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    Temperate Grassland Yields and Nitrogen Uptake Are Influenced by Fertilizer Nitrogen Source

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    Author
    Harty, Mary A.
    Forrestal, Patrick J.
    Carolan, Rachael
    Watson, C. J.
    Hennessy, Deirdre cc
    Lanigan, Gary
    Wall, David
    Richards, Karl G.
    Keyword
    Greenhouse gas emmissions
    Nitrogen uptake
    urease inhibitors
    nitrification inhibitors
    Nitrogen source
    Grassland yield
    calcium ammonium nitrate (CAN)
    urea+N-(n-butyl) thiophosphoric triamide (NBPT),
    urea+NBPT+dicyandiamide (DCD),
    Urea
    Date
    25/01/2017
    
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    URI
    http://hdl.handle.net/11019/1127
    Citation
    Harty, 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
    Abstract
    In 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.
    Funder
    Department of Agriculture, Food and the Marine, Ireland; Teagasc Walsh Fellowship Programme; Department of Agriculture and Rural Development, Northern Ireland
    Grant Number
    RSF10-/RD/SC/716; RSF11S138
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.2134/agronj2016.06.0362
    Scopus Count
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    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Environment, Soils & Land Use

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