Abstract
The spatial distribution patterns of the nitrogen and phosphate input/intake amounts in crop production within rural area are examined, based upon a cropping units distribution map that is obtained through remote sensing data analysis. As a result, it is clarified that the distribution patterns of nitrogen inputs (by chemical fertilizer and compost) differ with months and the distribution pattern of annual phosphate inputs is not similar to that of annual phosphate intakes by crops. The distribution pattern of nitrogen balance of annual inputs and intakes shows that many farmlands of over intake are widely found in the area, although a few farmlands of over input at more than 100kg·ha-1·yr-1 are scattered. The distribution pattern of phosphate balance of annual inputs and intakes indicate that many farmlands of over input at more than 100kg·ha-1·yr-1 are found in center to north-west portions within the area. It is considered that examinations on spatial distribution of nutrient inputs and intakes in the process of crop production are effective to study regional material flows for watershed environmental management.
