Evaluation of NEXEN™ stabilized nitrogen applied to overhead irrigated cotton (Gossypium hirsutum L.)

Antille, Diogenes L. and Nguyen-Ky, Tai and Aikins, Kojo Atta ORCID: https://orcid.org/0000-0003-0129-4816 and Hussein, Mahmood A. H. and Singh, Sawtenterpreet and Luhaib, Adnan A. A and Singh, Amrit (2018) Evaluation of NEXEN™ stabilized nitrogen applied to overhead irrigated cotton (Gossypium hirsutum L.). In: 2018 ASABE Annual International Meeting, 29 Jul - 1 Aug 2018, Detroit, Michigan.


Abstract

This study was conducted to determine the agronomic feasibility of using NEXENTM (urea treated with the urease inhibitor N-(N-butyl) thiophosphoric triamide) for surface of nitrogen (N) fertilizer in irrigated cotton, particularly, for in-crop season N applications. Field experiments were established on a cotton farm in southern Queensland (Australia) during the 2015-2016 season. Fertilizers were applied at N rates equivalent to 0 (control), and 140, 200 (farm practice) and 260 kg ha-1, respectively, to provide a ±30% range of the standard rate used for the commercial crop. The fertilizer was applied on the surface, incorporated or a combination of both pre-plant incorporation and surface application in-crop. Results showed that there was no fertilizer type or nitrogen rate effect above an application rate of 140 kg ha-1 N. This was consistent with analyses of cottonseed N from fertilizer-treated crop, which suggested that the crop was over-supplied with N above that rate. Given these results, the use of NEXENTM appears to be a promising alternative for (overhead) irrigated cotton, for both pre-plant and in-crop season application of N. Although commonly used in the Australian cotton industry, techniques such as ‘water-run‘ urea are considered as low efficiency because of the associated environmental losses of N. Surface application of nBTPT-treated urea with conventional twin discs fertilizer spreaders may enable for improved field operating efficiency and reduced cost of fertilizer application compared with other methods or fertilizer types that require soil incorporation. Our estimates indicated that operating costs may be reduced from approximately AUD16 per ha to AUD5 per ha (AUD1 ≈ USD0.75) when fertilizer is surface-applied compared with soil incorporation, because of lower energy requirements (draft) and labor (operating width, forward speed), with further savings achieved through improved timeliness. This alternative requires investigation to determine the potential risk of N losses through gaseous evolution (volatilization, N2/N2O), particularly in furrow irrigated systems.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Agricultural Engineering (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Agricultural Engineering (1 Aug 2018 -)
Date Deposited: 17 Jan 2020 01:52
Last Modified: 11 Feb 2020 00:57
Uncontrolled Keywords: Enhanced efficiency fertilizers, Nitrogen use efficiency, Soil incorporation, Surface fertilizer application, Urea treated with N-(N-butyl) thiophosphoric triamide.
Fields of Research (2008): 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070302 Agronomy
Identification Number or DOI: doi:10.13031/aim.201800252
URI: http://eprints.usq.edu.au/id/eprint/34701

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