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dc.contributor.authorLIMA, M. A. de
dc.contributor.authorBATISTA, G. das G.
dc.contributor.authorSILVA, J. A. da
dc.contributor.authorVILLELA, O. V.
dc.contributor.authorVIEIRA, R. F.
dc.contributor.authorGALVAO, J. A. H.
dc.date.accessioned2026-03-17T15:29:32Z-
dc.date.available2026-03-17T15:29:32Z-
dc.date.created2026-03-17
dc.date.issued2025
dc.identifier.citationContemporânea, v. 5, n. 11, e9627, 2025.
dc.identifier.issn2447-0961
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1185517-
dc.descriptionResumo: Flooded rice cultivation represents one of the main global anthropogenic sources of methane (CH4), a major greenhouse gas that strongly affects atmospheric photochemistry. CH4 production and emissions are influenced by several factors, such as climate, organic residues in water and soil, root exudates, water management, soil physicochemical and biological characteristics, and the cultivar. There are few studies in Brazil focused on the influence of cultivars on CH4 emissions. This experiment aimed to evaluate seasonal methane emissions using two varieties, IAC 105 and Epagri 106, in a pre-germinated cultivation system with a continuous water regime in the municipality of Pindamonhangaba, São Paulo. Methane emissions were quantified using the static chamber method and chromatographic analysis. Methane emissions increased with increasing tillering, with the main peak occurring at flowering. Despite the different life cycles of the varieties, no significant difference was found between seasonal methane emissions (117.91 kg CH4 ha-1 for IAC 105 and 108.92 kg CH4 ha-1 for Epagri 106). These emissions were not related to plant height, number of tillers, and grain yield. An emission factor of 0.98 kg CH4 ha-1 day-1 was estimated for IAC 105 and 0.95 kg CH4 ha-1 day-1 for Epagri 106. The yield-scaled pGWP (YpGWP) was estimated at 1.02 kg CO2eq kg-1 grain for both cultivars.
dc.language.isoeng
dc.rightsopenAccess
dc.subjectMethane
dc.subjectFlooded rice
dc.subjectPre-germinated system
dc.subjectIAC 105
dc.subjectEpagri 106
dc.titleSeasonal methane emissions in paddy rice with two cultivars in the southeast of Brasil.
dc.typeArtigo de periódico
dc.subject.thesagroArroz Inundado
dc.subject.thesagroMetano
dc.subject.thesagroEfeito Estufa
dc.subject.nalthesaurusRice
dc.subject.nalthesaurusPaddy soils
dc.subject.nalthesaurusMethane
dc.subject.nalthesaurusGreenhouse gas emissions
dc.subject.nalthesaurusCultivars
riaa.ainfo.id1185517
riaa.ainfo.lastupdate2026-03-17
dc.contributor.institutionMAGDA APARECIDA DE LIMA, CNPMA; GIOVANA DAS GRAÇAS BATISTA; JOSÉ ADRIANO DA SILVA; OMAR VIEIRA VILLELA; ROSANA FARIA VIEIRA, CNPMA; JOSE ABRAHAO HADDAD GALVAO, CNPMA.
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