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Ammonia (NH3) loss associated with the application of urea fertilizer is a major concern to farmers all over the world because of the reduction in fertilizer use efficiency and the impact of ammonia on the environment and human health. Process-based biogeochemical models such as the Denitrification-Decomposition (DNDC) model can provide reliable estimations of agricultural nitrogen loss, information which is necessary for developing better management practices. Recently, the Canadian version of the model (DNDC v.CAN) was developed to incorporate a sub-model capable of predicting NH3 volatilization after the field application of slurry, but did not include a mechanism for simulating soil pH buffering or fertilizer application at depth, the inclusions of which, may further improve NH3 loss estimations into DNDC. Using published data collected from four studies in Québec, Canada, the objective of this work was to include the effect of urease hydrolysis on soil pH buffering in DNDC v.CAN and test and improve the model for estimating NH3 loss after surface and incorporated urea fertilizer application. Using scenario analyses an integrated assessment of the influence of environmental and management factors on NH3 losses were also evaluated. The improvements to the mechanisms regulating N losses in DNDC v.CAN will have positive implications in the ability of the model to accurately model N cycling in agro-ecosystems.
Urea, Ammonia volatilization, DNDC, Modeling, pH buffer, Scenario assessment
. 2016. Application of DNDC to estimate ammonia loss from surface and incorporated urea fertilizer in temperate agroecosystems. CSBE/SCGAB 2016 Annual Conference, Halifax, 3-6 July 2016.
CSBE/SCGAB 2016 Annual Conference, Halifax, 3-6 July 2016.
Session 3B: Air Quality in Plant Agriculture and Livestock Farming
Canadian Society for Bioengineering