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Ammonia volatilization and nitrous oxide emissions following soil application of pig slurry in corn

Gonzatto, R.; Carvalho Miola, E.C.; Doneda, A.; Pujol, S.B.; Aita, C.; Giacomini, S.J.

Ciencia Rural 43(9): 1590-1596

2013

ISSN/ISBN: 0103-8478
DOI: 10.1590/s0103-84782013000900009
Accession: 066276130
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The nitrogen (N) losses through gaseous emissions of ammonia (NH3) and nitrous oxide (N2O) after pig slurry (PS) application in soil is a subject still little studied in Brazil, especially under no-till conditions. Therefore, the objective of this study was to evaluate, under field conditions, the NH3 volatilization and the N2O emission after PS application in corn, with and without surface oat straw. The treatments for measuring N2O emissions, during 90 days, were: T1-unamended soil (control), T2 - Soil + PS, T3 - Soil + oat straw and T4 - Soil + PS + oat straw. The NH3 volatilization was quantifined only in the last three treatments. PS, at the dose 60m(3) ha(-1), was applied prior the sowing of corn, in a randomized design, with three replications. Oat straw on the soil surface reduced NH3 volatilization by 34%, but enhanced N2O emission by 167%. The higher N2O fluxes occurred during the first 40 days after PS addition, always after rain and/or irrigation events.

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