Physiological Studies on some field crops in relation to water potential in soil

Soil water plant relationship is the key to modern agriculture, it plays a pronounced role in solving the problems of food and shelter deficiency facing our world today. In Egypt, tho agriculture development or the increase in production is mainly based on water resources and on the efficiency of their use. This can be attained by using the most suitabLe irrigation method for soil and plant, and by making better use of drainage water. The water requirements of plants depend on the balance between the depleted moisture and the irrigation water. Moreover, it is well known that the plant response to total soil moisture stress varies from one stage of growth to another.Although, the response to soil water stress varies with the existing crop and its species, therefore, this work is directed towards understanidng how maize (Zea Mays) and soybean (Glycine max) plants react to face the changes of soil water stress. The objective of this work is to study the infiuence of the water potential in soil - water system on physiological and morphological characteristics of maize( Zea Mays,L.Giza 186) And soybean(gilycine Max,L.,calland) plants.