الفهرس 
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Abstract
To achieve the goal of this study, experimental investigation has been conducted in the sirt region , Libya, that located 450 kilometers from East of Libyan capital Tripoli and it is located between these coordinates 16°35´ E and 31°12´ N to study the potassium status in some soils of Libya.It can be concluded that most of the studied soils are considered poor in their potassium content .thus; Attention should be given to those crops which need high potassium requirements and potassium fertilization in order to have the optimum yield in Libya soils. Also, the irrigation should be by modern irrigation methods (fertigation and spry method) to the potassium become available for plants. The soil in the studied area is non saline with pH higher than 7 and reach to 8.5.Also the soil is highly calcareous having high CaCO3 content.