Microbial soil quality indicators under different crop rotations and tillage management
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Data
2010-06
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Resumo
An experiment was carried out under field conditions to assess the effects of soil management (no-tillage- NT and
conventional tillage- CT) and crop rotation systems on microbial biomass-C (C mic ), basal soil respiration (BSR), metabolic
quotient (qCO 2 ), soil organic carbon content (C org ) and microbial carbon to organic carbon ratio (C mic /C org ). Soil samples were
collected on an area cultivated with wheat as winter crop and soybean as summer crop, both in rotation with vetch, maize and
oats. Samples were also collected in a secondary forest used as reference. Data of each management system (NT and CT) were
compared to forest area by “t” test (p<0.05) and crop rotations were compared by Tukey test (p<0.05). All data were submitted
to multivariate analysis (Principal Component Analysis - PCA). There were observed significant differences (“t” test; p<0.05)
for C mic , BSR, qCO 2 and C mic /C org between NT and CT, by which NT values resemble those for forest area. For crop rotations
significant differences (Tukey test; p<0.05) were found only for BSR and qCO 2 . The sum of the two first principal components
on the PCA explained about 75% of the data variation. PCA showed NT closest to forest area than CT, especially treatments
with soybean and vetch as consecutive crops. The forest area-NT clustering was mostly due to C mic and C mic /C org relationship.
Results indicate that the NT system is more sustainable than the CT system and can contribute for the accumulation a greater
quantity of carbon in soil.
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Microbial biomass, Organic matter, Microbial respiration, Soil management, Biomassa microbiana, Matéria orgânica, Respiração microbiana, Manejo do solo
Citação
FERREIRA, Enderson Petrônio de Brito; SANTOS, Henrique Pereira dos; COSTA, Janaina Ribeiro; De-Polli, Helvécio; RUMJANEK, Norma Gouvêa. Microbial soil quality indicators under different crop rotations and tillage management. Revista Ciência Agronômica, Fortaleza, v. 41, n. 2, p. 177-183, Apr./Jun. 2010.