NEW POTATO CULTIVARS UNDER ORGANIC SYSTEM – EVALUATION OF SUITABILITY Summary

The study was conducted in 2011-2013 in two places, with different climate and soil conditions. The usefulness of 7 potato cultivars of different groups of earliness for growing under organic farming system was evaluated. It was found that among the analyzed factors affecting the yield of tubers such as cultivar, place of growing and years of research, significant differ-ences concerned only climatic conditions during tested years. The highest yields were obtained in both places in the pre-ferred 2012, and the lowest in 2013 with a very unfavorable weather conditions. The structure of the yield was significantly affected by all the examined factors. On lighter soil, a significant diminution of yield took place. The quality of the crop de-pended largely on the cultivar and growing location. It was concerned most studied external and internal tuber defects. Taking into account both the yield and the quality of the tested cultivars most useful to organic production were:- on lighte