الفهرس 
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Abstract
As the human population of the world increases and utilizes more land area for housing and industrial activities, agriculture is being forced into marginally productive areas. Drought, nutrient deficiencies and toxicities, salinity, temperature extremes, air pollution, and chemical interferences are stresses often encountered. Alteration of environment and climate may also result from human activities that increase the stressful conditions under which plants must grow and survive.