Two field experiments were carried out during two successive summer seasons of 2016 and 2017 at Gelbana Village east Suez Canal, North Sinai Governorate, Egypt to study the impact of three sources of K-fertilization (K-sulphate, K-humate and K-silicate) at different application rates i.e. 0, 20, 40 and 60 kg K2O/fed. on seed yield, yield components, chemical composition and seeds quality of peanut plants (Arachis hypogae L.) variety (Giza6). Also, effect of K fertilization on salt affected soil pH, EC and content of some available macro- and micro-nutrients were studied. The experiment was carried out in split plot design with three replicates. Increasing rate of added K resulted in a significant increase of seed yield and its components where the highest values were observed with K-humate application and the lowest values were associated with K-sulphate treatments. Similarly, significant increases of seeds content of N, P and K (%), Fe, Mn and Zn (mg/kg), protein and oil contents (%) were found with increasing rate of added K. There were no significant differences in the found values of the studied trails and parameters between the three sources of K fertilization in the two growing seasons. Both soil pH and EC (dSm-1) were decreased with the incremental addition of K, where the obvious diminish occurred in soil fertilized by K-humate followed by those received K-sulphate. In addition, soil contents (mg/kg) of available N, P, K Fe, Mn and Zn were augmented with raising the rate of K fertilization, where the highest contents of these nutrients were found in the soil fertilized by K-silicate followed by those observed with soils fertilized by K-humate. Results obtained from this research indicate the necessity of K fertilization in salt affected soils to improve its properties, increase soil content of available essential nutrients and their agronomic efficiency.