000000201 001__ 201
000000201 005__ 20260410124444.0
000000201 0247_ $$2DOI$$a10.6083/M4125QK1
000000201 037__ $$aETD
000000201 245__ $$aCool season mineralization of recalcitrant organic nitrogen in manured soils
000000201 260__ $$bOregon Health and Science University
000000201 269__ $$a2008
000000201 336__ $$aDissertation
000000201 502__ $$bPh.D.
000000201 520__ $$aNitrate is the primary nitrogen source for crops but poses environmental risks through leaching and nitrous oxide emissions, particularly in manured agricultural systems. Long‑term manure application can increase soil pools of recalcitrant organic nitrogen that mineralize slowly and contribute nitrate during periods of low crop uptake. This study developed the RONDIMS model to estimate long‑term accumulation and mineralization of recalcitrant organic nitrogen, predicting substantial cool‑season nitrate production. Field measurements using ion exchange resin/soil cores in Oregon’s Willamette Valley confirmed significant cool‑season mineralization. Method comparisons showed disturbed cores reduced variability but occasionally increased mineralization, highlighting trade‑offs in measurement approaches.
000000201 540__ $$fCC BY
000000201 542__ $$fIn copyright - single owner
000000201 650__ $$aNitrogen Oxides$$022950
000000201 650__ $$aSoil$$026162
000000201 650__ $$aNitrogen$$022945
000000201 651__ $$aOregon--Willamette River Valley$$044824
000000201 6531_ $$aagriculture and the environment
000000201 6531_ $$amanure gases
000000201 691__ $$aOGI School of Science and Engineering$$041365
000000201 692__ $$aDepartment of Environmental and Biomolecular Systems$$041414
000000201 7001_ $$aMoberg, Dean$$uOregon Health and Science University$$041354
000000201 7201_ $$aJohnson, Rick$$uOregon Health and Science University$$041354$$7Personal$$eAdvisor
000000201 8564_ $$939bcf312-7c18-4d89-8028-4b2625e69348$$s897050$$uhttps://digitalcollections.ohsu.edu/record/201/files/201_etd.pdf$$ePublic$$23b71a27f961fb0740890190b07c3ff5c$$31
000000201 901__ $$a<p>These documents are archival records. They are retained for historical reference only. </p><p><b>Need an accessible version? Use the ‘Get Accessible Copy’ link above.</b></p>
000000201 905__ $$a/rest/prod/mk/61/rg/92/mk61rg92z
000000201 909CO $$ooai:digitalcollections.ohsu.edu:201$$pstudent-work
000000201 956__ $$aGet Accessible Copy$$uhttps://ohsu.libwizard.com/f/requestaccessibledocument
000000201 980__ $$aTheses and Dissertations