{"id":{"repo_id":"umn","oai_identifier":"oai:conservancy.umn.edu:11299/104614"},"canonical_url":"https://search.dev.ndltd.org/etd/umn/oai:conservancy.umn.edu:11299/104614","repository":{"repo_id":"umn","name":"University of Minnesota","base_url":"https://conservancy.umn.edu/server/oai/request"},"display":{"title":"Direct and indirect nitrous oxide emissions from controlled release and conventional fertilizers applied to potatoes in coarse textures soil.","abstract":"Irrigated potato (Solanum tuberosum L.) production requires significant inputs of fertilizer N for optimal tuber yield and quality. However, high N rates carry the risk of high N loss, particularly in coarse-textured, well-drained soils where potatoes are commonly grown. Polymer coated controlled-release ureas (PCU) have shown promise in reducing NO3 - leaching, a groundwater quality concern, and may potentially also reduce emissions of N2O, a greenhouse gas with nearly 300 times the warming potential of carbon dioxide. However, comparisons of multiple PCUs are uncommon. Studies were conducted over three years to compare N loss (as NO3 - and N2O), yield response, and N use efficiency (NUE) from an unfertilized control, split applied conventional N fertilizer (CSA), and two PCU products (PCU-1 and PCU-2) applied at 270 kg N ha-1 yr-1. Tuber yields, NUE, and leaching did not differ among fertilized treatments. Directly measured N2O emissions were significantly lower with PCU-1 than CSA. Fertilizer induced emissions were relatively low, ranging from 0.10 to 0.49% of applied N. Indirect N2O emissions, estimated using the IPCC default emission factor of 0.75% of NO3 - leached, were significantly lower than direct emissions. However, due to uncertainty, indirect emissions could be anywhere from 0.6 to 84.9% of direct. These results show that PCU can potentially reduce N2O emissions. However, results are product specific and work remains to be done in narrowing the indirect emission factor uncertainty range.","abstract_html":"Irrigated potato (Solanum tuberosum L.) production requires significant inputs of fertilizer N for optimal tuber yield and quality. However, high N rates carry the risk of high N loss, particularly in coarse-textured, well-drained soils where potatoes are commonly grown. Polymer coated controlled-release ureas (PCU) have shown promise in reducing NO3 - leaching, a groundwater quality concern, and may potentially also reduce emissions of N2O, a greenhouse gas with nearly 300 times the warming potential of carbon dioxide. However, comparisons of multiple PCUs are uncommon. Studies were conducted over three years to compare N loss (as NO3 - and N2O), yield response, and N use efficiency (NUE) from an unfertilized control, split applied conventional N fertilizer (CSA), and two PCU products (PCU-1 and PCU-2) applied at 270 kg N ha-1 yr-1. Tuber yields, NUE, and leaching did not differ among fertilized treatments. Directly measured N2O emissions were significantly lower with PCU-1 than CSA. Fertilizer induced emissions were relatively low, ranging from 0.10 to 0.49% of applied N. Indirect N2O emissions, estimated using the IPCC default emission factor of 0.75% of NO3 - leached, were significantly lower than direct emissions. However, due to uncertainty, indirect emissions could be anywhere from 0.6 to 84.9% of direct. These results show that PCU can potentially reduce N2O emissions. However, results are product specific and work remains to be done in narrowing the indirect emission factor uncertainty range.","abstract_has_math":false,"creators":["Hyatt, Charles R."],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-04","date_published":"2011-04","updated_at":"2026-07-24T05:19:42Z","subjects":["Plant Biology"],"languages":["en_US"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://purl.umn.edu/104614","outbound_label":"Repository record","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Hyatt, Charles R."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2011-05-19T14:09:56Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2011-05-19T14:09:56Z"]},{"key":"dc:date.issued","label":"Date","values":["2011-04"]},{"key":"dc:type","label":"Dc Type","values":["Thesis or Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Plant Biology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://purl.umn.edu/104614"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["University of Minnesota M.S. thesis. April 2011. Major: Plant Biology. Advisor: Rodney T. Venterea. 1 computer file (PDF); viii, 154 pages."]},{"key":"dc:description.abstract","label":"Abstract","values":["Irrigated potato (Solanum tuberosum L.) production requires significant inputs of fertilizer N for optimal tuber yield and quality. However, high N rates carry the risk of high N loss, particularly in coarse-textured, well-drained soils where potatoes are commonly grown. Polymer coated controlled-release ureas (PCU) have shown promise in reducing NO3 - leaching, a groundwater quality concern, and may potentially also reduce emissions of N2O, a greenhouse gas with nearly 300 times the warming potential of carbon dioxide. However, comparisons of multiple PCUs are uncommon. Studies were conducted over three years to compare N loss (as NO3 - and N2O), yield response, and N use efficiency (NUE) from an unfertilized control, split applied conventional N fertilizer (CSA), and two PCU products (PCU-1 and PCU-2) applied at 270 kg N ha-1 yr-1. Tuber yields, NUE, and leaching did not differ among fertilized treatments. Directly measured N2O emissions were significantly lower with PCU-1 than CSA. Fertilizer induced emissions were relatively low, ranging from 0.10 to 0.49% of applied N. Indirect N2O emissions, estimated using the IPCC default emission factor of 0.75% of NO3 - leached, were significantly lower than direct emissions. However, due to uncertainty, indirect emissions could be anywhere from 0.6 to 84.9% of direct. These results show that PCU can potentially reduce N2O emissions. However, results are product specific and work remains to be done in narrowing the indirect emission factor uncertainty range."]},{"key":"dc:title","label":"Title","values":["Direct and indirect nitrous oxide emissions from controlled release and conventional fertilizers applied to potatoes in coarse textures soil."]}]}],"canonical_facts":{"dc:creator":["Hyatt, Charles R."],"dc:date.accessioned":["2011-05-19T14:09:56Z"],"dc:date.available":["2011-05-19T14:09:56Z"],"dc:date.issued":["2011-04"],"dc:description":["University of Minnesota M.S. thesis. April 2011. Major: Plant Biology. Advisor: Rodney T. Venterea. 1 computer file (PDF); viii, 154 pages."],"dc:description.abstract":["Irrigated potato (Solanum tuberosum L.) production requires significant inputs of fertilizer N for optimal tuber yield and quality. However, high N rates carry the risk of high N loss, particularly in coarse-textured, well-drained soils where potatoes are commonly grown. Polymer coated controlled-release ureas (PCU) have shown promise in reducing NO3 - leaching, a groundwater quality concern, and may potentially also reduce emissions of N2O, a greenhouse gas with nearly 300 times the warming potential of carbon dioxide. However, comparisons of multiple PCUs are uncommon. Studies were conducted over three years to compare N loss (as NO3 - and N2O), yield response, and N use efficiency (NUE) from an unfertilized control, split applied conventional N fertilizer (CSA), and two PCU products (PCU-1 and PCU-2) applied at 270 kg N ha-1 yr-1. Tuber yields, NUE, and leaching did not differ among fertilized treatments. Directly measured N2O emissions were significantly lower with PCU-1 than CSA. Fertilizer induced emissions were relatively low, ranging from 0.10 to 0.49% of applied N. Indirect N2O emissions, estimated using the IPCC default emission factor of 0.75% of NO3 - leached, were significantly lower than direct emissions. However, due to uncertainty, indirect emissions could be anywhere from 0.6 to 84.9% of direct. These results show that PCU can potentially reduce N2O emissions. However, results are product specific and work remains to be done in narrowing the indirect emission factor uncertainty range."],"dc:identifier.uri":["http://purl.umn.edu/104614"],"dc:language.iso":["en_US"],"dc:subject":["Plant Biology"],"dc:title":["Direct and indirect nitrous oxide emissions from controlled release and conventional fertilizers applied to potatoes in coarse textures soil."],"dc:type":["Thesis or Dissertation"]},"updated_at":"2026-07-24T05:19:42Z"}