Abstract:
The study has been carried out in two different areas; a farmer area in Söke Plain and in experimental station of
Adnan Menderes University. The aims of study, are to determine of some physical and chemical properties of
the soils and to search of activity of gypsum (CaSO4) used in alkaline soils having high sodium. For this
purpose, 50,100 and 150 kg/da gypsum were applied to the experimental soils besides control. These
applications were made in autumn after harvest period and before the winter rains. In order to determine affects
of gypsum on some physical and chemical properties of the soils such as texture, pH, soluble salt content, lime,
EC, organic matter content, boron, aggregate stability, dispersion ratio, suspension and dispersion percent.
Disturbed and undisturbed soil samples were taken from 0-10,10-20,20-30, 30-40, 40-60, 60-90 cm depths in
May after spring rain and in September when the soils are drier. The obteined data taken from the analyses were
evaluated as statistically. The results showed that gypsum doses used as amelioration material are effective to
lead Na into soil solution by leaving from soil colloids. However this phenomenon was not found sufficient in
the soils of sesecond experimental area. Hence gypsum doses that will be used in soils having high alkalinity
should be higher and the soils should be washed with high quality water after gypsum treatment because of
unsufficient rains in the area.
