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Temperate Grassland Yields and Nitrogen Uptake Are Influenced by Fertilizer Nitrogen Source
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Date
25/01/2017
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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.