{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/85036"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/85036","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Value of Cultural Practices for Improving Nitrogen Management in Corn","abstract":"Production and profitability of corn (Zea mays L.) is highly dependent on fertilizer nitrogen (N) use. The efficiency of fertilizer N use and the capacity of the soil to supply N are the two main components determining the corn N requirement. The cropping management system can also affect N use efficiency and soil N supply. A better understanding of the impact of management practices on corn N requirements is needed due to high N costs and increasing environmental scrutiny over fertilizer N use. The overall objective of this work was to characterize how cultural practices influence corn N requirements, and to develop strategies to adjust for any differences. The approach was to vary the N supply using different management practices over multiple sites and years. Practices evaluated included time of N application, degree of tillage, and varying levels of corn rootworm (Diabrotica spp.) larval damage. Results showed that management practices such as reduced tillage and/or fall or winter applied N can have a greater N requirement compared with more conventional production methods. The economic return to fertilizer N increased with increasing root injury and with decreasing tillage. Fall and winter N applications can cause large yield losses when compared to spring, however these losses can be predicted with spring rainfall and corrected with in-season N based on predicted loss. Management practices that increase the economic response to N, such as reduced tillage and increased root injury, have a greater likelihood of causing N stress and lower yield when other management practices, or environmental conditions decrease the availability of N.","abstract_html":"Production and profitability of corn (Zea mays L.) is highly dependent on fertilizer nitrogen (N) use. The efficiency of fertilizer N use and the capacity of the soil to supply N are the two main components determining the corn N requirement. The cropping management system can also affect N use efficiency and soil N supply. A better understanding of the impact of management practices on corn N requirements is needed due to high N costs and increasing environmental scrutiny over fertilizer N use. The overall objective of this work was to characterize how cultural practices influence corn N requirements, and to develop strategies to adjust for any differences. The approach was to vary the N supply using different management practices over multiple sites and years. Practices evaluated included time of N application, degree of tillage, and varying levels of corn rootworm (Diabrotica spp.) larval damage. Results showed that management practices such as reduced tillage and/or fall or winter applied N can have a greater N requirement compared with more conventional production methods. The economic return to fertilizer N increased with increasing root injury and with decreasing tillage. Fall and winter N applications can cause large yield losses when compared to spring, however these losses can be predicted with spring rainfall and corrected with in-season N based on predicted loss. Management practices that increase the economic response to N, such as reduced tillage and increased root injury, have a greater likelihood of causing N stress and lower yield when other management practices, or environmental conditions decrease the availability of N.","abstract_has_math":false,"creators":["Wessel, Jeffrey Ronald"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Crop Sciences","degree_department":null,"school":null,"contributors":["Fred E. Below"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T22:33:32Z","date_published":"2015-09-25T22:33:32Z","updated_at":"2026-07-22T22:26:24Z","subjects":["Agriculture, Agronomy"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3301247"],"render_values":[{"text":"(MiAaPQ)AAI3301247","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/85036","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Fred E. 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The efficiency of fertilizer N use and the capacity of the soil to supply N are the two main components determining the corn N requirement. The cropping management system can also affect N use efficiency and soil N supply. A better understanding of the impact of management practices on corn N requirements is needed due to high N costs and increasing environmental scrutiny over fertilizer N use. The overall objective of this work was to characterize how cultural practices influence corn N requirements, and to develop strategies to adjust for any differences. The approach was to vary the N supply using different management practices over multiple sites and years. Practices evaluated included time of N application, degree of tillage, and varying levels of corn rootworm (Diabrotica spp.) larval damage. Results showed that management practices such as reduced tillage and/or fall or winter applied N can have a greater N requirement compared with more conventional production methods. The economic return to fertilizer N increased with increasing root injury and with decreasing tillage. Fall and winter N applications can cause large yield losses when compared to spring, however these losses can be predicted with spring rainfall and corrected with in-season N based on predicted loss. Management practices that increase the economic response to N, such as reduced tillage and increased root injury, have a greater likelihood of causing N stress and lower yield when other management practices, or environmental conditions decrease the availability of N.","Made available in DSpace on 2015-09-25T22:33:32Z (GMT). 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The efficiency of fertilizer N use and the capacity of the soil to supply N are the two main components determining the corn N requirement. The cropping management system can also affect N use efficiency and soil N supply. A better understanding of the impact of management practices on corn N requirements is needed due to high N costs and increasing environmental scrutiny over fertilizer N use. The overall objective of this work was to characterize how cultural practices influence corn N requirements, and to develop strategies to adjust for any differences. The approach was to vary the N supply using different management practices over multiple sites and years. Practices evaluated included time of N application, degree of tillage, and varying levels of corn rootworm (Diabrotica spp.) larval damage. Results showed that management practices such as reduced tillage and/or fall or winter applied N can have a greater N requirement compared with more conventional production methods. The economic return to fertilizer N increased with increasing root injury and with decreasing tillage. Fall and winter N applications can cause large yield losses when compared to spring, however these losses can be predicted with spring rainfall and corrected with in-season N based on predicted loss. Management practices that increase the economic response to N, such as reduced tillage and increased root injury, have a greater likelihood of causing N stress and lower yield when other management practices, or environmental conditions decrease the availability of N.","Made available in DSpace on 2015-09-25T22:33:32Z (GMT). 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