Revista Brasileira de Engenharia Agrícola e Ambiental
On-line version ISSN 1807-1929
COLODRO, Gilberto; ESPINDOLA, Carlos R.; CASSIOLATO, Ana M. R. and ALVES, Marlene C.. Microbial activity in a degraded Latosol treated with sewage sludge. Rev. bras. eng. agríc. ambient. [online]. 2007, vol.11, n.2, pp. 195-198. ISSN 1807-1929. http://dx.doi.org/10.1590/S1415-43662007000200010.
The degraded soil shows, in general, poor biological activity, considering its physical characteristics, low fertility and organic matter, mainly due to removal or degradation of its superficial layer. The sewage sludge, due to its high content of easily decomposed organic matter can be an alternate source of organic residues and combined to its high content of the principal nutrients for the plants can be an important factor to promote biological activities in degraded soil. In order to study the actions of the sewage sludge in the recovery of a degraded Latosol, the carbon in the microbial biomass (Cmic), the carbon released CO2 (C-CO2) and the relation between microbial and organic carbon (Cmic/Corg) were used as indicators of the effects. To do so, two doses (30 and 60 Mg ha-1) of sewer slime applied in topdressing and incorporated together with a mineral fertilizer treatment, using the eucalyptus as a test crop. A completely randomized design with 4 treatments and 4 repetitions was used. The sewage sludge promoted increase of liberated C-CO2 and the Cmic, which constitute the adequate quality indicators for monitoring the soil recovery.
Keywords : carbon of released CO2; carbon in the microbial biomass; biossolid.