A potato field experiment was conducted for 2 consecutive years to determine the effects of nitrogen (N) and potassium (K) fertilization rates on the yield and quality of potato cv. Spunta cultivated on soil low in N and K. A 3 × 4 complete factorial experiment was used with three rates of nitrogen (330, 495, and 660 kg N ha -1 ) and four rates of potassium (112, 225, 450, and 675 kg K 2 O ha -1 ). An additional treatment without fertilization was used as the control. On soils low in N and K, potatoes showed low yield response to K fertilizer. The greatest tuber yields for both years were achieved at 495 kg N ha -1 and 112 kg K 2 O ha -1 (29.81 t ha -1 ) and 225 kg ha -1 (27.13 t ha -1 ), respectively. Differences in mean fresh weight due to treatment application were not significant. Application of 495 kg N ha -1 significantly reduced harvest index (the ratio of tuber dry weight to the total dry weight at harvest) compared to 330 kg N ha -1 , but at 660 kg N ha -1 harvest index achieved the greatest significant value. Potassium fertilization had no significant influence on harvest index. Nitrogen rates positively influenced the number of tubers. The addition of 450 kg K 2 O ha -1 significantly enhanced the number of tubers compared to the lower K rates, and the number was significantly decreased by the application of 675 kg K 2 O ha -1 . Tuber dry-matter concentration was significantly promoted by N fertilization in both cultivation years, but it was negatively affected by K fertilization in the first year of cultivation. There was no change in tuber N with N application, but N application strongly increased nitrate (NO 3 ) concentration, which fluctuated between 360 and 1382 mg kg -1 wet mass. Tuber NO 3 was negatively correlated with tuber yield, indicating that high levels of NO 3 in tubers can adversely affect yield. Tuber response to K fertilization was not in accordance with the rate of applied nutrient.
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