236
R. Orthofer and W. Loibl
D Target area
o Water relevant area
Nitrogen load kg/ha
0-10
10 -100
100 - 200
200 - 500
500 - 2700
o
10
20 Kllometers
~~iiiiiiiiI
Fig. 2. Nitrogen input into soils from rainfall, fertilizer use, irrigation with nitratecontaining groundwater and wastewater, seepage from waste dumps and fish ponds, and
discharge of domestic wastewater disposal. (Nitrogen inputs in the eastern WRA are
incomplete due to partially missing data). The nitrogen inputs follow mainly the patterns of
intensive agriculture