A study was conducted at eastern zone of Tigray, Ethiopia during 2012 rainy season to evaluate the effect of phosphorous and potassium fertilizer rates on the yield and yield components of potato (Solanum tuberosum L.). In this experiment a combination of four levels of phosphorous and four levels of potassium were used. The design used was a factorial experiment arranged in Randomized Complete Block with three replications in two locations. The recommended N 110 Kg/ha rate for potato was applied as urea to all treatments equally. The study revealed that effect of location and PK fertilizer...