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Application of Nitrapyrin with Banded Urea, Urea Ammonium Nitrate, and Ammonia Delays Nitrification and Reduces Nitrogen Loss in Canadian Soils
Author(s) -
Degenhardt Rory F.,
Juras Len T.,
Smith Laura R.A.,
MacRae Andrew W.,
Ashigh Jamshid,
McGregor William R.
Publication year - 2016
Publication title -
crop, forage and turfgrass management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.29
H-Index - 10
ISSN - 2374-3832
DOI - 10.2134/cftm2016.03.0027
Subject(s) - nitrification , agronomy , leaching (pedology) , fertilizer , urea , ammonium , chemistry , soil water , nitrogen , denitrification , ammonium nitrate , nitrate , environmental science , biology , soil science , organic chemistry
Core Ideas Nitrapyrin has been tested in fallow field trials in cereal and oilseed growing regions of Canada. Nitrapyrin maintained N in the ammonium form through critical loss periods. Nitrapyrin preserved more mineral N in the soil relative to non‐stabilized fertilizer.Soil N loss is a significant impediment to maximizing yield and profitability for farmers in Canada. Maintaining N in the stable and plant‐available NH 4 + form via use of nitrification inhibitors limits the potential for soil N losses from denitrification or leaching. Between 2013 and 2015, twenty‐one research trials were established across the major cereal and oilseed growing regions of Canada to evaluate the efficacy of two commercially available formulated nitrapyrin products, eNtrenchTM and N‐Serve, at stabilizing soil N in the NH 4 + form and protecting against N loss. Urea, urea ammonium nitrate (UAN) or NH 3 fertilizer treatments were banded in the fall or spring on fallow land, and the soil was sampled to a depth of 60 cm at multiple time intervals after application. Fall applications of nitrapyrin resulted in 21–63% more NH 4 N, and 10–19% more total mineral N, at spring sampling after soil thaw relative to non‐stabilized fertilizer. Spring applications of nitrapyrin resulted in larger pools of NH 4 –N for at least 8 weeks after treatment, and they increased total mineral N by up to 25%, compared with non‐stabilized treatments. Results suggest that eNtrench and N‐Serve are useful tools for growers looking to protect their N investment, optimize crop yield potential, and enhance flexibility of their N application timing.