168
Discussion
E
u
I
l·Q_
LU
Q
CONCENTRATION OF WATER EXTRACT meq/l
50
100
100
200
300
200
J
Fig. 1. Increase in salinity of a fallow saline soil over one year due to evaporation from shallow
groundwater. (Abu Ghraib, Lower Mesopotamian Plain, Iraq). Concentrations expressed as mg/1
for a soil-water extract 1:5.
Λ
AIR
V
SOIL
b-=-GROUNDWATER:-=-:
Fig. 2. Flow pattern of the water and salt movement in a soil with a shallow groundwater table
(after Doering et al., 1964).