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Legumes or nitrification inhibitors to reduce N2O emissions from subtropical cereal cropping systems in Oxisols?

De Antoni Migliorati, Massimiliano and Parton, William J. and Del Grosso, Stephen J. and Grace, Peter R. and Bell, Mike J. and Strazzabosco, Alice and Rowlings, David W. and Scheer, Clemens and Harch, Gary (2015) Legumes or nitrification inhibitors to reduce N2O emissions from subtropical cereal cropping systems in Oxisols? Agriculture, Ecosystems & Environment, 213 . pp. 228-240. ISSN 0167-8809

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Article Link(s): http://dx.doi.org/10.1016/j.agee.2015.08.010

Publisher URL: http://www.sciencedirect.com/science/article/pii/S0167880915300542

Abstract

The DAYCENT biogeochemical model was used to investigate how the use of fertilizers coated with nitrification inhibitors and the introduction of legumes in the crop rotation can affect subtropical cereal production and N2O emissions. The model was validated using comprehensive multi-seasonal, high-frequency dataset from two field investigations conducted on an Oxisol, which is the most common soil type in subtropical regions. Different N fertilizer rates were tested for each N management strategy and simulated under varying weather conditions. DAYCENT was able to reliably predict soil N dynamics, seasonal N2O emissions and crop production, although some discrepancies were observed in the treatments with low or no added N inputs and in the simulation of daily N2O fluxes. Simulations highlighted that the high clay content and the relatively low C levels of the Oxisol analyzed in this study limit the chances for significant amounts of N to be lost via deep leaching or denitrification. The application of urea coated with a nitrification inhibitor was the most effective strategy to minimize N2O emissions. This strategy however did not increase yields since the nitrification inhibitor did not substantially decrease overall N losses compared to conventional urea. Simulations indicated that replacing part of crop N requirements with N mineralized by legume residues is the most effective strategy to reduce N2O emissions and support cereal productivity. The results of this study show that legumes have significant potential to enhance the sustainable and profitable intensification of subtropical cereal cropping systems in Oxisols.

Item Type:Article
Business groups:Crop and Food Science
Keywords:DAYCENT N2O emissions Nitrification inhibitors Legumes Cereal Subtropical Oxisols
Subjects:Agriculture > Agriculture (General) > Methods and systems of culture. Cropping systems
Plant culture > Field crops > Grain. Cereals
Plant culture > Field crops > Forage crops. Feed crops
Deposited On:01 Feb 2016 23:01
Last Modified:01 Feb 2016 23:01

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