Characterizing the efficacy of novel nitrogen stabilizer products at reducing fertilizer nitrogen losses

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dc.contributor.authorNyathi, Sithabile Edith
dc.contributor.examiningcommitteeGao, Xiaopeng (Soil Science)
dc.contributor.examiningcommitteeAmarakoon, Inoka (Soil Science)
dc.contributor.supervisorZvomuya, Francis
dc.contributor.supervisorAdesanya, Theresa
dc.date.accessioned2024-09-17T14:32:46Z
dc.date.available2024-09-17T14:32:46Z
dc.date.issued2024-08-26
dc.date.submitted2024-08-27T04:12:59Zen_US
dc.date.submitted2024-09-17T00:48:12Zen_US
dc.degree.disciplineSoil Science
dc.degree.levelMaster of Science (M.Sc.)
dc.description.abstractUrea-based fertilizers (urea and urea ammonium nitrate (UAN)) are susceptible to nitrate (NO3-) leaching, ammonia (NH3-) volatilization, and nitrous oxide (N2O) emission losses, resulting in low fertilizer nitrogen (N) efficiency and presenting a risk to human and environmental health. Nitrogen stabilizer products containing the urease inhibitor N-(n-butyl) thiophosphoric triamide (NBPT) and the nitrification inhibitor 3,4-dimethyl pyrazole phosphate (DMPP) can enhance wheat yield and optimize fertilizer efficiency while mitigating N losses. However, their high price hinders wider adoption by farmers. This study examined the efficacy of potentially cost-effective, double inhibitor (DI) formulations in decreasing N losses and improving crop N efficiency. Specifically, the study assessed the impacts of ARMU Advanced (ARMU-Adv) formulations (i.e., NBPT: DMPP ratios of 1:1 and 1:0.5) at mitigating N losses and improving wheat biomass yield and N efficiency. A no-inhibitor and a no-fertilizer (control) treatment were included for comparison. Results showed that the ARMU-Adv formulations were effective at reducing NH3 volatilization and N2O emission and improving shoot N uptake and apparent N recovery (ANR) relative to untreated fertilizers. Overall, the ARMU-Adv formulations were more effective with urea than with UAN in reducing NH3 volatilization and enhancing shoot N uptake and ANR, whereas inhibitor-treated UAN showed greater efficacy in mitigating N2O losses relative to urea. These findings demonstrate the potential of ARMU-Adv formulations to reduce N losses and enhance yield and N efficiency in wheat-based cropping systems.
dc.description.noteOctober 2024
dc.description.sponsorshipNSERC Discovery Grant Program
dc.identifier.urihttp://hdl.handle.net/1993/38612
dc.language.isoeng
dc.rightsopen accessen_US
dc.subjectDouble inhibitor
dc.subjectUrease inhibitor
dc.subjectNitrification inhibitor
dc.subjectNBPT
dc.subjectDMPP
dc.subjectAmmonia volatilization
dc.subjectNitrous oxide
dc.subjectNitrate
dc.subjectWheat
dc.subjectUrea
dc.subjectUrea ammonium nitrate
dc.titleCharacterizing the efficacy of novel nitrogen stabilizer products at reducing fertilizer nitrogen losses
dc.typemaster thesisen_US
local.subject.manitobayes
project.funder.nameActive AgriScience Inc.
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