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Preventive measures need to be undertaken in the land-use systems and watersheds of the Siahroud River to reduce the pollution levels of Pb, Cd, Mn and Fe.Cd, Mn and Fe.

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Ap-0 to 13 cm; very dark grayish brown (lOYR 3/2) loam; moderate medium granular structure parting to moderate medium subangular blocky; friable; medium acid, A-13 to 25 cm; very dark gray (lOYR 3/1) loam; moderate medium granular structure parting to moderate medium subangular blocky structure; friable; medium acid. AB-25 to 33 cm; very dark grayish brown to dark brown (lOYR 3/2 to 4/3) clay loam; moderate medium subangular blocky structure; friable; medium acid.Bwl-33 to 6A cm; yellowish brown (lOYR 5/4) clay loam; strong medium subangular blocky structure; friable; neutral.Bw2-64 to 89 cm; yellowish brown (lOYR 5/4) clay loam to loam; few medium faint yellowish brown (lOYR 5/4) mottling; moderate medium subangular blocky structure; friable; neutral.Bw3-89 to 114 cm; light olive brown (2.5Y 5/4) loam; common medium distinct yellowish brown (lOYR 5/4) mottling; moderate medium subangular blocky structure; friable; neutral. BC-114 to 1A2 cm; light olive brown (2,5YR 5/4) loam; common medium yellowish red (5Y 5/6) mottling; weak medium subangular blocky structure; friable; mildly alkaline. C-142 to 218 cm; yellowish brown to pale red (lOYR 5/6 to 2.5YR 6/2) loam; mottled; weak medium subangular blocky structure; friable; mildly alkaline.Cgl-218 to 295 cm; light brownish gray (lOYR 6/2) loam; many medium dark reddish gray to yellowish red (5YR 4/2 to 4/8) mottling; moderately alkaline; violently effervescence; gradual boundary.Cg2-295 to 310 cm; light brownish gray (lOYR 6/2) loam; common coarse dark brown (7.5YR 6/2); moderately alkaline violently effervescent; gradual boundary.