Economic evaluation of biological nitrogen fixation in flooded rice cultivation in subtropical lowlands.

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dc.contributorALCIDO ELENOR WANDER, CNPAF; MARIA LAURA TURINO MATTOS, CPACT.
dc.creatorWANDER, A. E.
dc.creatorMATTOS, M. L. T.
dc.date2023-12-14T18:32:55Z
dc.date2023-12-14T18:32:55Z
dc.date2023-12-14
dc.date2023
dc.date.accessioned2026-07-01T00:09:43Z
dc.descriptionThis study aimed to assess the economic viability of biological nitrogen fixation in flood rice cultivation in subtropical lowlands. A field experiment of seven treatments was carried out during the cropping seasons 2015/16, 2017/18, 2018/19 and 2019/20 at the Lowland Experimental Station of Embrapa, in Pelotas, RS, Brazil. The evaluated treatments were: (1) negative control (without N and inoculant); (2) positive control with recommended N-fertilisation (120 kg N ha−1, without inoculant) (standard recommendation); (3) inoculant 1 (accessions CMM 174 + CMM 175 + CMM 179); (4) inoculant 2 (accessions CMM 176 + CMM 197 + CMM 205); (5) combination of reduced N-fertiliser doses (90 kg N ha−1) + inoculant 1; (6) combination of reduced N-fertiliser doses (90 kg N ha−1) + inoculant 2; and (7) commercial inoculant [Azospirillum brasilense (strains Ab-V5 and Ab-V6)]. A partial budget was used to compare evaluated treatments with the standard recommendation regarding nitrogen fertilisation. Inoculant 2 composed of bacterial accessions CMM 176 (Rhizobium sp.), CMM 197 (Bacillus sp.) and CMM 205 (Aeromicrobium sp.) combined with reduced mineral nitrogen fertilisation [90 kg N ha−1 (applied in top dressing)] demonstrates the best agroeconomic efficiency in the production of irrigated rice in subtropical lowlands with the cultivar BRS Pampa.
dc.identifierJournal of Agriculture and Rural Development in the Tropics and Subtropics, v. 124, n. 1, p. 57-63, 2023.
dc.identifier2363-6033
dc.identifierhttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1159752
dc.identifierhttps://doi.org/10.17170/kobra-202306128202
dc.identifier.urihttp://hdl.handle.net/123456789/398688
dc.languageeng
dc.rightsopenAccess
dc.subjectDiazotrophic bacteria
dc.subjectArroz
dc.subjectNitrogênio
dc.subjectInoculante
dc.subjectFixação de Nitrogênio
dc.subjectIrrigated soils
dc.subjectNitrogen
dc.subjectNitrogen fixation
dc.subjectEconomic impact
dc.subjectSubtropical soils
dc.subjectLowlands
dc.titleEconomic evaluation of biological nitrogen fixation in flooded rice cultivation in subtropical lowlands.
dc.typeArtigo de periódico

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