الفهرس 
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Abstract
The Enzymatic Pyrophosphate Hydrolysis in some Egyption Soils Was Studid. Twenty Two SurfacesOIL samples (0-20 cm) Were Colicted from Different Locations To Represent, As Much As Possible, The Varios Soil Textural Classes. The Factors Affecting Soil Pyrophosphatase Behavior Were Studied To Get Quantitative Information about Soil Pyrophosphatase activity.