This paper describes the results of the simulation experiment with use of Daisy model (‘Potato Triada’ calibration) which covered potato cultivation over 2000-2006 and three potato cultivation systems: conventional, pro-ecological and integrated. The results show that manure with proper irrigation ensured the highest potato tuber yields (about 55 t∙ha^-1 of fresh weight) in all the systems tested. The irrigation methods used (simple ba-lance and decision support system: DSS) eliminated water stress during the potato vegetation period with the application of the total irrigated water rate of about 110 mm. Irrigation increased evapotranspiration and the number of N stress days regardless of potato cultivation system. The lowest values of nitrogen balance were 49 and 58 kg N∙ha^-1 in integrated (dynamic and static options) systems of cultivation. The highest content of N in soil (101 kg N∙ha^-1) remained in pro-ecological combination, without irrigation. For the vegetation period the nitrogen leakage from soil assessed by Daisy ranged from 8 to 14 kg N∙ha^-1 for the period of potato vegetation. The Daisy model with the ‘Triada Potato’ calibration facilitated the simulation of potato yields with RRMSE of 15.4%, for the conventional cultivation system of that crop in Plant Breeding and Acclimatization Institute Jadwisin.

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