الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
In Minia , there is a difference between soil temperature in winter and summer ; soil temperature reaches in winter 14 ◦C , whereas in summer temperature rises up to 59◦C . For this fluctuation in temperature , the study of seasonal variation and its effect on soil microflora , organic matter , nitrogen content as well as enzymes activities is of great agricultural importance .
A field experiment was carried out using four treatments of soil namely : soil cultivated with either cotton or sugar –cane , fallow soil and sharaqi soil . The fallow soil received the left untreated