Soil and crop residue CO2-C emission under tillage systems in sugarcane-producing areas of southern Brazil

Appropriate management of agricultural crop residues could result in increases on soil organic carbon (SOC) and help to mitigate gas effect. To distinguish the contributions of SOC and sugarcane (Saccharum spp.) residues to the short-term CO2-C loss, we studied the influence of several tillage systems: heavy offset disk harrow (HO), chisel plow (CP), rotary tiller (RT), and sugarcane mill tiller (SM) in 2008, and CP, RT, SM, moldboard (MP), and subsoiler (SUB) in 2009, with and without sugarcane residues relative to no-till (NT) in the sugarcane producing region of Brazil. Soil CO2-C emissions were measured daily for two weeks after tillage using portable soil respiration systems. Daily CO2-C emissions declined after tillage regardless of tillage system. In 2008, total CO2-C from SOC and/or residue decomposition was greater for RT and lowest for CP. In 2009, emission was greatest for MP and CP with residues, and smallest for NT. SOC and residue contributed 47 % and 41 %, respectively, to total CO2-C emissions. Regarding the estimated emissions from sugarcane residue and SOC decomposition within the measurement period, CO2-C factor was similar to sugarcane residue and soil organic carbon decomposition, depending on the tillage system applied. Our approach may define new emission factors that are associated to tillage operations on bare or sugarcane-residue-covered soils to estimate the total carbon loss

Dynamic identification of a strategic building of the sixties with a mixed structure

The present paper shows and discusses the results of the identification procedure applied to the building of the Municipality of Castellaneta, Taranto (Puglia, Italy). The case study has been chosen for its structural complexity; indeed, the building has been built in two successive phases, block A built between 1955 and 1957, and block B, for completion, presumably built between the years 1960 and 1961. Block A constitutes the main building and represents the original nucleus. The structure was subsequently subject to structural interventions to replace some load-bearing walls with steel beams. The building constituting block B, joined to the original body of the building, has a structure in load-bearing masonry, while the floors, more recently built, are also in brick-concrete, but with pre-cast prestressed joists. The dynamic response of the building was assessed through OMA (Operational Modal Analysis) identification technique which allows you to determine the properties of the structure in real operating conditions, without the need to interrupt the activities inside the structure itself. The structural excitement, therefore, is due only to the environmental condition. A 3D model was defined in PRO_SAP; the results obtained from the finite element model were subsequently compared with those obtained from the experimental model

Variações diurnas da emissão de CO2, temperatura e umidade do solo sobre diferentes manejos pós-colheita da cana-de-açúcar.

bitstream/item/69062/1/098-moitinho-variacoes.pdfPublicado também no Cadernos de Agroecologia, v. 7, n.2, 2012

Avaliação do desempenho de adubos verdes antecedendo o plantio de milho, em agroecossistema sob bases ecológicas, Utilizando-se análises multivariadas.

bitstream/item/68818/1/021-moitinho-avaliacao.pdfPublicado também no Cadernos de Agroecologia, v. 7, n. 2, 2012

Desempenho de variedades de cana-de-açúcar consorciadas com Crotalaria juncea sob manejo ecológico em solo de Cerrado, em Dourados, Mato Grosso do Sul.

Publicado também na: Revista Brasileira de Agroecologia, v. 6. n. 2, dez. 2011

Desempenho da cultura do feijão-caupi sob efeitos de adubos verdes em Itaquiraí, Mato Grosso do Sul.

bitstream/item/68912/1/043-moitinho-desempenho.pdfPublicado também no Cadernos de Agroecologia, v. 7, n.2, 2012