وراثة و تطور الأفق أرجلك لبعض ترب شمالي العراق

Abstract EN

Seven pedons were selected within three zones northern Iraq, represent a high mean annual rainfall (semi humed regions).

The zone are Penjween in Al-Sulaimania Governorate, Mergasure in Arbil Governorate and Sarsank in Duhok Governorate, to study genesis and development of argillic horizons.

The results revealed increase of total clay content in subsurface horizons to the level which perform argillic horizons formation conditions.

Total clay content increase in illuvial horizons as compard with eluvial horizons and fine clay content comes agree with total clay distribution in these horizons and Also the ratio of fine clay/ total clay.

The micromorphological results indicated the movement of clay from the surface horizon to subsurface horizon which include argillans and ferri-argillans and orgargillans as well calcians as a result of pedogenic activity, indicated that clay skins are not clear in some cases as a result of their breakdown by swelling and expansion of clay minerals, to the additions of some materials including carbonates in illuvial horizons.