In the years 2017–2019, field experiment was carried out on light soil to determine the effect of foliar fertilization of potato plants with a silicon fertilizer (Krzemian) on the yield and selected quality characteristics of potato tubers. The fertilizer used for the experiments contained: Si(OH)4 – 2.5%; Cu – 1.0%; Zn – 0.6%; B – 0.3%; Mo – 0.2%. Each year, from one to three foliar fertilization treatments were performed in the development stages of potato plants BBCH 19, 39, 70. The control was the object without foliar fertilization. Mineral fertilization was applied in the following doses: 100 kg N ha–1, 26.2 kg P ha–1 and 99.6 kg K ha–1. Under the influence of the applied fertilizer, a significant increase in tuber yield was obtained, mean by 12.9% compared to the control object. The weather pattern in the years and the number of treatments performed with the fertilizer significantly differentiated the increase in tuber yield. The highest increase in tuber yield was achieved in dry year with the highest mean air temperature, applying of fertilizer twice during the growing season. There was a general tendency of an increase in the yield structure of the share of tubers with a diameter of above 60 mm and a decreasing tendency of deformed tubers after application of the Krzemian fertilizer compared to the control object. A beneficial effect of the Krzemian fertilizer on the content of starch and vitamin C in tubers was demonstrated.
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