Two field experiments were carried out at the Experimental Farm of El- Nubaria  Agriculture Research station, Alexandria, Egypt, at the Kilometer 71 North west to study the effect of potassium fertilizers and organic manure (Farmyard manure) on yield and quality of sugar beet (var. Kumara) during the winter seasons of 2014/2015 and 2015/2016. The experimental design was split plot design with three replicates.The main results could be summarized as followers: (1) All characters for yield and quality was significantly affected by potassium fertilization. Application of 60 kg K₂O/fed, gave the greatest values of root length, top yield/fed, root yield/fed biological yield/fed and sugar yield/fed as well as sucrose% and TSS% in the both seasons except purity% in the two seasons. (2) All characters increased by increasing rate of organic manure up to 10 m³/fed, except purity% in the two seasons. (3) The interaction indicated that the highest all yield sucrose% and TSS% was obtained by application 60 kg K₂O/fed, with rate of 10 m³/fed farmyard manure in both seasons. The farmyard manure plays a major role in crop production in deserts soils sence it inirriazant the use of chemical fertilizer and decreases environmental pollution.