الفهرس 
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Abstract
The aim of this work was study the effect of reusing treated wastewater on some soil properties and the growth of plants grown thereon under different irrigation systems. To fulfill the aim of the study two experiments were carried out; the first is a pot experiment and the second is a landscape one.
5.1. The first experiment (pot experiment):
A pot experiments was carried out under greenhouse conditions, of Soil, Water and Environment, Research Institute (SWERI), Agricultural Research Center (ARC), to study the effect of application of some organic manures i.e. farmyard manure and water hyacinth compost as soil conditioners on some properties of sandy and calcareous soils and on the growth of maize plants grown thereon under irrigation with fresh Nile water and low quality water (treated wastewater) applied by surface and subsurface irrigation systems. Two surface (0 – 15cm) soil samples were collected; the first was sandy from Ismailia and the second was sandy clay loam from Nubaria. Maize (Zea maize) seeds (Hybrid singles 30 K8) were cultivated, at a rate of ten seeds per pot. After fifty days from sown plant were harvested and the dry weight shoots was recorded. Plant samples were digested and analyzed for N, P, K, Fe, Mn, Zn, Pb, Ni and Co determination. At the end of the experiment soil samples were collected from each pot for the determination of soil properties.
The obtained results could be summarized as follows:
-Application of farmyard manure and water hyacinth compost and irrigation with treated wastewater or fresh Nile water under surface and subsurface irrigation systems increased total porosity in both soils consequently, decreased soil bulk density for both soils under study.
- Soil hydraulic conductivity decreased in the sandy soil whereas increased in the calcareous one as a result of the application of organic manures and the irrigation with treated wastewater or fresh Nile water under surface and subsurface irrigation systems.
- Soil salinity increased whereas the pH of both soils slightly decreased as a result of the application of organic manures and irrigation with treated wastewater and fresh Nile water under surface and subsurface irrigation systems.- Application of organic manures and irrigation with treated wastewater and fresh Nile water under surface and subsurface irrigation systems increased the available content of N, P K, Fe, Zn and Mn in the both soils.- Application of organic manures and irrigation with treated wastewater and fresh Nile water under surface and subsurface irrigation systems increased the accumulation of some heavy metals (Pb, Ni and Co) in both soils, especially, in the case of the application of water hyacinth compost and irrigation with treated wastewater under surface irrigation system; the accumulation of these elements in the calcareous soil were higher than in the sandy soil.
- The dry matter yield and N, P K, Fe, Mn, and Zn uptake by maize plants grown on both soils increased as a result of the application of organic manures and irrigation with treated wastewater and fresh Nile water under surface and subsurface irrigation systems.