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Improving SOC Modelling of Manure Amendments for Croplands

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Title: Improving SOC Modelling of Manure Amendments for Croplands
Author: Durnin-Vermette, Francis
Department: School of Environmental Sciences
Program: Environmental Sciences
Advisor: Gillespie, AdamVoroney, PaulGenevieve, Ali
Abstract: In this thesis I analyse manure decay using a variety of methods, and use the results to inform the modification of a \ac{SOC} model with the goal of improving SOC prediction accuracy for manure-amended croplands. The methods used in the first three chapters are: 1) qualitative literature review of manure \ac{C} mineralization experiments, 2) quantitative literature review of much the same papers with the goal of establishing relationships between manure decay rates and animal type, composting treatment, manure pH, and manure C/N, and 3) calculation of manure decay parameters and correlation analysis. In the final chapter, the results from the preceding chapters are used to inform the modification of an SOC model: manure-C accounting and a rate-modifying factor for manure. The modifications increased SOC estimation accuracy for long-term field experiments, but not for a typical Ontario production farm. Manure composting treatment, storage type, and manure C/N are good predictors of manure decomposition dynamics in SOC models.
Date: 2023-01
Rights: Attribution-NonCommercial 4.0 International

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