Resposta do feijoeiro comum à inoculação com rizóbio e suplementação com nitrogênio mineral em dois biomas brasileiros
Carregando...
Data
2015
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
Common bean (Phaseolus vulgaris L.) may benefit from biological N 2 fixation, but inconsistent
responses of the crop to rhizobium inoculation indicate the need for supplemental mineral N fertilization.
In this study, we aimed to evaluate the response of the common bean crop to rhizobium inoculation in
association with supplemental mineral N in the Cerrado (Brazilian tropical savanna) and Atlantic
Forest biomes. Four field experiments were carried out, two in Santo Antônio de Goiás (State of Goiás),
one in Valença (State of Rio de Janeiro), and another in Macaé (State of Rio de Janeiro), all in Brazil.
Inoculation with commercial rhizobium strains was compared to inoculation with strain BR 923 of
Sinorhizobium sp., to mineral N fertilization, and to supplementation with N at sowing and in topdressing.
Evaluation of the native rhizobium population indicated 10 5 cells g -1 in the soil of the experimental area
in Goiás, previously cultivated with common bean, and 10 2 cells g 1 in the soil in Valença, previously kept
in pasture. In both experiments in Goiás, grain yields of around 2,100 kg ha -1 did not differ among the
control treatments, rhizobia inoculation, or the application of 120 kg ha -1 of N. In Valença, inoculation
with commercial strains provided yields from the cultivar Ouro Negro higher than the absolute control,
in the lack of topdressing N fertilization. With 40 kg ha -1 of N in topdressing, rhizobium inoculation led to
3,420 kg ha -1 of grain yield, higher than the other treatments. In the mean of different N sources at sowing,
topdressing fertilization increased grain yield from 2,367 to 2,542 kg ha -1 . In Macaé, in a soil with high
organic matter content, the highest yields were obtained with inoculation of commercial strains associated
with 40 kg ha -1 of N in topdressing, and there were deleterious effects from application of 80 kg ha -1 of N
at sowing. We conclude that in areas without a previous common bean crop, inoculation with commercial
rhizobium strains increases grain yield, particularly when associated with topdressing N fertilization.
Descrição
Palavras-chave
Fixação biológica de nitrogênio, Adubação de cobertura, Phaseolus vulgaris, Fixação biológica de nitrogênio, Phaseolus vulgaris, Adubação de cobertura
Citação
BRITO, Luciana Fernandes de; PACHECO, Rafael Sanches; SOUZA FILHO, Benedito Fernandes de; FERREIRA, Enderson Petrônio de Brito; STRALIOTTO, Rosângela; ARAUJO, Adelson Paulo. Resposta do feijoeiro comum à inoculação com rizóbio e suplementação com nitrogênio mineral em dois biomas brasileiros. Revista Brasileira de Ciência do Solo, Viçosa, v. 39, p. 1-12, 2015.