الفهرس 
Review of literature
Spanich yieldOnly 14 pages are availabe for public view
 |  | from | 149 |  |  |
| | | from | 149 | | |
Abstract
Based on the results of our experiment, we can conclude that the quality of the River Nile water was the highest, and it could be used for irrigating most field crops under different soil conditions without any limitations. The quality of the studied secondary water resources (groundwater and drainage water) is accepted for irrigating spinach and most tolerance field crops for salinity, boron and chloride ions. However sensitive plants should be excluded from irrigation with these resources even it was blended with fresh water. Restricted limitation should be conducted to face the negative effect of these secondary water resources on soil properties, especially heavy clay soils in North Delta which recorded a high significant effect on soil salinity and soluble ions concentration. Spinach fresh weight and its nutrients concentration decreased slightly due irrigation with the secondary water resources as compared with fresh water irrigation. Consequently, it is recommended to extend reusing of these waters in irrigating spinach and most tolerance crops.