[en] The results are reported of a study of plutonium contamination of grain samples of wheat, rye, barley and oats collected in 1963 and 1965 from eleven Danish State Farms distributed over the country. Plutonium was analyzed on 1-5 g grain ash by the classical anion-exchange method and α-counted for 3 days on a Si-detector. The results showed a highly significant variation (P > 99.9%) between years and among species. The variation among locations was not significant (P approximately 85%), but showed the same pattern as observed for other radionuclides found in Danish grain, i.e. the western, high-precipitation locations (760 mm yr^-1) showed higher levels than the eastern, low-precipitation stations (620 mm yr^-1). It is concluded that, although Danish cereal products contained relatively higher plutonium concentrations, their contribution to the wholebody content of the Danish population is not very significant. (author)