USE OF ORGANIC MATTER AND SAND IN IMPROVING PROPERTIES OF SOME SOILS OF HOLY KARBALA GOVERNORATE AFFECTED BY PHENOMENON OF CRACKING

This study was conducted to show the effect of cows' manure, date palm residues, sand fraction and interactions between them in treating common cracking phenomenon some soils holy karbala governorate, their role improving physical characteristics those soils, represented soil aggregates stability, modules rupture, linear expansion coefficient.Two agricultural sites were selected whose are characterized by heavy clay textures widespread within Karbala first Al-Kamaliya area second Al-Khairat area. The results, showed a decrease number cracked masses, sizes both studied soils. with an increase levels addition animal plant residues sand,and reached lowest treatments which cracks disappeared while highest values ​​of mean weight diameter for two sites. Results that decreased rupture coefficient increasing rates reaching ​​in compared reference treatment.