Encontrados 15 documentos, a visualizar página 1 de 2
Below ground interactions for sustainable cropping systems.
Goss, Michael J.; Brito, Isabel; Carvalho, Mário; Kadir, S.; de Varennes, A.Key aspects of cropping systems are described in terms of their impacts on soil, water and air resources. The importance of microbial symbiotic relations with crop plants are briefly considered in the context of nutrient resource use efficiency and the resilience of plants to biotic and abiotic stress. It is argued that cropping systems need to include crops with fibrous root systems and legumes in the rotation...
Comparação de correctivos aplicados a um solo de uma área mineira contaminado c...
Madeira, A.C.; Esteves, C.; Abreu, M.M.; Varennes, A.; Magalhães, M.C.F.Three amendments (iron oxides, Fe; organic matter, MO; calcium phosphate, PCa) were applied to a naturally contaminated soil with arsenic and their effect on the growth of tomato plants and Italian parsley was studied. The results indicate differences associated with the availability of arsenic in the soil in the presence of amendments: Fe had no influence on arsenic availability compared with the unamended soi...
Recovery of burned forest soil by organic residue application - substrate induc...
Cordovil, C.; Varennes, A.; Pinto, R.RAMIRAN International Conference ; The Mediterranean is one of the most vulnerable regions to climatic changes. One of the impacts of these changes is a substantial increase in the meteorological risk of fire. The forest fire regime instantaneously responds to climatic changes and may become the dominant factor of alteration in forest communities (Santos & Miranda, 2006). Therefore, understanding the impact of...
Shifts in the structure of a mine contaminated soil (Pb, Cu, As) following diff...
Cordovil, C.; Varennes, A.; Basanta, R.; Baath, E.; Diaz-Ravina, M.RAMIRAN International Conference ; Soil microbial community structure is increasingly being marketed as ecologically-relevant endpoint and it can realistically be incorporated for assessing the potential risks associated with anthropogenic disturbances and soil amendment strategies on sustainability of soil ecosystems. In Portugal, additional research is needed if technologies based on the combined action of p...
Use of hydrophilic polymers from disposable diapers to restore metal contaminat...
Varennes, A.RAMIRAN International Conference ; Hydrophilic polymers swell to form gels that contain many times their dry weight in water. They are marketed as ‘superabsorbent polymers’, with different trade names, for incorporation into soils and substrates. YunKai et al. (2002) reviewed the effects of these polymers on agricultural soils and crops. Another use of hydrophilic polymers is in disposable diapers and similar ...
Evaluation of amendments in the rehabilitation of sulfide mine tailings from Sã...
Abreu, M.M.; Varennes, A.; Santos, E.S.; Macias, F.RAMIRAN International Conference ; The São Domingos mining area is located in the Iberian Pyrite Belt, SE Portugal, and represents a serious environmental hazard (Matos and Martins, 2006). Exploitation dated back to pre-roman and roman times with extraction of Ag, Au and Cu exploitation, mainly in the gossan (resulting from the ore weathering). The intense exploitation started in the middle of 19th century, bo...
Use of organic residues in the recovery of organic matter pools, after forest f...
Cordovil, C.; Varennes, A.; Fernandes, R.C.RAMIRAN International Conference ; In Portugal, as in other Mediterranean countries, fire events are common primarily due to climate and progressive rural abandon, and contribute largely to desertification. Top layers of soil are constituted mostly by organic residues and decomposed organic matter, and are the most sensitive layers to fire damages. Soil organic matter is an important factor on physical, chemic...
Microbial characterization of a mine soil subjected to different remediation te...
Varennes, A.; Basanta, R.; Baath, E.; Diaz-Ravina, M.RAMIRAN International Conference ; In Portugal, additional research is needed if technologies based on the combined action of plants and the microbial communities they support within the rhizosphere are to be adopted in large-scale remediation actions (Nabais et al., 2008). Plants growing in abandoned mines are useful to indicate the mineral composition of the soil and they are able to accumulate or exclude to...
Microbial community structure in a unlimed and limed mine contaminated soil (Pb...
Varennes, A.; Basanta, R.; Baath, E.; Diaz-Ravina, M.RAMIRAN International Conference ; Mine contaminated soils are very unfavourable environments with limiting factors, in particular residual high levels of heavy metals, soil acidity, lack of organic matter and poor substrate structure. Toxic effects of HM on soil microorganisms have been extensively studied (Frostegård et al., 1993; Bååth et al., 1998) and the measurements of community structure indicated that...
O azoto no crescimento e na produtividade de jovens pereiras 'Rocha'
Varennes, A.; Neto, C.; Carranca, C.; Rocha, I.; Sobreiro, J.; Clemente, J.Pear trees (Pyrus communis L. ‘Rocha’) grafted on quince ‘BA29’ were planted in February of 2003 at “Pêro Moniz” (“Cadaval”, Portugal) and drip-fertigated for three years with four N levels (0, 10, 20 and 40 kg N/ha per year) using ammonium nitrate. At planting and at the end of each season, tree height (A), trunk cross sectional area (AST) and the number of shoots and shoot length (NL and CL) were determined. ...
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