In:
Soil Science Society of America Journal, Wiley, Vol. 81, No. 6 ( 2017-11), p. 1537-1547
Abstract:
Core Ideas Limited data are available about mitigating N 2 O emissions from urine patches on semiarid pasture. Nitrapyrin reduced cumulative N 2 O emissions by 39% in a dry season. Nitrapyrin reduced cumulative N 2 O emissions by 58% in normal precipitation season. NBPT and NBPT plus DCD did not limit N 2 O emissions compared with untreated urine patches. N 2 O emission factors ranged from 0.03 to 0.21% over two grazing seasons Urease and/or nitrification inhibitors applied to urine patches or pastures may increase N retention in the soil–plant system, but how N 2 O emissions respond to these N stabilizers in semiarid regions is poorly understood. The objectives of this research were (i) to quantify N 2 O emissions and the associated emission factors, based on the percentage of applied urine‐N emitted as N 2 O–N, from beef cattle urine patches (urine) and (ii) to test the N 2 O reduction potential of three N stabilizers [2‐chloro‐6(trichloromethyl) pyridine (nitrapyrin), N‐(n‐butyl)‐thiophosphoric triamide (NBPT), and NBPT plus dicyandiamide (DCD)] on a semiarid tame pasture over two grazing seasons in western Canada. A deionized water control was also included. Nitrapyrin reduced cumulative N 2 O emissions by 39% and the N 2 O emission factor by 50% compared with untreated urine in a dry grazing season and reduced cumulative N 2 O emissions by 58% and the N 2 O emission factor by 68% compared with untreated urine in a grazing season with normal precipitation. The NBPT and NBPT + DCD had similar cumulative N 2 O emissions compared with untreated urine patches. The N 2 O emission factors ranged from 0.03 to 0.08% over 103 d in 2015 and from 0.06 to 0.21% over 119 d in 2016, all lower than the 2% Intergovernmental Panel on Climate Change default 365‐d value. Extrapolating over 1‐yr periods, N 2 O emission factors ranged from 0.11 to 0.64%. Based on the N stabilizers tested, nitrapyrin most effectively reduced N 2 O emissions from beef cattle urine patches on a tame pasture in a nonirrigated semiarid region of Canada.
Type of Medium:
Online Resource
ISSN:
0361-5995
,
1435-0661
DOI:
10.2136/sssaj2017.04.0123
Language:
English
Publisher:
Wiley
Publication Date:
2017
detail.hit.zdb_id:
241415-6
detail.hit.zdb_id:
2239747-4
detail.hit.zdb_id:
196788-5
detail.hit.zdb_id:
1481691-X
SSG:
13
SSG:
21
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