الفهرس 
Effect of organic matterOnly 14 pages are availabe for public view
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Abstract
It is acll known that structure is onc of thc most important properties in the soil. The structure is the arrmgcrncnt of structural units- so called aggregates , thcrcforc, it is very important t o study thc s t a b i l i t y of these aggrcgatcs undcr watcr which is thc disperse media in naturc. This study aims t o dctcct thc most important factors affccting the s t a b i l i t y of aggrcgatcs under natural conditiss o f i’?gypt. Thin st~~dalys o, cxtcnd t o find thc rclatioilsliip bctwccn st?> i-lity of aggmgatcs from one side, and aggregation iiiJc~; -,.-I dimc<-l?r of aggrcgates f r om thc otll~’2s ide Undisturbed s o i l scmplcs wcrc collcctcd from different locations in Egypt with diff crcnt lcvcls of salinity. Aggrcgcte fractions wcrc separated according t o its dimcters, in cach aggregate size fraction, thc s t a b i l i t y of aggrcgatcs was dctcrmincd, as wcll 2s materials which scrvc as cementing agcnts such as : solublc calcium, solublc sodium, t o t a l calcium carbonate, organic matter contcnt, moisture contcnt, clay contcnt, frec iron oxidc, free aluminium oxidc md frcc s i l i c a .