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Nitrogen use efficiency of ¹⁵N urea applied to wheat based on fertiliser timing and use of inhibitors

Wallace, A. J.; Armstrong, R. D.; Grace, P. R.; Scheer, C.; Partington, D. L.

Abstract (englisch):
Improving fertiliser nitrogen (N) use efficiency is essential to increase productivity and avoid environmental damage. Using a 15N mass balance approach, we investigated the effects of five N fertiliser management strategies to test the hypothesis that increasing uptake of applied N by wheat improves productivity and reduces loss of N in a semi-arid environment. Three experiments were conducted between 2012 and 2014. Treatments included urea application (50 kg N/ha) at sowing with and without nitrification inhibitor (3,4-dimethylpyrazole phosphate, DMPP) and surface broadcast with and without urease inhibitor (n-butyl thiophosphoric triamide, NBPT) at the end of tillering plus an unfertilised control. It was found that deferring fertiliser application until the end of tillering decreased losses of fertiliser N (35–52%) through increasing uptake by the crop and or recovery in the soil at harvest, while maintaining yield except when rainfall following application was low. In this case, deferring application reduced fertiliser uptake (− 71%) and grain yield (− 18%) and increased recovery of N in the soil (+ 121%). Use of DMPP or NBPT reduced N loss where seasonal conditions were conducive to denitrification during winter (DMPP) and volatilisation or denitrification later in the season (NBPT). ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000099997
Veröffentlicht am 14.02.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1385-1314, 1573-0867
KITopen-ID: 1000099997
HGF-Programm 12.02.01 (POF III, LK 01)
Effects of land use and climate change
Erschienen in Nutrient cycling in agroecosystems
Band 116
Seiten 41-56
Vorab online veröffentlicht am 23.10.2019
Schlagwörter Nitrification inhibitor; Urease inhibitor; Recovery efficiency; Physiological efficiency; Agronomic efficiency
Nachgewiesen in Web of Science
Scopus
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