Two field experiments were conducted at Ali Moubarak Experimental Farm of the South Tahrir Research Station, Egypt, during summer seasons of 2013 and 2014. The aim of this study is to compare the effect of potassium sources, i.e. potassium sulphate (sulphate of potash SOP) and potassium chloride (muriate of potash MOP) both at the rate of 0, 60 and 120 kg K ha^-1 on growth, yield and quality of peanut under sprinkler irrigation system, as well as soil contents of available-K, soluble chloride and EC after harvesting. The results showed that there were no significant differences between SOP and MOP for plant height, No. of branches plant^-1, No. of pods plant^-1, pod and seed yield plant^-1, 100-pod weight, 100-seed weight, pod, seed and straw yields, shelling percentage as well as oil and protein yield and N, P & K uptake in seeds. Also, potassium sources had no significant effect on soil contents of available K, Cl and EC after harvest. However data note that, applying potassium at the level of 120 kg K ha^-1 brought about significant increases in the above mentioned parameters except shelling percentage which was not significantly affected by potassium levels. Also soil contents of available-K and soluble chloride were significantly increased by increasing K fertilizer levels, however there was no salinity build up due to potassium fertilization in sandy soils. Most of the studied traits were significantly affected by the interaction between K-sources and K-levels. The interaction treatment of 120 kg K ha^-1 as (SOP) was found to be the most effective one, and recorded the highest values of seed yield plant^-1,100-seed weight, pod, seed and straw yields.