A mixed-integer linear programming model was formulated to minimize the cost of transport and processing of excess manure in the Chesapeake Bay watershed. The results showed that primarily poultry manure was moved out of surplus counties for land application or processing. In the base model,...

With the Waxman-Markey Bill passing the House and the administration’s push to reduce carbon emissions, the likelihood of the implementation of some form of a carbon emissions policy is increasing. This study estimates the greenhouse gas (GHG) emissions of the six largest row crops...

This study investigates the possible use of climate forecasts by Pennsylvania Community Water System (CWS) managers for planning and decision making. The first phase involves analysis of data from a mail survey to identify managers most likely to use climate forecasts. The second phase uses...

Invasive alien plants are invading some 125 million hectares in South Africa and Lesotho. More than R800 million has been invested in the clearing of invading alien plants in South Africa since October 1995. These clearing operations have had huge environmental, social and economic benefits but...

The effect of spatial-scale variations on water harvesting has been evaluated at micro-catchment, hillside/farm, and watershed (=catchment) scales in three relatively dry environments in Syria, Pakistan and Egypt. Micro-catchment water harvesting captures localized runoff only through...

Effective management of invading alien plants in natural and semi-natural systems is imperative if we are to prevent enormous impacts. An integrated approach involving the combined use of a range of methods is usually necessary to control invasive alien plants effectively. The various methods...

The potential of a Spatial Decision Support System (SDSS) for estimating water and sediment yields was assessed in a large (92.46 km2) experimental catchment in the Damodar-Barakar basin. The SDSS is based on a SWAT model and was operated under prevailing resource management conditions....

Future food security can be achieved only by delivering substantial increases in agricultural production, but this has important implications for water availability. Water scarcity is not currently a major issue in sub-Saharan Africa, but it would be a mistake to neglect this issue. It would be...

Monitoring of five dairy farming catchment streams in New Zealand shows they have high concentrations of N and P forms and faecal indicator bacteria. Suspended solids (SS) concentrations are sometimes high because of poor riparian management. Trend analysis and specific yields of N, P and SS for...

We examined spatial patterns of physico-chemico characteristics and nutrients of freshwater lotic systems in impaired waters in sand river systems in a semi-arid tropical lowveld region of south-east Zimbabwe, from August 2003 to April 2004. These changes were viewed in the context effluent...