11 documents found, page 1 of 2
Impact of agricultural practices, elevated temperature and atmospheric carbon d...
Figueiredo, N.; Carranca, C.; Goufo, P.; Pereira, J.; Trindade, H.; Coutinho, J.Data on the movements of available N and non-exchangeable NH4 + in the soil are of crucial importance in designing an efficient plant N nutrition management scheme in paddy rice fields. To investigate the processes affecting the dynamics of N and pH under Mediterranean conditions, rice (Oryza sativa L. cv. Ariete) was cultivated in 2011 and 2012 in Salvaterra de Magos (central Portugal) under the following clim...
Elevated carbon dioxide and temperature effects on rice yield, leaf greenness, ...
Figueiredo, N.; Carranca, C.; Trindade, H.; Pereira, J.; Goufo, P.; Coutinho, J.; Marques, P.; Maricato, R.; de Varennes, A.Abstract The present field experiment was conducted during two consecutive cropping seasons in central Portugal to study the effects of simultaneous elevation of carbon dioxide concentration ([CO2]) (550 lmol mol-1 ) and air temperature (?2–3 C) on japonica rice (Oryza sativa L. ‘‘Ariete’’) yield, crop duration, and SPAD-values across the seasons compared with the open-field condition. Open-top chambers were us...
Rice (Oryza sativa L.) phenolic compounds under elevated carbon dioxide (CO2) c...
Goufo, P.; Pereira, J.; Moutinho-Pereira, J.; Correia, C.; Figueiredo, N.; Carranca, C.; Rosa, E.; Trindade, HPrevious studies have shown that elevated levels of carbon dioxide [CO2] may increase, decrease, or have no effect on the concentrations of phenolic compounds in plants. The underlying causes of these variations in responses remain poorly understood. In the present study, it was hypothesized that different plant responses come mainly from the duration of exposure to the gas, growing conditions, and sampling pro...
Effect of elevated carbon dioxide (CO2) on phenolic acids, flavonoids, tocopher...
Goufo, P.; Pereira, J.; Figueiredo, N.; Oliveira, M.; Carranca, C.; Rosa, E.; Trindade, H.There have been no studies conducted with the objective of investigating the effect of elevated CO2 concentrations ([CO2]) on antioxidants in grains. Therefore, a two-year field experiment was conducted using open-top chambers with two levels of atmospheric CO2 (375 and 550 mmol/mol) to evaluate their effects on rice grain antioxidants. Following exposure to high [CO2], the total phenolic content of all rice mil...
A dinâmica do azoto mineral no solo e na lâmina de água, em resposta a diferent...
Figueiredo, N.; Trindade, H.; Pereira, J.; Coutinho, J.; Goufo, P.; Prazeres, A.; Marques, P.; de Varennes, A.; Carranca, C.
O cultivo do arroz em Portugal e a resposta do agrossistema às alterações ambie...
Figueiredo, N.; Menino, R.; Prazeres, A.; Fareleira, P.; Vargues, A.; Carranca, C.; Marques, P.; Pereira, J.; Goufo, P.; Trindade, H.; Carneiro, J.
Effects of elevated temperature and atmospheric carbon dioxide concentration on...
Pereira, J.; Figueiredo, N.; Goufo, P.; Carneiro, J.; Morais, R.; Carranca, C.; Coutinho, J.; Trindade, H.Methane (CH4) and nitrous oxide (N2O) emissions from flooded rice fields have been rarely measured in Europe. A field study was carried out in an intermittent flooded rice field at central Portugal to investigate if global warming under Mediterranean conditions, elevated soil temperature (þ2 $C) and atmospheric [CO2] (550 ppm), could lead to significant effects in CH4 and N2O emissions. The experimental design consis...
Produção e valores de SPAD na cultura do arroz
Figueiredo, N.; Carranca, C.; Trindade, H.; Pereira, J.; Goufo, P.; Coutinho, J.; Marques, P.; Maricato, R.; de Varennes, A.
Proposta de novos factores de emissão de gases com efeito de estufa para a cult...
Pereira, J.; Figueiredo, N.; Goufo, P.; Carneiro, J.; Morais, R.; Carranca, C.; Coutinho, J.; Trindade, H.
Relatório Final do Projeto PTDC/AGR-AAM/102529/2008 “Emissões gasosas medidas e...
Carranca, C.; Figueiredo, N.; Fareleira, P.; Vargues, A.; Prazeres, A.; Marques, P.; Trindade, H.; Coutinho, J.; Pereira, J.; Moreira, N.; Goufo, P.Os objetivos do estudo foram os seguintes: i) avaliação da dinâmica do azoto (N) em cada talhão, e na lâmina de água à superfície dos solos, durante os ciclos culturais do arroz, ii) avaliação da mineralização potencial do N nos solos, em condições aeróbias e anaeróbias, simulando o período cultural (25 ºC) e pós-colheita (10 ºC), iii) avaliação das actividades enzimáticas, biomassa microbiana e presença de cia...