Emission factors for estimating fertiliser-induced nitrous oxide emissions from clay soils in Australia’s irrigated cotton industry

Grace, Peter, Shcherbak, Iurii, Macdonald, Ben, Scheer, Clemens, & Rowlings, David (2016) Emission factors for estimating fertiliser-induced nitrous oxide emissions from clay soils in Australia’s irrigated cotton industry. Soil Research, 54(5), pp. 598-603.

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Abstract

As a significant user of nitrogen (N) fertilisers, the Australian cotton industry is a major source of soil-derived nitrous oxide (N2O) emissions. A country-specific (Tier 2) fertiliser-induced emission factor (EF) can be used in national greenhouse gas inventories or in the development of N2O emissions offset methodologies provided the EFs are evidence based. A meta-analysis was performed using eight individual N2O emission studies from Australian cotton studies to estimate EFs. Annual N2O emissions from cotton grown on Vertosols ranged from 0.59kgNha-1 in a 0N control to 1.94kgNha-1 in a treatment receiving 270kgNha-1. Seasonal N2O estimates ranged from 0.51kgNha-1 in a 0N control to 10.64kgNha-1 in response to the addition of 320kgNha-1. A two-component (linear+exponential) statistical model, namely EF (%)≤0.29+0.007(e0.037N - 1)/N, capped at 300kgNha-1 describes the N2O emissions from lower N rates better than an exponential model and aligns with an EF of 0.55% using a traditional linear regression model.

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ID Code: 98689
Item Type: Journal Article
Refereed: Yes
DOI: 10.1071/SR16091
ISSN: 1838-675X
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute for Future Environments
Copyright Owner: Copyright 2016 CSIRO
Deposited On: 07 Sep 2016 00:08
Last Modified: 07 Sep 2016 23:50

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