The study was conducted in 2011 on 6-years-old citrus trees "Washington navel
141". It contained four treatments with three replicates for each treatment. The results
showed that:
The wastewater treatments showed superiority on the control in the
number of
vegetative growth and its length.
The number of inflorescence buds, was increased in the second treatment (irrigation
with 50% treated wastewater +50% normal water) (5. 37) which dominated the other
treatments.
The weight of fruit was affected by treated wastewater irrigation. Second treatment
(irrigation with 50%treated wastewater+50 % normal water) was better than the control
treatment. It was increased by (308. 3 g) compared to (259. 5 g) for the control treatment.
Fruit yield production per tree, was increased by second treatment (irrigation with
50% treated wastewater+50 % normal water) (28. 9kg) compared to (15. 3kg) for the
control.
Treated wastewater irrigation had positive effects in the quality of fruit
(Total sugar %), (T. S. S %) and the coefficient of maturity were increased in second and
third treatment compared to other treatments, while (T. A %) was decreased in all
wastewater treatments.
Treated wastewater which comes from Adra Treatment Station is used for
irrigating a part of the agricultural lands at Damascus Eastern Ghota after
transferring it by a set of canals constructed for this purpose, Figure No. (1),
its area estimated
about 18000 hectares in addition to the adjacent areas for
comparison object, the irrigated land by this project is forming the main study
object of this research.
This area is considered as the most affected area by the agricultural and
industrial activities, increasing of population development due to its natural
resources on one side and its location near the capital of Damascus on the other
hand. The mean value of wastewater volume coming to the station has been
estimated at 485000 m3 per day [1]. Therefore, this project is considered as one
of the important projects which ensure an additional water resources for that
area where water demand increased specifically against decreasing water
resources of formerly years of aridity which considered as one of its reasons.
From this point, this research is aimed at clearing out quality changes
happened in the groundwater in the Eastern Ghota area which affected with
irrigation by treated water, that was due to observing the quality changes of
groundwater through a grid of wells and processing these analysis results by
making maps, diagrams, and graphs; then comparing them with adjacent areas
data, and to read out of these changes and reach knowledge of irrigation effect
range by this water on the groundwater quality.
