الفهرس 
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Abstract
Soybean (Glycine max L.) is one of the most important legume crops in Egypt and many other countries in the world Fusarium oxysporum and Rhizoctonia solani attack soybean at ferst stage of growth affecting root rpt and damping-off diseases. Objectives: 1-Survey of soybean root rot disease in Kafr El-Sheikh, Gharbia and Behera governorates. 2-Preparation of inocula (Rhizoctonia solani and Fusarium oxysporum) and preparation of pathogenicity test and soil infestation. 3-Reducing of damping-off and root rot diseases of soybean Using of compost powder and compost tea as soil treatment and using different levels of potassium sulphate and potassium chloride in combination nitrogen and phosphorus fertilizers 4-The effect of using the aforementioned treatments on the activity of certain enzymes i.e. peroxidase and polyphenol oxidase in soybean plants and effect of the one soybean seed contents(oil and grude protein precentag). Methods & results: The present work was carried out in the Experimental Farm, greenhouse and Plant Disease Research Laboratory of Sakha Agricultural Research Station, during the period of 2010-2014. The obtained results from this study indicated the following: The isolation results showed that, the fungal species, Rhizoctonia solani and Fusarium oxysporum were the most prevalent fungal species which isolated from different cultivars roots of soybean at different locations in Kafr El-Sheikh, Gharbia and El-Behera governorates. The highest mean of fungi frequency were recorded in Kafr El-Sheikh governorate the soybean cultivars Crawford, Clark and H30 had the highest damping off percentage as well as the lowest germination percentage, highest disease severity, lowest fresh and dry weight of shoot and root, and lowest plant length.The revers was true in case H11l145,H32and Holladay the lowest fresh and dry weight of R. solani and F. oxysporum mycelial growth were obtained by treatment of media by Rizolex-T50 fungicide at recommended dose followed by using of compost tea extract at level of 15 ml/100 ml media comparing with control treatment under field and greenhouse condition, using of compost powder at hight level (10g/plot and 12ton/fedan,respectively)using of compost powder under greenhouse and fielr condition at hight level(10g/pot and 12t0n/fedan,respectively),were the most effective on decreasing damping off as well as increasing germination %, increasing of fresh and dry weight of shoot and root, increasing of plant length (cm) and increasing of polyphenloxidase and peroxidase activity under greenhouse condition (artificial inoculation), the potassium chloride (KCl) in combination with phosphorus fertilizer (at the recommended dose) and high and low tested level of nitrogen fertilizers were significantly affect decreasing of pre and post emergence damping off as well as increasing germination percentage, decreasing of disease severity, increasing of fresh and dry weight of shoot and root, increasing of plant length (cm) and increasing of polyphenoloxidase and peroxidase activity, comparing with control treatment. On the other hand, under field conditions, the obtained results indicated that, using of potassium chloride fertilizer in combination with phosphorus fertilizer (at recommended dose) and with either two tested levels of nitrogen fertilizer, led to the highest effect on decreasing of damping off and disease severity, and had the highest effect on increasing of yield per plot (kg), increasing of weight of 100 seeds (g) and increasing of polyphenoloxidase and peroxidase activity comparing with control treatment Conclusion: Generaly, from our results of this study we can concolouded that: When compost powder was added to the soil by 10 ton-feddan, disease assesments were significantly reduced . At the som time the vegetative and yield characterestics were positively increased. These positive results costat about 450 pound –years / feddan /year,thise treatment wewe effective during 4years in the soil ,the using of compost powder was not expensive. On the other hand, the compost tea was also in the same cost.