期刊
ARCHIVES OF AGRONOMY AND SOIL SCIENCE
卷 65, 期 5, 页码 625-639出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/03650340.2018.1519251
关键词
Ammonia; fertilizer management; greenhouse gas emissions; urease inhibitor; nitrous oxide
资金
- Fundacao de Amparo a Pesquisa do Estado de Goias [2015-10267001479]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [2015/50305-8]
- Fundacao de Amparo a Pesquisa e ao Desenvolvimento Cientifico e Tecnologico do Maranhao [RCUK-02771/16]
- Newton Fund via the UK research council BBSRC [BB/N013201/1, BB/N013468/1]
- Newton Fund via the UK research council NERC [BB/N013201/1, BB/N013468/1]
- BBSRC [BBS/E/C/000I0320, BB/P004539/1, BB/N013204/1, BB/N013468/1] Funding Source: UKRI
Fertiliser nitrogen (N) is essential for maintaining agronomic outputs for our growing population. However, the societal, economic and environmental impacts of excess reactive N from fertiliser is rarely assessed. Here the agronomic, economic and environmental efficacy of three N-fertiliser sources, ammonium-nitrate (AN), urea (U), and inhibited-urea (IU; with NPBT) were evaluated at two grassland sites. Dry matter yield and herbage quality were measured at each silage-cut. Additionally, NH3-N and N2O-N losses were measured and used to calculate the effective N source cost and externality costs, which account for associated environmental and societal impacts. We found no effect of different N sources on yield or herbage quality. However, NH3-N emissions were significantly reduced under the IU treatment, by 48-65%. No significant differences in cumulative N2O emissions were observed. Incorporating externality costs increased fertiliser prices by 1.23-2.36, 6.51-16.4, and 3.17-4.17 times the original cost, for AN, U and IU, respectively, transforming U from the cheapest, to the most expensive of the N sources examined. However, with no apparent yield differences between N-fertiliser sources there is no economic incentive for the land-manager to use the more environmentally and socially acceptable option, unless externality costs are incorporated into fertiliser prices at the point of sale.
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