Punjab faces a sever problem of declining water tables by as much as 10 – 15m in most parts. The paper focuses on groundwater behavior in various parts (Blocks) of the Punjab in categories of low to high rainfall regions, saline to sweet groundwater zones, scanty to extensive canal water...

This study investigates the optimal agricultural land use allocation and nitrogen application to arepresentative Japanese farm. The site-specific nature of numerous agri-environmental issues necessitates analysis ata disaggregated level in order to capture the underlying heterogeneity of...

In order to eliminate the limitations of conventional field-scale observation methods for non-point source (NPS) pollution, this paper proposes a direct method to observe NPS pollution from paddy fields. The evapotranspiration (ET) and infiltration loss hydrographs of paddy fields in different...

To investigate the greenhouse gases emissions from paddy fields, methane and nitrous oxide emissions were estimated with the local measurement and the IPCC method during 1990–2006 in Taiwan. Annual methane emission ranged from 9001 to 14,980ton in the first crop season for 135,314–242,298ha...

The soil and water assessment tool (SWAT) is becoming a popular tool for modeling watershed-scale hydrological and chemical transport in Asia, where paddy rice is cultivated in typical agricultural management systems. In this study, a paddy module was developed by modifying an algorithm designed...

This study investigates the optimal agricultural land use allocation and nitrogen application to a representative Japanese farm. The site-specific nature of numerous agri-environmental issues necessitates analysis at a disaggregated level in order to capture the underlying heterogeneity of...

Anthropogenic activities have exerted increasingly large-scale influences on terrestrial ecological systems from the past century, primarily through agriculture; however, the impact of such changes on the hydrologic cycle is poorly understood. As one of the important land use (LU) in the coastal...