In the years 2005-2013 experiments concerning yielding of potato under organic system in two places of different soil-climatic
conditions were conducted. During 9 years in 3-year cycles, 22 cultivars from different group of maturity were tested.
It was stated that the yield depended mostly on climatic conditions in years of investigation and cultivars. The place of
growing had no statistical influence. An average yield on heavier soil was 211 but on lighter one- 221dt·ha-1 Most of tested
cultivars yielded in range 200-300 dt·ha-1 On heavier soil the stability of yielding was grater. It was stated the different reaction
of cultivars from different maturity groups. Early and mid-early cultivars achieved higher yields on lighter soil, but
late cultivars - on heavier one.
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