02275naa a2200289 a 450000100080000000500110000800800410001902200140006002400530007410000180012724501320014526000090027752013620028665000200164865000200166865000130168865000130170165000220171465000220173665000100175865000290176865000150179765000160181265300260182870000210185477301100187521597522023-12-14       2023    bl uuuu     u00u1 u    #d  a2363-60337 ahttps://doi.org/10.17170/kobra-2023061282022DOI1 aWANDER, A. E.  aEconomic evaluation of biological nitrogen fixation in flooded rice cultivation in subtropical lowlands.h[electronic resource]  c2023  aThis 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.  aEconomic impact  aIrrigated soils  aLowlands  aNitrogen  aNitrogen fixation  aSubtropical soils  aArroz  aFixação de Nitrogênio  aInoculante  aNitrogênio  aDiazotrophic bacteria1 aMATTOS, M. L. T.  tJournal of Agriculture and Rural Development in the Tropics and Subtropicsgv. 124, n. 1, p. 57-63, 2023.