الفهرس 
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Abstract
SUIIIIARY This research is an attempt to optimize their productivity of problem soils through the use of field crop varieties that can grow and give profitable yields under the prevailing adverse conditions. Problem soils existing in Egypt include those suffering from stresses due to salinity, water shortage or nutrient deficincies.
The Virst part of research aimed at introducing certain varieties of some of the important field crops namely, wheat, barley and sorghum that can sustain the unfarorable conditions of salt—affected soils. After selection of the experimental sites and crop varieties, four fe1d experiments were conducted on these saline soils using different rates of. fertilization. All experimental sites are normally irrigated by underground water of variable salinity levels. Soils were characterized for their physical and chemical characteristics and the salinity level was followed up in the soil as well as irrigation waters throughout the growth season. Plants were sampled twice during the season to determine the fresh and dry weights. At maturity, plants were harvested and the yields of both grains and straw
were estjysted for each plot- Resu2?s of Ibis par! can
ra] Zr bt’ oat) jrtd as follows;