Temperate Grassland Yields and Nitrogen Uptake Are Influenced by Fertilizer Nitrogen Source
AuthorHarty, Mary A.
Forrestal, Patrick J.
Watson, C. J.
Richards, Karl G.
KeywordGreenhouse gas emmissions
calcium ammonium nitrate (CAN)
urea+N-(n-butyl) thiophosphoric triamide (NBPT),
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CitationHarty, M. A., P. J. Forrestal, R. Carolan, C. J. Watson, D. Hennessy, G. J. Lanigan, D. P. Wall, and K. G. Richards. 2017. Temperate Grassland Yields and Nitrogen Uptake Are Influenced by Fertilizer Nitrogen Source. Agron. J. 109:71-79. doi:10.2134/agronj2016.06.0362
AbstractIn temperate grasslands, N source influences greenhouse gas emissions. Nitrification and urea hydrolysis inhibitors can reduce these losses. The objective of this study was to evaluate the impact of N source, urease inhibitors, and nitrification inhibitors on temperate grassland yields and N uptake. Experiments were conducted at three locations over 2 years (6 site-years) on the island of Ireland, covering a range of soils and climatic conditions. Results showed that calcium ammonium nitrate (CAN), urea+N-(n-butyl) thiophosphoric triamide (NBPT), urea+NBPT+dicyandiamide (DCD), and urea had equal annual dry matter yield. Urea+DCD had lower dry matter yield than CAN for 3 site-years. Calcium ammonium nitrate and urea+NBPT consistently had the same N uptake, urea+DCD had lower N uptake than CAN in 4 of 6 site-years, urea had lower N uptake than CAN in 2 site-years, and urea+NBPT+DCD had lower N uptake than CAN in 1 site-year. Urea+NBPT is a cost-effective alternative to CAN, which is consistently equal in terms of yield and N uptake in temperate grassland.
FunderDepartment of Agriculture, Food and the Marine, Ireland; Teagasc Walsh Fellowship Programme; Department of Agriculture and Rural Development, Northern Ireland
Grant NumberRSF10-/RD/SC/716; RSF11S138