الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Watermelon is one of the important plants of the cucurbitaceae family and it contains a high amount of water, large amounts of sugar and vitamins A, B and C. Watermelon production in Egypt is mainly conducted during the summer season in the open field, but about 20% of its cultivated area is grown under low tunnel conditions during winter. The newly reclaimed lands occupy the vast majority of the area planted with watermelon and represent about 50-53% of the total area in which the drip irrigation system is used and these lands are poor in their content of nutrients necessary for the intentions and also these lands lack in their content of organic matter that leads to increased water consumption, especially at the present time, which the country from the limited water resources. In the recent years, the prices of mineral fertilizers have increased in Egypt, despite this, many watermelon growers in Egypt resort to use them, which in turn leads to an increase in production costs for farmers. The excessive use of these fertilizers also leads to negative effects on the soil and groundwater and increases the pollution of the environment. Organic fertilizer has a direct role in plant growth, as it is a source of all macro and micro elements, as well as containing microorganisms, which improve the natural and chemical properties of the soil and increase its content of humic materials that help in increasing the soil’s retention of water in light of the scarcity of water resources in the country. Also, the use of bio-fertilizers can reduce the use of chemical fertilizers, which is economically useful and effective in reducing soil pollution and producing a clean product of watermelon under Egyptian conditions.