BREVILIERI, C.

DIECKOW, J.

LUZ, P. C. I. da

SIMON, P. L.

ZANATTA, J. A.

English

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216II SIGEE – Second International Symposium on Greenhouse Gases in Agriculture – ProceedingsDocumentosISSN 1983-974XOutubro, 2016 470Mitigation of nitrous oxide emission from cattle excreta in pasture with dicyandiamide (DCD)Mitigation of nitrous oxide emission from cattle excreta in pasture with dicyandiamide (DCD)Paola Cristina Iungblod DA LUZ1, Priscila Luzia SIMON¹, Reinaldo Car-los BREVILIERI¹, Jeferson DIECKOW1, Josiléia Acordi ZANATTA³.1Universidade Federal do Paraná, Curitiba - PR, 2 EMBRAPA-Florestas, Colombo - PR.E-mail address of presenting author*: pahioungluz@gmail.comIntroductionThe agricultural activity is a major contributor to the emission of nitrous oxide (N2O) and the adoption of management practices that minimize this emission is crucial. The Brazilian cattle herd is over 200 million heads and its excreta contribute to 41% of national N2O emission. Thus the objective of this study was to evaluate the efficiency of dicyandiamide (DCD), a nitrification inhibitor at reducing the emission of N2O and determining the best way of applying the inhibitor, if sprayed onto or mixed with urine and dairy manure.Material and MethodsThe study was conducted at the experimental farm of the Federal University of Parana, in Pinhais-PR, from January to October 2014 in three seasons representing the Summer, Autumn and Winter. The tre-atments were: soil without excreta and without DCD (control group); application of urine (U), urine mixed with DCD (U+DM) and urine sprayed with DCD (U+DP); application of dung (D); dung mixed with DCD (D+DM) and dung sprayed with DCD (D+DP). The experimental design was a randomized block design with four replications. Metal collars of 0.083 m2 were inserted into the soil and served to delimit the treatment spots and to support the gas collecting chamber (static chamber method). Air samples were analyzed by gas chromatography.471Mitigation of nitrous oxide emission from cattle excreta in pasture with dicyandiamide (DCD)Results and ConclusionsThe use of DCD mixed with urine reduced N2O emissions by 79 and 55% in autumn and winter, respectively. When sprayed, DCD was efficient only in autumn, with a reduction of 45% of emission. In Summer, the use of DCD was not efficient to reduce emissions. In autumn, there was no significant difference in the forms of application of DCD, being both efficient in reducing emissions. For dung, DCD was significantly efficient only in winter, and when applied in mixed form, which may be related to the originally low N2O emission in this type of excreta.ReferencesIBGE - Instituto Brasileiro de Geografia e Estatística. Censo Agropecuário. Rio de Janeiro, 2010.DE KLEIN, C.A.M. & LEDGARD, S.F. Nitrous oxide emissions from New Zealand agricul-turekey sources and mitigation strategies. Nutrient Cycling in Agroecosystems. 2005; 72: 77-85.

Mitigation of nitrous oxide emission from cattle excreta in pasture with dicyandiamide (DCD).

http://www.alice.cnptia.embrapa.br/bitstream/doc/1059437/1/2016JosileiaSIGEEMitigation.pdf

Mitigation of nitrous oxide emission from cattle excreta in pasture with dicyandiamide (DCD).

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