الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Under Egyptian dense agricultural rotation system , large amounts of various plant residues remain in soil after harvest . Alarge number of plant residues possess antimicrobial properties , a disblacement of the microbial balance can be resumed . Hence , plants crop residues may play a major role in their effect on soil .born human and plant pathogenic microorganisms . The present work is , therefor e , concerned with the detection effect of several plant residues and their extracts belonging to different families on certain microorganisms (E.coli , P.fluorescens , Az. Chroococcum , Azospirillum sp . R. trifolii, Br. Japonicum , R . leguminosarum , Streptomyces Sp., B . cereus , B. megatherium , Sarcina ureae , Staphylococcus aureus , saccharomyces cerevisiae , As . niger , Trichoderma viride , P . italicum and Fusarium solani ) in Vitro . Dry residues of mint plants , fennel plants Anis plants ,Black – cumin (plant and seed ) ,German chamomile flowers , lupin (seed and straw) , onion (Peels and bulb ), garlic (Peels and bulbs ) , chilli (Peels and fruit ) , guava leaves , banana (crude leaves and compost ) , fig leaves , pomegaranat peels , olive leaves , mango leaves , eucalyptus leaves , sugar –cane bagasse (crude , after 45 th day from composting process and compost ) , peanut husks and geranium plant ( crude , after oil extraction and compost ) , were examined for the presence of antimicrobial substances using successive extraction with methanol , cold and hot water respectively for each plant residues .