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Abstract
A field experiment \\’as established at Abu Attwa experimental
station, Ismailia at the same location of Abu Attwa Waste Water
Treatment Plant to study the effect of Irrigation with treated sewage
l’nlUCl1t on soil and plant.
This experiment was cultivated with four crops (Wheat Broad bean,
Sunflower and sesame) at winter and summer seasons and irrigated \\i th
two kinds of treated sewage effluent i.e. primary and biologically treated
sewage effluent. All crops \\’ere cultivated without adding any organic or
chemical fertilizers, In order to use water in agriculture without negative
secondary effects. some chemical amendments such as gypsum. sul lur
and lime were added to the soil before cultivation to avoid hazardous
effects associated with this practice. The following data were obtained: 1-
The primary treated sewage effluent is chemically good for irrigation and
SAR was low that would not affect the suitability of this water and the
concentration of heavy metals was lower than the maximum permissible
.,
levels for irrigation.
2- The biologically treated sewage water was more suitable for irrigation
and it contained the lowest amounts of heavy metals.
3- The application of soil amendments, gypsum, sui fur and lime reduced
the CC value of the soil and increased the yield of seeds and straw for all
crops studied.
4- The yield of seed and straw which irrigated with pnmary treated
sewage water was higher than that obtained from crops irrigated with
biologically treated sewage water for all crops studied.
Application
1- Irrigation with treated sewage effluent for wheat, Broad bean,
Suntlower and sesame crops with the consideration of following soil
analyses to realize the accumulation of some heavy metals in the soil.
2- Soil amendments like gypsum, lime and sulfur should be added to the
soil before cultivai.on with the rate of 2500 kg, 1100 kg and 500 kg
IF addcn respectively to avoid the hazardous effect of using the treated
sewage eftluent on soil and plant.