{"id":{"repo_id":"guelph","oai_identifier":"oai:atrium.lib.uoguelph.ca:10214/28598"},"canonical_url":"https://search.dev.ndltd.org/etd/guelph/oai:atrium.lib.uoguelph.ca:10214/28598","repository":{"repo_id":"guelph","name":"University of Guelph","base_url":"https://atrium.lib.uoguelph.ca/server/oai/request"},"display":{"title":"An Improved Understanding Of Phosphorus Dynamics And Fertility Management In Forage Production Systems","abstract":"Forage fertility recommendations have not changed since the 1980s, and anecdotal evidence suggests producers often apply less than provincially recommended rates. A better understanding of forage fertility, especially phosphorus (P), is crucial to optimize profit and reduce environmental nutrient losses. This thesis explores how forage fertility affects productivity in two scenarios. First, a 14-week controlled environment study with Italian ryegrass (Lolium multiflorum) tested crop response to P addition in soils with different soil organic carbon (SOC) and agriculture land use histories. Crop yield was influenced by soil type and P supply rate (determined using anion exchange probes), but not by soil test P (Olsen P), suggesting SOC and phosphatase activities also impact P supply. In addition, a three-year field trial compared provincial soil test recommendations with light nutrient application (112 kg ha⁻¹ of 19-19-19 NPK fertilizer) across 19 forage types. Profitability increased with fertilization only in mixed grass-legume stands due to high nitrogen costs for grass-only stands. The overall findings highlight the importance of soil properties (e.g., SOC, enzymatic activity) and soil testing in increasing fertilizer use efficiency.","abstract_html":"Forage fertility recommendations have not changed since the 1980s, and anecdotal evidence suggests producers often apply less than provincially recommended rates. A better understanding of forage fertility, especially phosphorus (P), is crucial to optimize profit and reduce environmental nutrient losses. This thesis explores how forage fertility affects productivity in two scenarios. First, a 14-week controlled environment study with Italian ryegrass (Lolium multiflorum) tested crop response to P addition in soils with different soil organic carbon (SOC) and agriculture land use histories. Crop yield was influenced by soil type and P supply rate (determined using anion exchange probes), but not by soil test P (Olsen P), suggesting SOC and phosphatase activities also impact P supply. In addition, a three-year field trial compared provincial soil test recommendations with light nutrient application (112 kg ha⁻¹ of 19-19-19 NPK fertilizer) across 19 forage types. Profitability increased with fertilization only in mixed grass-legume stands due to high nitrogen costs for grass-only stands. The overall findings highlight the importance of soil properties (e.g., SOC, enzymatic activity) and soil testing in increasing fertilizer use efficiency.","abstract_has_math":false,"creators":["Lamichhane, Puja"],"institution":"University of Guelph","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Schneider, Kimberley"],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-08-21T16:45:07Z","subjects":["Phosphorus","Soil organic matter","Forage fertility"],"languages":["en"],"rights":["Attribution-NonCommercial-NoDerivatives 4.0 International"],"rights_urls":["http://creativecommons.org/licenses/by-nc-nd/4.0/"],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/10214/28598","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"source_record":{"url":"https://atrium.lib.uoguelph.ca/server/oai/request?verb=GetRecord&metadataPrefix=dim&identifier=oai%3Aatrium.lib.uoguelph.ca%3A10214%2F28598","prefix":"dim"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Schneider, Kimberley"]},{"key":"dc:creator","label":"Author","values":["Lamichhane, Puja"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2024-09-11T20:14:13Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2024-09-11T20:14:13Z"]},{"key":"dc:publisher","label":"Institution","values":["University of Guelph"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Phosphorus","Soil organic matter","Forage fertility"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Attribution-NonCommercial-NoDerivatives 4.0 International"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://creativecommons.org/licenses/by-nc-nd/4.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/10214/28598"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Related dataset: Lamichhane, Puja; Schneider, Kimberley, 2024, \"Supplemental data for: An improved understanding of phosphorus dynamics and fertility management in forage production systems\", https://doi.org/10.5683/SP3/KMIK6Z, Borealis, V1"]},{"key":"dc:description.abstract","label":"Abstract","values":["Forage fertility recommendations have not changed since the 1980s, and anecdotal evidence suggests producers often apply less than provincially recommended rates. A better understanding of forage fertility, especially phosphorus (P), is crucial to optimize profit and reduce environmental nutrient losses. This thesis explores how forage fertility affects productivity in two scenarios. First, a 14-week controlled environment study with Italian ryegrass (Lolium multiflorum) tested crop response to P addition in soils with different soil organic carbon (SOC) and agriculture land use histories. Crop yield was influenced by soil type and P supply rate (determined using anion exchange probes), but not by soil test P (Olsen P), suggesting SOC and phosphatase activities also impact P supply. In addition, a three-year field trial compared provincial soil test recommendations with light nutrient application (112 kg ha⁻¹ of 19-19-19 NPK fertilizer) across 19 forage types. Profitability increased with fertilization only in mixed grass-legume stands due to high nitrogen costs for grass-only stands. The overall findings highlight the importance of soil properties (e.g., SOC, enzymatic activity) and soil testing in increasing fertilizer use efficiency."]},{"key":"dc:title","label":"Title","values":["An Improved Understanding Of Phosphorus Dynamics And Fertility Management In Forage Production Systems"]}]}],"canonical_facts":{"dc:contributor.advisor":["Schneider, Kimberley"],"dc:creator":["Lamichhane, Puja"],"dc:date.accessioned":["2024-09-11T20:14:13Z"],"dc:date.available":["2024-09-11T20:14:13Z"],"dc:description":["Related dataset: Lamichhane, Puja; Schneider, Kimberley, 2024, \"Supplemental data for: An improved understanding of phosphorus dynamics and fertility management in forage production systems\", https://doi.org/10.5683/SP3/KMIK6Z, Borealis, V1"],"dc:description.abstract":["Forage fertility recommendations have not changed since the 1980s, and anecdotal evidence suggests producers often apply less than provincially recommended rates. A better understanding of forage fertility, especially phosphorus (P), is crucial to optimize profit and reduce environmental nutrient losses. This thesis explores how forage fertility affects productivity in two scenarios. First, a 14-week controlled environment study with Italian ryegrass (Lolium multiflorum) tested crop response to P addition in soils with different soil organic carbon (SOC) and agriculture land use histories. Crop yield was influenced by soil type and P supply rate (determined using anion exchange probes), but not by soil test P (Olsen P), suggesting SOC and phosphatase activities also impact P supply. In addition, a three-year field trial compared provincial soil test recommendations with light nutrient application (112 kg ha⁻¹ of 19-19-19 NPK fertilizer) across 19 forage types. Profitability increased with fertilization only in mixed grass-legume stands due to high nitrogen costs for grass-only stands. The overall findings highlight the importance of soil properties (e.g., SOC, enzymatic activity) and soil testing in increasing fertilizer use efficiency."],"dc:identifier.uri":["https://hdl.handle.net/10214/28598"],"dc:language.iso":["en"],"dc:publisher":["University of Guelph"],"dc:rights":["Attribution-NonCommercial-NoDerivatives 4.0 International"],"dc:rights.uri":["http://creativecommons.org/licenses/by-nc-nd/4.0/"],"dc:subject":["Phosphorus","Soil organic matter","Forage fertility"],"dc:title":["An Improved Understanding Of Phosphorus Dynamics And Fertility Management In Forage Production Systems"],"dc:type":["Thesis"]},"updated_at":"2026-08-21T16:45:07Z"}