In the years 2014-2015 at the Institute of Plant Breeding and Acclimatization, Branch Jadwisin the investigation concerned the influence of irrigation of organic potato plantation on tuber yield and tuber size distribution was carried out. Eight potato cultivars of different maturity class were assessed. It was stated that irrigation significantly influenced both the total tuber yield and the share of different-size tubers (excluding medium size). Under irrigation the increase in total yield was observed but it was not equal for all cultivars. The increase for cultivar Cyprian was 3 times bigger than for cultivar Ignacy. The highest changes due to irrigation concerned the share of big tubers (>60 mm). Seven among all cultivars reacted by a very high increase in this size tubers (to 80%), but one of them reacted by decrease in this tuber fraction.
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