Field-scale evaluation of calcium ammonium nitrate, urea, and urea treated with N-(n-butyl) thiophosphoric triamide applied to grassland in Ireland

Antille, Diogenes L. and Hoekstra, Nyncke J. and Lalor, Stanley T. J. (2015) Field-scale evaluation of calcium ammonium nitrate, urea, and urea treated with N-(n-butyl) thiophosphoric triamide applied to grassland in Ireland. Communications in Soil Science and Plant Analysis , 46 (11). pp. 1345-1361. ISSN 0010-3624

Abstract

This study investigated the effects of nitrogen (N) source, rate, and timing of application on dry-matter yield (DMY), N responses, N uptake and N-use efficiency (NUE) in a grass crop. The experiment used three fertilizer treatments: calcium ammonium nitrate (CAN), urea, and urea treated with N-(n-butyl) thiophosphoric triamide (NBTPT), applied at 0 (control), 25, 50, and 75 kg ha−1 of N over eighteen application timings. Results showed relatively lower agronomic performance of urea compared with CAN when applied in early spring. Urea reported lower N responses, lower relative DMY (90 percent), and relative N uptake (85 percent), which translated in lower NUE (0.45 kg kg−1) compared with CAN (0.70 kg kg−1). In spring fertilizer applications, urea and NBTPT showed DMY and NUE values comparable to those obtained with CAN. However, NBTPT enhanced overall performance of urea, which was shown with increasing temperatures toward summer or increasing N application rates. For summer applications, the efficiency of urea was less (P < 0.05) than that of CAN or NBTPT in all measured parameters, suggesting greater ammonia volatilization loss in urea-treated grass. Nitrogen saved in volatilization improved uptake and responses in NBTPT-treated grass, and hence DMY was not affected compared with CAN in summer fertilizer applications. The results of this study are supportive of increased usage of urea-based fertilizers treated with NBTPT.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - USQ Other
Date Deposited: 02 Jun 2016 06:10
Last Modified: 03 Jun 2016 00:27
Uncontrolled Keywords: calcium ammonium nitrate; fertilizer use efficiency; fertilizer N response; NBTPT; temperate grassland; urea
Fields of Research : 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070306 Crop and Pasture Nutrition
05 Environmental Sciences > 0503 Soil Sciences > 050399 Soil Sciences not elsewhere classified
Socio-Economic Objective: D Environment > 96 Environment > 9614 Soils > 961402 Farmland, Arable Cropland and Permanent Cropland Soils
Identification Number or DOI: 10.1080/00103624.2015.1033540
URI: http://eprints.usq.edu.au/id/eprint/29220

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