Sistemas de preparo do solo e culturas de cobertura na produção orgânica de feijão e milho. II - Atributos biológicos do solo
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Data
2011
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Resumo
The influence of cover crops and their management on the maintenance of soil biological
quality in areas under organic production should be better understood. This study aimed to
determine the influence of the cover crops sunn hemp (Crotalaria juncea), pigeon pea (Cajanus
cajan (L.) Millsp), velvet bean (Mucuna aterrima), sorghum (Sorgum technicum), and fallow
on biological properties of soil under organic common bean and corn, in no-tillage (NT) and
conventional tillage (CT) systems. The study was conducted in Santo Antônio de Goiás-GO, on
an Oxisol, in a randomized block design, with four replications. Four experiments were installed
in November 2003, two of them under NT and the other two in CT. In each soil management
system, one experiment was carried out with common bean and another with corn. Samples
were taken from the layers 0.00–0.10 and 0.10–0.20 m in November 2007, in the plots and in
a neighboring native forest, to determine the soil organic carbon content (SOC), microbial
biomass carbon (MBC), soil basal respiration (SBR), metabolic quotient (qCO 2 ), and microbial
quotient (qMIC). The main changes in biological properties of soil under agricultural use
occurred in the surface layer, where, in general, the MBC values were lower than in forest soil,
a difference that was more pronounced in CT areas. The qCO 2 was sensitive to changes resulting
from soil tillage, with lowest values in the surface layer of NT soil.
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C orgânico do solo, Quociente microbiano, Carbono da biomassa microbiana, Quociente metabólico, Respiração basal do solo, soil organic carbon, Microbial biomass carbon, Microbial quotient, Soil basal respiration, Metabolic quotient
Citação
CUNHA, Eurâimi de Queiroz; STONE, Luís Fernando; FERREIRA, Enderson Petrônio de Brito; DIDONET, Agostinho Dirceu; MOREIRA, José Aloísio Alves; LEANDRO, Wilson Mozena. Sistemas de preparo do solo e culturas de cobertura na produção orgânica de feijão e milho. II - Atributos biológicos do solo. Revista Brasileira de Ciência do Solo, Viçosa, v. 35, n. 2, p. 603-611, 2011.