Title:	Modeling impacts of N sources on N2O emissions in long-term crop rotation system in Brazils Cerrado using DNDCv.CAN.
Authors:	SOARES, J. R. FREITAS, A. C. R. de ALVES, B. J. R. SMITH, W. GRANT, B. DRURY, C. F. JANTALIA, C. P. CARVALHO, M. da C. S. MADARI, B. E.
Affiliation:	JOHNNY RODRIGUES SOARES; ANTONIO CARLOS REIS DE FREITAS, CPACP; BRUNO JOSE RODRIGUES ALVES, CNPAB; WARD SMITH, AGRICULTURE AND AGRI-FOOD CANADA; BRIAN GRANT, AGRICULTURE AND AGRI-FOOD CANADA; CRAIG F. DRURY, AGRICULTURE AND AGRI-FOOD CANADA; CLAUDIA POZZI JANTALIA, CNPS; MARIA DA CONCEICAO SANTANA CARVALHO, CNPAF; BEATA EMOKE MADARI, CNPAF.
Date Issued:	2026
Citation:	Ecological Modelling, v. 515, n.111513, may 2026.
Description:	Predicting N2O emissions can help identify crop production practices and environmental conditions for mitigation. The objectives were to calibrate and validate the DeNitrification-DeComposition (DNDCv.CAN) model to simulate N2O emission in crop rotation (CR) systems in Brazil’s Cerrado biome, using different N fertilizer sources. Field data were obtained from a CR experiment with maize and common beans cultivated under no-till for 10 years. Treatments were: Zero-N, calcium ammonium nitrate (CAN), urea (UR), and ammonium sulfate (AS), with 5 replicates. Measured data including N2O fluxes, NH3 volatilization, soil NH4+and NO3-, water-filled pore space (WFPS), and grain yields were used to calibrate and validate the DNDCv.CAN. The model acceptably captured the daily N2O emissions associated with different N sources, although episodic peaks were over or under-predicted. Correlation coefficient was 0.62 during calibration, with a mean absolute error of 17 g N2O-N ha-1 day-1, close to average measured (18 g ha-1 d-1), and simulated (17 g ha-1 day-1) emissions. Accumulated measured N2O-N emissions were 1.19, 4.38, 3.17, and 2.56 kg N2O-N ha-1 for Zero-N, CAN, UR, and AS, respectively, whereas the simulated were 1.13, 3.44, 2.24, and 3.32 kg N2O-N ha-1. The NH3, NH4+, NO3-, WFPS, and yields were also fairly simulated. Soil hydrologic parameters were adjusted in the model using a built in pedotransfer function to improve the simulations, which should be further investigated. The DNDCv.CAN effectively simulated cumulative N2O emissions from different N sources applied to CR under tropical conditions, making it valuable for evaluating potential emissions and mitigation strategies.
NAL Thesaurus:	Nitrous oxide Ammonia Oxisols
Keywords:	Irrigated common bean Mineral N
DOI:	https://doi.org/10.1016/j.ecolmodel.2026.111513
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPACP)