Data/hora: 11/06/2024 02:33:20

Provedor de dados: | 124
País: | Brazil
Título: | Microbial soil quality indicators under different crop rotations and tillage management
Autores: | Ferreira,Enderson Petrônio de Brito; Santos,Henrique Pereira dos; Costa,Janaina Ribeiro; De-Polli,Helvécio; Rumjanek,Norma Gouvêa.
Data: | 2010-06-01
Ano: | 2010
Palavras-chave: | Microbial biomass; Microbial respiration; Organic matter; Soil management.
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 (Cmic), basal soil respiration (BSR), metabolic quotient (qCO2), soil organic carbon content (Corg) and microbial carbon to organic carbon ratio (Cmic/Corg). 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&lt;0.05) and crop rotations were compared by Tukey test (p&lt;0.05). All data were submitted to multivariate analysis (Principal Component Analysis - PCA). There were observed significant differences ("t" test; p&lt;0.05) for Cmic, BSR, qCO2 and Cmic/Corg between NT and CT, by which NT values resemble those for forest area. For crop rotations significant differences (Tukey test; p&lt;0.05) were found only for BSR and qCO2. 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 Cmic and Cmic/Corg 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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902010000200002
Editor: | Universidade Federal do Ceará
Relação: | 10.1590/S1806-66902010000200002
Formato: | text/html
Fonte: | Revista Ciência Agronômica  v.41 n.2 2010
Fonte: | info:eu-repo/semantics/openAccess