Abstract: Two potash fertilizers viz. Potassium Sulphate (K2SO4) and Potassium Chloride (KCI) at the rate of 100, 150 and 200 kg ha–1 each were applied to Cardinal potato to study their influence on the potato productivity. The application of K2SO4 at the rate of 200 kg ha–1 produced 7.59 tones of small (189.67 thousand) tubers ha–1, while at the same doze KCI produced 1 4.84 tones of large (243.33 thousand table size) tubers ha–1. The total average 21.52 tones tubers ha–1 were obtained with application of KCI at the rate of 200 kg ha–1, followed by 21.2 tones tuber ha–1 with the application of K2 SO4 at the rate of 200 kg ha–1. The poor yield 18.25 tones ha–1 was gained in control.