Resistance to oxalic acid (OA) of 37 lucerne and 3 red clover accessions was evaluated. The seeds of test entries were germinated in Petri dishes on filter paper moistened with 7 OA water solution concentrations: 0, 5, 7.5, 10, 15, 20, 30 mM. The test lucerne accessions did not differ by resistance to OA in regard to the origin of accessions or their development status. Accessions considerably differed by resistance at a concentration of 10mM of OA solution. More than a third (42%) of lucerne accessions were totally susceptible to OA at conc. 30 mM. However, 0.0–23.8% of resistant seedlings of these accessions were found at OA conc. 20 mM. Lucerne accessions showing resistance (0.7–3.8%) at OA conc. 30 mM expressed a similar resistance level (3.1–26.7%) to OA conc. 20 mM as well as accessions totally susceptible to OA conc. 30 mM. The OA conc. 20 mM was adequate for selection of resistant seedlings in breeding material with a lower resistance, and conc. 30 mM was suit-able for screening more resistant accessions. This method showed an efficient possibility to select seedlings resistant to OA and in turn to