Additionally, water use of high yielding corn was measured, and historical weather patterns evaluated in an effort to predict the need for late-season fertilizer applications based on soil moisture. Grain yield was increased significantly by late-season N applications in three of four experiments. Potassium applications did not affect yield, and there were no interactions between N and K. Significant drainage due to high rainfall levels in 2000 prohibited further refinement of corn water use data for Virginia climatic conditions. Historical weather patterns, potential evapotranspiration of corn, and soil water holding properties were evaluated. In order to provide corn with adequate moisture during a two-week moisture-sensitive critical period beginning at tassel, soils must be near field capacity at the start of the period and receive above-average (75th percentile) rainfall during the period.","abstract_has_math":false,"creators":["Lewis, Matthew A."],"institution":"Virginia Tech","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Crop and Soil Environmental Sciences","degree_department":"Crop and Soil Environmental Sciences","school":null,"contributors":[],"advisors":[],"committee_chairs":["Alley, Marcus M."],"committee_members":["Mullins, Gregory L.","Brann, Daniel E."],"year":2001,"date_issued":"2001-04-13","date_published":"2001-04-13","updated_at":"2026-07-22T22:19:04Z","subjects":["Nitrogen","Corn","Zea mays L.","Available Water","Potassium"],"languages":[],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-04242001-104913"],"render_values":[{"text":"etd-04242001-104913","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10919/31860","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.committeechair","label":"Committee Chair","values":["Alley, Marcus M."]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Mullins, Gregory L.","Brann, Daniel E."]},{"key":"dc:contributor.department","label":"Department","values":["Crop and Soil Environmental Sciences"]},{"key":"dc:creator","label":"Author","values":["Lewis, Matthew A."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2014-03-14T20:34:07Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2014-03-14T20:34:07Z","2002-04-24"]},{"key":"dc:date.issued","label":"Date","values":["2001-04-13"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Tech"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Crop and Soil Environmental Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Nitrogen","Corn","Zea mays L.","Available Water","Potassium"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-04242001-104913"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/31860"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Corn grain yields can be limited by nitrogen (N) and potassium (K) availability on sandy coastal plain soils when soil moisture is adequate for high yields. This study evaluated irrigated corn grain yield response to late-season (just prior to tassel) N and K fertilizer applications, and enabled the proposal of a method to predict potential for corn to utilize late-season N applications based on soil moisture. In an experiment to evaluate late-season fertilizer application rates, N and K were applied in a complete factorial of five N and K rates ranging from 0 to 112 kg ha-1. Additionally, water use of high yielding corn was measured, and historical weather patterns evaluated in an effort to predict the need for late-season fertilizer applications based on soil moisture. Grain yield was increased significantly by late-season N applications in three of four experiments. Potassium applications did not affect yield, and there were no interactions between N and K. Significant drainage due to high rainfall levels in 2000 prohibited further refinement of corn water use data for Virginia climatic conditions. Historical weather patterns, potential evapotranspiration of corn, and soil water holding properties were evaluated. In order to provide corn with adequate moisture during a two-week moisture-sensitive critical period beginning at tassel, soils must be near field capacity at the start of the period and receive above-average (75th percentile) rainfall during the period."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:title","label":"Title","values":["Soil-Specific, Late-Season Nitrogen and Potassium Applications to Increase Corn Yields in the Mid-Atlantic Coastal Plain"]}]}],"canonical_facts":{"dc:contributor.committeechair":["Alley, Marcus M."],"dc:contributor.committeemember":["Mullins, Gregory L.","Brann, Daniel E."],"dc:contributor.department":["Crop and Soil Environmental Sciences"],"dc:creator":["Lewis, Matthew A."],"dc:date.accessioned":["2014-03-14T20:34:07Z"],"dc:date.available":["2014-03-14T20:34:07Z","2002-04-24"],"dc:date.issued":["2001-04-13"],"dc:description.abstract":["Corn grain yields can be limited by nitrogen (N) and potassium (K) availability on sandy coastal plain soils when soil moisture is adequate for high yields. This study evaluated irrigated corn grain yield response to late-season (just prior to tassel) N and K fertilizer applications, and enabled the proposal of a method to predict potential for corn to utilize late-season N applications based on soil moisture. In an experiment to evaluate late-season fertilizer application rates, N and K were applied in a complete factorial of five N and K rates ranging from 0 to 112 kg ha-1. Additionally, water use of high yielding corn was measured, and historical weather patterns evaluated in an effort to predict the need for late-season fertilizer applications based on soil moisture. Grain yield was increased significantly by late-season N applications in three of four experiments. Potassium applications did not affect yield, and there were no interactions between N and K. Significant drainage due to high rainfall levels in 2000 prohibited further refinement of corn water use data for Virginia climatic conditions. Historical weather patterns, potential evapotranspiration of corn, and soil water holding properties were evaluated. In order to provide corn with adequate moisture during a two-week moisture-sensitive critical period beginning at tassel, soils must be near field capacity at the start of the period and receive above-average (75th percentile) rainfall during the period."],"dc:description.degree":["Master of Science"],"dc:identifier.other":["etd-04242001-104913"],"dc:identifier.uri":["http://hdl.handle.net/10919/31860"],"dc:publisher":["Virginia Tech"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:subject":["Nitrogen","Corn","Zea mays L.","Available Water","Potassium"],"dc:title":["Soil-Specific, Late-Season Nitrogen and Potassium Applications to Increase Corn Yields in the Mid-Atlantic Coastal Plain"],"dc:type":["Thesis"],"thesis:degree_discipline":["Crop and Soil Environmental Sciences"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Polytechnic Institute and State University"]},"updated_at":"2026-07-22T22:19:04Z"}