This study have been conducted to know the effects of rainfall intensity, land slope and Bitumen & wheat straw addition on the changeability of soil bulk density and modulus of some soils at western Iraqi soils under simulated rainfall. Soil samples have been taken from (0-30cm) depth for four regions which are: Zangora, Mhammadi, Madheek and Heet whose erodibility classes are; high, moderate-high, moderate and low respectively. The samples air dried and sieved through 4 mm diameter sieve then situated in experimental flumes.
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Two types of conditioners Bitumen and wheat straw were mixed with 5cm depth of soil at 1% concentration and 6 M gm. ha-1 levels respectively. Containers fixed in four slopes 0, 3, 5 and 7%. All treatments have been distributed randomly in three replicates for each one, according to CRD design with factorial experimental. All the experimental units were exposed to simulated rainfall at two intensities 30 and 53 mm. h-1 for 30 minutes. Soil bulk density and modulus of rupture .
The interaction between soil erodibility and rainfall intensity also showed high significant effect on the two traits. Two conditioners had high significant effect in decreasing the two studied soil physical properties but wheat straw showed prevailed in its effect than Bitumen.