The experiment was conducted on Sultani fig trees located on the farm of Shandawil Island Research Station, Sohag, Egypt, throughout the course of two subsequent growth seasons in 2020 and 2021. The goal of the study was to determine the applying various potassium sources to Sultani Fig trees' vegetative growth, yield components, and fruit quality. Data showed that when compared to untreated ones, the application of various potassium fertilization sources considerably enhanced leaf area, shoot length, and shoot thickness. Additionally, yield, ripeness, and fruit quality were all improved by all investigated potassium fertilization sources. The usage of potassium thiosulfate led to the maximum values of fruit weight, length, and diameter being noted. Between all examined treatments, there were no appreciable variations in fruit length or fruit diameter. The highest TSS and reducing sugar values, as well as the lowest titratable acidity values, were produced by vinasse and potassien. Additionally, no appreciable variations were discovered between them. One may deduce that in order to improve some vegetative development, high yield, and good fruit quality, different potassium fertilization sources were required twice a year. Therefore, from an economic perspective, vinasse and potassien are preferred. Due to reduced pollution and a lower overall cost of production.