سال انتشار: ۱۳۸۷

محل انتشار: همایش بین المللی ژئولیت ایران

تعداد صفحات: ۶

نویسنده(ها):

Jahangir Abedi-Koupai – Associate Professor of Water Resources, Department of Irrigation, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
jafar Asadkazemi – Former Graduate Student, Department of Irrigation, College of Agriculture, IUT, Isfahan, Iran
saeid abedii – Geologist, Ministry of Industries and Mines
Farialreza Salimi – Graduate Student, Department of Irrigation, College of Agriculture, IUT, Isfahan, Iran

چکیده:

The use of alternative water holding amendments will become more important over time, especially in
regions with reduced water availability. The objectives of this study were to evaluate the effect of zeolite on
the growth indices of an ornamental plant (Cupressus arizonica) under reduced irrigation regimes in a field
trial and the effect of zeolite on soil water retention curve (WRC) in a laboratory trial. The RETC computer
program was used for obtaining optimal model parameters. Semnan and Firoozkouh zeolites in two levels, 4
and 6 g/kg, were mixed with two soil textures of clay and sandy loam. The results of the soil water retention
model showed that, zeolite caused the residual water content (θr) and saturated water content (θs) to
increase. Air entry value, (hb) was observed to decrease in the clay and increase in the sandy loam.. Available
water content (AWC) increases 60% more than that of the control at maximum, with zeolite application of 6
g/kg in sandy loam soil. The field trials was conducted as a split plot on the random complete blocks design
in which the main plot treatments were two irrigation regimes consisting 33% and 66% evapotranspiration
(ETc) and two sub-plot treatments were soil containing 4 and 6 g/kg zeolite. The control blocks had no
zeolite and irrigatedwith 100% evapotranspiration (ETc). The results indicated that plant height, shoot diameter and length of
green, are the same in treatment containing 4 and 6 g/kg zeolite and receiving irrigation water 66% ETc with
the control. Thus, application of 4 and 6g/kg zeolite reduced the required water 33% of the control.
Application of zeolite can result the enhancement of number of days to reach permanent wilting point
particularly for light soil texture.