[en] Full text: For many years the work on mutagenesis focussed on using ionizing radiation or chemical compounds. The treatments and doses inducing optimal effect were studied extensively. Many studies concerned mutation spectra observed after the action of different mutagens. Here we describe a new method for obtaining mutants and the first experiences of its application. The new method consists of exposing plants (germinated seeds) to the action of electromagnetic field, which is formed between the anode and cathode of direct current with a voltage of 12 and 24 V. The cathode is a graphite electrode permanently immersed in distilled water. The other electrode (made from silver) is inserted between the germinating seeds. The seeds are in contact with water, though they are not immersed. Therefore, the current flows between the electrodes through the seedlings. In order not to destroy the meristems of young roots the roots were placed above the water. The distance between the electrodes did not exceed 15 cm. After placing the electrodes and seeds the current is switched on. The current did not exceed several Amperes in all the variants of the experiment. The exposure was 2, 5 and 10 minutes. During the exposition the current decreased; differences were distinct - from some tenths to some Amperes. Germinating seeds of maize (pure lines from Exp. Station Smolice), barley, wheat and soybean were exposed in this way to the action of an electromagnetic field. A comparatively low voltage and current caused necrosis of most plants. Few plants produced seeds. In the M₂ generation they were singly sown in pots. Distinct mutants were detected in the M₃ though the scale of their variation was not large. Barley and wheat had a different response than soybean. Certain sectors of spikes were sterile. Plants grown out of these sectors developed seeds again showing sterile sectors. In soybean morphological and physiological differences observed exceeded the variation encountered in hybrid populations and in populations of plants obtained under the effect of other mutagens. A final description will be made on M₄ lines. Continuation of the studies is necessary. Results will be published in ''Genetica Polonica''. (author)