48 documents found, page 1 of 5
Mineralização de azoto de diferentes resíduos orgânicos em incubação laboratori...
Carneiro, J. P.; Branco, S.; Coutinho, J.; Trindade, H.O objectivo do presente trabalho foi determinar, em condições laboratoriais e através de um ensaio de incubação de longa duração (443 dias), a mineralização do N orgânico resultante da incorporação de lamas de depuração, compostado de resíduos sólidos urbanos (RSU), chorume de bovinos e lamas celulósicas, num Solo Litólico de granito. À excepção das lamas celulósicas (80 kg N ha-1), os resíduos orgânicos foram ...
Produção de azoto mineral durante a compostagem de fracção sólida de chorume da...
Brito, L. M.; Mourão, I.; Trindade, H.; Coutinho, J.A fracção sólida do chorume (FSC) de duas explorações de pecuária leiteira intensiva foi compostada: (i) em 2004, sobre o solo, incluindo, ou não, palha, e com diferentes níveis de revolvimento; e (ii) em 2005, sobre uma tela de cobertura do solo, com e sem revolvimento, com diferentes coberturas e diferentes volumes. O teor de matéria seca (MS) da FSC da primeira exploração (30%) apresentou um valor superior, ...
Effects of biochar inclusion on in vitro rumen fermentation parameters
Rodrigues, A.; Maia, M.; Cabrita, A.; Oliveira, H.; Bernardo, M.; Fonseca, I.; Trindade, H.; Pereira, José Luís; Fonseca, A.
Assessment of net nitrogen mineralisation from repeated applications of cattle-...
Pereira, J.; Coutinho, J.; Trindade, H.The aim of our study was to evaluate the impact of repeated applications of cattle-slurry and mineral fertiliser on net N mineralisation rates in a Mediterranean forage system, cropped with maize silage (spring-summer) followed by Italian ryegrass (autumn-winter) for silage. The field study was performed between May-1997 and May-2000 in a commercial dairy-cattle farm located in Northwest Portugal. Five treatmen...
Dairy cattle-slurry treatment technologies: towards an integrating approach of ...
Rodrigues, A.; Gomes, A.; Ferreira, L.; Trindade, H.; Fonseca, A.; Pereira, J.Dairy cattle farms have a well-known environmental impact that affects all ecological compartments: air, soil, water and biosphere [1]. Dairy cattle farming are a significant source of anthropogenic gases from enteric fermentation, manure storage and land application, mainly ammonia (NH3), nitric oxide (NO), nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4). The emission of such gases represents not o...
Composting of different agro-food wastes: Effects of the phenolic and lignocell...
Santos, C.; Fonseca, J.; Coutinho, J.; Ferreira, L.; Pereira, J.; Trindade, H.Currently, society faces a number of challenges related to the large amounts of organic wastes generated and accumulated by the increasing expansion of agroindustrial activities1. Most of these wastes are rich in lignocellulosic compounds, which represents a major fraction of all plant biomass (of above 90%), so, its degradation is crucial for global carbon cycle2. These organic wastes may be introduced directl...
Nitric oxide and nitrous oxide emissions from cattle-slurry and mineral fertili...
Pereira, J.; Coutinho, J.; Fangueiro, D.; Trindade, H.The application of organic and mineral fertilisers to soil can result in increased gaseous emissions to the atmosphere such as nitric oxide (NO) and nitrous oxide (N2O) gases. The aim of this study was to evaluate under laboratory conditions the effects on mineral N dynamics and NO and N2O emissions of application to soil of cattle slurry derived liquid fraction (LF) obtained by screw press and mineral fertilis...
Impact of the intensity of milk production on ammonia and greenhouse gas emissi...
Pereira, J.; Trindade, H.The aim of this study was evaluate the relationship between the intensity of milk production for a wide range of Portuguese commercial cattle farms and NH3 and greenhouse gas (GHG) emissions from manure management and enteric fermentation. A survey was carried out at 1471 commercial dairy cattle farms (Holstein-Friesian) and the NH3, N2O and CH4 emissions at each stage of manure management were estimated as wel...
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...
Técnicas de aplicação de chorume no solo e eficiência do uso do N pelas culturas
Carneiro, J.; Soares, D.; Monteiro, J.; Surgy, S.; Pereira, J.; Coutinho, J.; Trindade, H.; Fangueiro, D.Técnicas de aplicação de chorume ao solo e eficiência do uso do N pelas culturas