Studying of potassium forms status in forest and grass soils in mateen mountain, duhok governorate

الملخص EN

Eighteen (18) surface soil samples were collected from six sites in Mateen mountain, from three different locations (ARIZ, BAMARNI, BIBADI) in Duhok governorate, North of Iraq.

the research aimed to study the potassium form status and its relationship with the soil's physico chemical properties.

the result indicated that the soils were alkaline, and electrical conductivity ranged between (0.4-0.6) ds.m¹ is a normal range.

moreover, the highest value of organic matter and cation exchange capacity CEC was found in forest soil (4.68%,32.66 cmolt.kg), respectively, than in grassland (1.92%, 19.38 cmol.kg).

most soils ranged between clay to clay loam in soil texture; according to land use, there is a highly significant difference between all forms of potassium K (soluble K, available K, exchangeable K, total K) in forest soil than in grassland except non-exchangeable K form.

while the distribution of potassium forms depending on location, the water-soluble K was higher in bibadi and bamarni (0.108 and 0.085) cmol .kg respectively as compared to arize.

however, there was no significant difference between available K and exchangeable K, non-exchangeable potassium in forest soil more than in grassland, and total potassium was higher in ariza and bibadi locations compared to the bamarni area.

the predictability of potassium forms depended on soil properties; organic matter, cation.

exchange capacity CEC, and clay content.