{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/97447"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/97447","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The use of fertilizer nitrogen applications to increase productivity of soybean","abstract":"For optimal productivity, soybean [Glycine max (L.) Merr.] may require fertilizer nitrogen (N) to supplement biological N fixation. The objective of this study was to identify the best fertilizer source and the best plant growth stage for N applications to increase soybean yield using N fertilization. Trials were established at three locations in Illinois during three consecutive years for a total of nine site-years. In 2014, five different N sources were supplied and in 2015 and 2016, seven different N sources were supplied at one of four different soybean growth stages (preplant, V3, R1, and R3) at an application rate of 112 kg N ha-1 (100 lb N ac-1). The seven different N sources evaluated were: ammonium nitrate (AN, 34-0-0), ammonium sulfate (21-0-0-24S), ESN (environmentally-smart nitrogen, 44-0-0), urea + Limus (urea treated with the urease inhibitor Limus, 46-0-0), liquid urea-ammonium nitrate (UAN, 28-0-0), urea (46-0-0), and a mixture of ammonium nitrate, potassium nitrate, and ammonium sulfate (30-0-7-2S), along with an unfertilized control. When averaged across all locations, significant increases in yield occurred when N was supplied during the early growth stages (preplant and V3) in 2014 and 2016. While in 2015, significant increases in yield were more apparent from N applications during the reproductive growth stages (R1 and R3). Fertilizing with AN or ESN at preplant produced the most consistent yield increases over the nine site-years. However, when examining the individual locations, variation in N source and the application time that gave the greatest yield increase was evident, suggesting that yield increases are dependent upon a given location, N source, and/or application time.","abstract_html":"For optimal productivity, soybean [Glycine max (L.) Merr.] may require fertilizer nitrogen (N) to supplement biological N fixation. The objective of this study was to identify the best fertilizer source and the best plant growth stage for N applications to increase soybean yield using N fertilization. Trials were established at three locations in Illinois during three consecutive years for a total of nine site-years. In 2014, five different N sources were supplied and in 2015 and 2016, seven different N sources were supplied at one of four different soybean growth stages (preplant, V3, R1, and R3) at an application rate of 112 kg N ha-1 (100 lb N ac-1). The seven different N sources evaluated were: ammonium nitrate (AN, 34-0-0), ammonium sulfate (21-0-0-24S), ESN (environmentally-smart nitrogen, 44-0-0), urea + Limus (urea treated with the urease inhibitor Limus, 46-0-0), liquid urea-ammonium nitrate (UAN, 28-0-0), urea (46-0-0), and a mixture of ammonium nitrate, potassium nitrate, and ammonium sulfate (30-0-7-2S), along with an unfertilized control. When averaged across all locations, significant increases in yield occurred when N was supplied during the early growth stages (preplant and V3) in 2014 and 2016. While in 2015, significant increases in yield were more apparent from N applications during the reproductive growth stages (R1 and R3). Fertilizing with AN or ESN at preplant produced the most consistent yield increases over the nine site-years. However, when examining the individual locations, variation in N source and the application time that gave the greatest yield increase was evident, suggesting that yield increases are dependent upon a given location, N source, and/or application time.","abstract_has_math":false,"creators":["Mann, Shelby Melissa"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Crop Sciences","degree_department":null,"school":null,"contributors":["Below, Frederick E.","HUber, Steve","Mulvaney, Richard"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-08-10T19:15:58Z","date_published":"2017-08-10T19:15:58Z","updated_at":"2026-07-22T22:24:34Z","subjects":["Soybean","Nitrogen"],"languages":["en"],"rights":["Copyright 2017 Shelby Mann"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/97447","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Below, Frederick E.","HUber, Steve","Mulvaney, Richard"]},{"key":"dc:creator","label":"Author","values":["Mann, Shelby Melissa"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-08-10T19:15:58Z","2017-04-27","2017-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Crop Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Soybean","Nitrogen"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2017 Shelby Mann"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/97447"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["For optimal productivity, soybean [Glycine max (L.) Merr.] may require fertilizer nitrogen (N) to supplement biological N fixation. The objective of this study was to identify the best fertilizer source and the best plant growth stage for N applications to increase soybean yield using N fertilization. Trials were established at three locations in Illinois during three consecutive years for a total of nine site-years. In 2014, five different N sources were supplied and in 2015 and 2016, seven different N sources were supplied at one of four different soybean growth stages (preplant, V3, R1, and R3) at an application rate of 112 kg N ha-1 (100 lb N ac-1). The seven different N sources evaluated were: ammonium nitrate (AN, 34-0-0), ammonium sulfate (21-0-0-24S), ESN (environmentally-smart nitrogen, 44-0-0), urea + Limus (urea treated with the urease inhibitor Limus, 46-0-0), liquid urea-ammonium nitrate (UAN, 28-0-0), urea (46-0-0), and a mixture of ammonium nitrate, potassium nitrate, and ammonium sulfate (30-0-7-2S), along with an unfertilized control. When averaged across all locations, significant increases in yield occurred when N was supplied during the early growth stages (preplant and V3) in 2014 and 2016. While in 2015, significant increases in yield were more apparent from N applications during the reproductive growth stages (R1 and R3). Fertilizing with AN or ESN at preplant produced the most consistent yield increases over the nine site-years. However, when examining the individual locations, variation in N source and the application time that gave the greatest yield increase was evident, suggesting that yield increases are dependent upon a given location, N source, and/or application time.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-08-10 without embargo terms","The student, Shelby Mann, accepted the attached license on 2017-04-23 at 18:37.","The student, Shelby Mann, submitted this Thesis for approval on 2017-04-23 at 18:44.","This Thesis was approved for publication on 2017-04-27 at 16:30.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11000 on 2017-08-10 at 13:45:34","Made available in DSpace on 2017-08-10T19:15:58Z (GMT). No. of bitstreams: 2 MANN-THESIS-2017.pdf: 551001 bytes, checksum: 477690bf160758d8de260ee29d9d4d34 (MD5) LICENSE.txt: 4208 bytes, checksum: 6dc7b050e3a50739177beefe6fc967f7 (MD5) Previous issue date: 2017-04-27"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["The use of fertilizer nitrogen applications to increase productivity of soybean"]}]}],"canonical_facts":{"dc:contributor":["Below, Frederick E.","HUber, Steve","Mulvaney, Richard"],"dc:creator":["Mann, Shelby Melissa"],"dc:date":["2017-08-10T19:15:58Z","2017-04-27","2017-05"],"dc:description":["For optimal productivity, soybean [Glycine max (L.) Merr.] may require fertilizer nitrogen (N) to supplement biological N fixation. The objective of this study was to identify the best fertilizer source and the best plant growth stage for N applications to increase soybean yield using N fertilization. Trials were established at three locations in Illinois during three consecutive years for a total of nine site-years. In 2014, five different N sources were supplied and in 2015 and 2016, seven different N sources were supplied at one of four different soybean growth stages (preplant, V3, R1, and R3) at an application rate of 112 kg N ha-1 (100 lb N ac-1). The seven different N sources evaluated were: ammonium nitrate (AN, 34-0-0), ammonium sulfate (21-0-0-24S), ESN (environmentally-smart nitrogen, 44-0-0), urea + Limus (urea treated with the urease inhibitor Limus, 46-0-0), liquid urea-ammonium nitrate (UAN, 28-0-0), urea (46-0-0), and a mixture of ammonium nitrate, potassium nitrate, and ammonium sulfate (30-0-7-2S), along with an unfertilized control. When averaged across all locations, significant increases in yield occurred when N was supplied during the early growth stages (preplant and V3) in 2014 and 2016. While in 2015, significant increases in yield were more apparent from N applications during the reproductive growth stages (R1 and R3). Fertilizing with AN or ESN at preplant produced the most consistent yield increases over the nine site-years. However, when examining the individual locations, variation in N source and the application time that gave the greatest yield increase was evident, suggesting that yield increases are dependent upon a given location, N source, and/or application time.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-08-10 without embargo terms","The student, Shelby Mann, accepted the attached license on 2017-04-23 at 18:37.","The student, Shelby Mann, submitted this Thesis for approval on 2017-04-23 at 18:44.","This Thesis was approved for publication on 2017-04-27 at 16:30.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11000 on 2017-08-10 at 13:45:34","Made available in DSpace on 2017-08-10T19:15:58Z (GMT). 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