الفهرس 
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Abstract
A field experiment was conducted at the Experimental Farm, Faculty of Agriculture, Suez Canal University to evaluate the influence of different irrigation systems on the distribution of plant roots and some nutritional elements in faba bean, cowpea, onion and maize which cultivated in Sandy soil foe two seasons. Three irrigation systems (Surface, drip and sprinkler irrigation) were used in this study. The data of the first season showed that the distribution of root length density and specific root length of faba bean and onion roots was spread at the top layer under drip irrigation more than sprinkler and surface irrigation. Soil moisture distribution was more uniformity under drip irrigation than surface and sprinkler irrigation. Ammonium concentration was higher at the surface irrigation than drip and sprinkler irrigation, respectively and most of the available nitrates was found in the top layer of soil under the sprinkler and drip irrigation as compared with surface irrigation. The data showed that phosphorus availability in the soil planted with faba bean under the three methods of irrigation was higher at the surface layer under drip irrigation than the sprinkler and surface irrigation. Available potassium tended to move both horizontally and downward under drip irrigation. The data of the second season showed that vertical distribution of roots, root length density of maize and cowpea decreased with the increase in soil depth. Ammonium concentration under sprinkler irrigation was higher than the concentration of NH4+-N under drip and surface irrigation. Nitrate was leached from the surface irrigation more than the drip and surface irrigation. Also the data showed that available phosphorus concentrated in the surface layer from 0-15cm at the three irrigation systems. The data showed that potassium availability increased horizontally and decreased vertically with increasing in soil depth under drip irrigation.
Keywords: Root Distribution- Nutrient Distribution- Irrigations Systems
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