Pesquisa Agropecuária Brasileira
Print version ISSN 0100-204X
MUNIZ, Luciano Cavalcante et al. Soil biological attributes in pastures of different ages in a crop-livestock integrated system. Pesq. agropec. bras. [online]. 2011, vol.46, n.10, pp. 1262-1268. ISSN 0100-204X. http://dx.doi.org/10.1590/S0100-204X2011001000021.
The objective of this work was to evaluate the effect of the pasture (Urochloa brizantha) component age on soil biological properties, in a crop-livestock integrated system. The experiment was carried out in a Brazilian savannah (Cerrado) area with 92 ha, divided into six pens of approximately 15 ha. Each pen represented a different stage of the pasture component: formation, P0; one year, P1; two years, P2; three years, P3; and final with 3.5 years, Pf. Samples were taken in the 0-10 cm soil depth. The soil biological parameters - microbial biomass carbon (MBC), microbial biomass respiration (C-CO2), metabolic quotient (qCO2), microbial quotient (qmic), and total organic carbon (TOC) - were evaluated and compared among different stages of the pasture, and between an adjacent area under native Cerrado and another area under degraded pasture (PCD). The MBC, qmic and TOC increased and qCO2 reduced under the different pasture stages. Compared to PCD, the pasture stages had higher MBC, qmic and TOC, and lower qCO2. The crop-livestock integrated system improved soil microbiological parameters and immobilized carbon in the soil in comparison to the degraded pasture.
Keywords : metabolic quotient; microbial biomass carbon; microbial quotient; soil respiration.