Sustentabilidade de sistemas orgânicos com plantas de cobertura na cultura do arroz,por meio de alterações físicas do solo
Carregando...
Data
2010-06
Título da Revista
ISSN da Revista
Título de Volume
Editor
Evandro Novaes
Resumo
To evaluate the influence of cover crops on Oxisol
physical attributes, in an organic production system with
conventional tillage, a study was conducted at Embrapa Arroz
e Feijão, Santo Antônio de Goiás, Goiás State, Brazil, for two
years, in a succession cover crops-rice, in which cover crops
were sown in the autumn/winter and the subsequent crop, rice
cultivar Aimoré, was sown in the summer. Five cover crops were
used: Velvet bean (Mucuna aterrima), Sunn hemp (Crotalaria
juncea), Pigeon pea (Cajanus cajan), Broom sorghum
(Sorghum technicum), and spontaneous vegetation fallowing.
A randomized blocks design with four replications was used.
In the second year of experimentation (2005), soil samples
were collected from plots and from a close forest, at depths
of 0.00-0.10 m, 0.10-0.20 m, and 0.20-0.30 m, to determine
organic matter content (SOC), soil physical properties, S
index, and soil aggregation. The cover crops management was
carried out at the flowering stage and its biomass incorporated
into soil profile. For total porosity, microporosity and bulk
density, there were no significant differences among depths,
for different cover crops. For S index, for all treatments at
the 0.00-0.10 m layer depth, values between 0.020 and 0.035,
characterizing intermediate soil physical quality, were found.
The percentage of aggregates with a diameter larger than 2 mm
and the weighted average diameter of aggregates were higher
at the 0.10-0.20 m layer depth. SOC decreased with depth,
independently of cover crops.
Descrição
Palavras-chave
Plantas de cobertura, Preparo do solo, Porosidade, Estabilidade de agregados, Cover crops, Soil tillage, Porosity, Aggregate stability
Citação
AGUIAR, Renata Alves de; MOREIRA, José Aloísio Alves; STONE, Luís Fernando; BERNARDES, Tatiely Gomes; JESUS, Roberta Paula de. Sustentabilidade de sistemas orgânicos com plantas de cobertura na cultura do arroz,por meio de alterações físicas do solo. Pesquisa Agropecuária Tropical, Goiânia, v. 40, n. 2, p. 142-149, abr./jun. 2010. Disponível em: <https://www.revistas.ufg.br/pat/article/view/4843/6889>.