Materials and Methods
The research areas (Figure 1), Karacahyk and
Bahecik, are 25 km and 35 km from the centre of
Eskißehir (latitude 39¡ 47', longitude 30¡ 31') towards
the east, respectively. Osmangazi University experiment
fields I (OGU I) and II (OGU II) are close (approx. 5 km)
to the centre of Eskißehir. According to the climatologic
data of the past 60 years the annual mean temperature in
this province is 10.8 ¡C. The mean temperature of the
hottest months (July-August) is 21 ¡C; the mean
temperature of the coldest months (January- February) is
-0.2 to 1.2 ¡C. Annual mean precipitation in the region is
25.3 mm and annual relative humidity is 67%. The
climatologic data were obtained from Eskißehir
Meteorology station.