Evaluating River Water Quality through Land Use Analysis and N Budget Approaches

Abstract

Increase of reactive nitrogen associated with production of food and feed has increased N load into aquasphere and atmosphere. This has induced the problems such as eutrophication, acidification and global warming. What will be going on in future? In order to predict it and to mitigate food production managements, monitoring of N loads in various scales is required. How shall we conduct them? This paper will focus its discussion on the monitoring of NO3--N load from soils based on the previous studies which were conducted in the different scales, such as soil structure level, field level and basin level.