Cereal, forage and vegetable crops grown in a loam soil in a greenhouse experiment varied in the relative concentration and uptake of Cs-137 but took up only a small percentage of the Cs-137 dose applied. The proportion of added dose taken up by sugar beet tops, the highest of any crop investigated, was only 0.13%.The Cs-137 concentrations found in vegetable crops were generally higher than those of forage crops, which in turn were generally higher than those found for cereals. On the other hand, the edible portion of most crops grown had lower Cs-137 concentrations than did the nonedible portion. The Cs-137/K ratios were not constant, and only in cereal crops was there a significant correlation between Cs-137 and K concentrations. Thus, the relation between Cs-137 and K was not as close as that usually found between Sr-90 and Ca.