الفهرس 
Subsurface drip irrigation systems behiviorOnly 14 pages are availabe for public view
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Abstract
Bean requires the soil moisture and air at a high rate, beans is an aerobic plant, bean is one of the least efficient celeries in coping with the root knots bacteria that fixes and azote of the atmosphere, the efficiency of root knots formation increases with the increase of the oxygen level in the plant environment, The azotizing process was done under the aeration effect. Since the azotizing bacteria (Nitrozomanoth and nitrobacter) is an aerobic bacteria, the soil shall be penetrated by air. Consequently, plowing is a main factor in providing the soil air and helps to maintain moisture.