الفهرس 
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Abstract
The current investigation aims to study the effect of using one of the modern systems in the treatment of groundwater salinity and examine the effect of the groundwater irrigation on the quality of soil and some crops before and after treatment with magnetic system.
The present investigation was started with samples collection in June 2014. These samples were collected from two farms, the first one in Wadi El-Natrun (4 km Wady El-Natrun Road – Elalamin Marina Entrance, El- Beheira, Egypt), the second in El-khatatba (Mudug Abu El-Azaim, Cairo Alexandria Desert Road, El-Menoufia, Egypt). The samples were subjected to study the impact of irrigation with saline ground water treated with magnetic field on soil characteristics and some plants growing in this soil.
Four water samples were collected as follows:
from Wadi El-Natrun farm: Samples were collected from well (before and after exposure to magnetic field).
from El-khatatba farm: Samples were collected from well (before and after exposure to magnetic field).
To determine the impact of magnetic field on water samples. The results of the samples including pH, EC, heavy metals and major anions and cations.
The result of water analyses revealed that the pH values of all water samples were at the neutral side and there was an effect of the magnetic field on it. The EC values at all water samples were moderately saline and also data showed that (EC and TDS) slightly decreased after exposure to magnetic field. Soluble ions in the water are affected by exposure to magnetic fields. The element variations in response to magnetic field appeared to be variable. Concentrations of Fe slightly decreased after exposure to magnetic field while Concentrations of (Cu, Zn, Mn) were not changed after exposure to magnetic field in both farms.
Soil and plant samples were collected from representing areas irrigated with two different sources of water (treated and untreated water) from Wadi El-Natrun and El-khatatba. In both farms; three soil profiles were dug to the depth of 90 cm and soil samples were collected from successive depth (0-30, 30-60 and 60-90 cm), to study the impact of magnetized water on soil chemical characteristics in addition to study the effect of magnetized water on some characteristics of grapes crop from El-khatatba farm and tangerine crop from W adi El-Natrun farm and nutrients content in leaves. The results indicated that irrigation with magnetized water led to a decrease in pH values in both farms at different depths comparing with soils irrigated with un-magnetized water. Also data show that EC and soluble ions values in the studied soils decreased with increasing soil depth. Irrigation with magnetized water led to a decrease in EC and soluble ions contents in both farms at different depths comparing to soils irrigated with un-magnetized water. The amount of available Fe, Cu, Zn and Mn in different layers of the studied soil profiles were slight increase in soil irrigated with magnetized water compared with soil irrigated with un-magnetized water in both farms.
Plant results indicated that fresh and dry weights of grape and tangerine leaves were higher in plants irrigated with magnetized ground water than those grown without magnetic treatment. Also data showed significant increase in photosynthetic pigment fractions (chlorophyll a&b) in both grape and tangerine leaves irrigated with magnetic water, while low chlorophyll content in leaves of crops not subjected to magnetic treatment.
Proline content increased significantly in leaves of both grape and tangerine crops after magnetic treatment.
Total phenols in grape fruits increased significantly after magnetic treatment while in tangerine fruits results before and after treatment were very close showing no significant difference.
Application of magnetic water increased significantly total soluble sugars % and total soluble solids % in both grape fruits and tangerine fruits compared to those irrigated with non-treated water.
Irrigation with magnetized water reduced acidity % in both grape fruits and tangerine fruits.
Data indicated that irrigation of grape and tangerine leaves by magnetic water exhibited an increase in (macro nutrient) nitrogen, potassium and phosphorous contents and (micro nutrient) iron, manganese, copper and zinc contents compared with leaves irrigated with nonmagnetic water.
Key words: Magnetized water – saline water – soil properties – plant properties.