Establishment of leucaena in Australia

Leucaena (Leucaena leucocephala ssp. glabrata) is a highly productive tropical perennial legume used primarily in extensive beef grazing systems across northern Australia. Its productivity provides substantial benefits to grazing businesses and economically significant areas of leucaena have been established in Queensland, with much smaller areas in both the Northern Territory and Western Australia. Specific environmental conditions (particularly soil type) and management practices are required to obtain reliable establishment and high productivity from leucaena-grass grazing systems. Significant research, development and extension have been undertaken in northern Australia, particularly in central Queensland, resulting in management packages which ensure establishment reliability and long-term productivity. However expansion into new areas can be constrained by regionally-specific establishment issues. Adaptation of known establishment and management practices together with research and development are required for leucaena-grass grazing systems in new regions

'Redlands for Regions': Producer demonstration sites of psyllid-resistant leucaena across north Queensland

Leucaena, a tree legume with potential to greatly improve cattle performance, has not been readily adopted in northern Queensland primarily due to prevalence of the psyllid (Heteropsylla cubana) insect in higher rainfall zones. Psyllids reduce edible biomass in leaves by 40–52%, combined with a 46–83% reduction of stem yield (Bray and Woodroffe 1991). Losses to the Central Queensland beef industry due to psyllid impact on animal performance are estimated at $2 M per year (Mullen et al. 1998). Cultivar Redlands is a psyllid-resistant leucaena variety recently developed by Meat and Livestock Australia (MLA) and the University of Queensland

The cytoprotective drug amifostine modifies both expression and activity of the pro-angiogenic factor VEGF-A

Peer reviewedPublisher PD

Les transports en suspension de la Meuse, l'Ourthe et la Hoegne

Des échantillons d'eau ont été prélevés dans la Meuse à Liège, dans l'Ourthe à Liège et à Esneux et dans la Hoëgne à Theux, principalement au moment des crues. A partir de ces échantillons, la charge en suspension de chacune de ces rivières a été mesurée par filtration et les matières recueillies sur les filtres ont été analysées pour déterminer l'importance des matières organiques. Des droites de régression unissant le débit et d'une part la charge en suspension, et d'autre part la quantité de matières organiques ont été calculées. Ces relations varient systématiquement en fonction de l'importance des cours d'eau. La comparaison entre les données que nous avons recueillies et celles qui avaient été publiées pour la Meuse à Liège par W. Spring et E. Prost en 1883 montre que la charge en suspension transportée par le fleuve à Liège a probablement triplé depuis un siècle. Cet accroissement résulte principalement de l'endiguement du fleuve qui a supprimé tout débordement, et donc toute sédimentation dans la plaine alluviale à l'aval de Namur.Samples of water were collected mainly during floods from the Meuse and the Ourthe rivers at Liège, the Ourthe river at Esneux and from the Hoëgne river at Theux. The concentration of suspended matter was determined by filtration, while the organic matter was measured in the sediments deposited on the filters. Regression lines were obtained for the relationship between discharge and bath the suspended matter and the organic matter contents for each location. They were found to vary systematically with the size of the river. Comparison of the results with those obtained from the river Meuse at Liège by W. Spring and E. Prost (1883) suggests the amount of suspended matter appears to have tripled in one century. This is ascribed to the elimination of flooding of the alluvial plain by man made levees