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Injection of Dicyandiamide‐Treated Pig Slurry Reduced Ammonia Volatilization without Enhancing Soil Nitrous Oxide Emissions from No‐Till Corn in Southern Brazil
Author(s) -
Aita Celso,
Gonzatto Rogério,
Miola Ezequiel C. C.,
dos Santos Daniela B.,
Rochette Philippe,
Angers Denis A.,
Chantigny Martin H.,
Pujol Stefen B.,
Giacomini Diego A.,
Giacomini Sandro J.
Publication year - 2014
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2013.07.0301
Subject(s) - nitrous oxide , volatilisation , nitrification , slurry , ammonia , chemistry , nitrogen , environmental science , zoology , ammonia volatilization from urea , environmental chemistry , agronomy , environmental engineering , organic chemistry , biology
There is a lack of information on how placement in soil and nitrification inhibitors affects nitrous oxide (N 2 O) and ammonia (NH 3 ) emissions from pig slurry (PS) applied under no‐till (NT) conditions. Our objective was to determine the impact of injecting PS and treating it with the nitrification inhibitor dicyandiamide (DCD) on NH 3 and N 2 O emissions from soils under NT in subtropical southern Brazil. The emissions of these gases were compared for shallow (∼ 10 cm) injection and surface broadcasting of PS with and without DCD (8.1–10.0 kg ha −1 ; 6.5–8.4% of applied NH 4 –N). Measurements were made at two sites during two summer growing seasons under NT corn crops. Injection reduced NH 3 volatilization by 70% but increased N 2 O emissions 2.4‐fold (from 2628 to 6198 g N 2 O N ha −1 ) compared with surface broadcast application. Adding DCD to PS inhibited nitrification and reduced N 2 O emissions by an average of 28% (730 g N 2 O–N ha −1 ) for surface broadcast and 66% (4105 g N 2 O–N ha −1 ) for injection but did not increase NH 3 volatilization. Consequently, N 2 O emission factors were much higher for injection (3.6%) than for surface broadcast (1.3%) application and were reduced (0.9%) when DCD was added to injected PS. In conclusion, the injection of DCD‐treated slurry is a recommendable practice for reducing NH 3 and N 2 O emissions when applying PS on NT corn in southern Brazil.