abstract: The purpose of the work was determination of changes in the value of puncture force of the skin of potato tubers exposed to microwave radiation dependent to their maturity. The experiment was conducted in the years 2005-2007 under cover of foil tunnel. In experimental material used were three very early potato varieties: Felka Bona, Velox and Rosara. Tubers were exposed to microwaves of 2.45 GHz for 10 and 15 sec. of exposure. The author observed a positive influence of microwave irradiation of tubers that were taken for the experiment at the stage of incomplete maturity on potato tuber skin puncture force corresponding to its biological strength limit.