minute per gm dry tissue were: unfertilized control, 490; N~P-K, 100; N=P, 190; N-K, 240; PK, undetectable. These results are particularly interesting because all fertilizer additions depressed the uptake of cesium. There was marked response in yield to the nitrogen and the potassium fertilization, but not enough for dilution to account for the dif~ferences in Cs~-137 contents. The absence of radiocesium in the P-K treatment was associated with an unusually high K level in the plant tissue. Following this preliminary expeciment with tomato, a further greenhouse trial was made with aquash, variety Hubbard. Squash was used because it i3 one of the few herbaceous plants successfully cultivaced in the northern Marshall Islands. treatments wero set up in triplicate, The replication was good, anc the plants grew well except for some chlorosis which was not entirely corrected by the application of 1.5 mg Fe per pot as Na¥e2ZDMFe chelated by ethylenediaminetetraacetic acid). The plants were divided into upper leaf, lower leaf, fractions at harvest. and stem 3ince the results were qualitatively the same for the different fractions and space is limited, Table 1 presents the yields and K and Cs analyses on the basis of the entire shoot. The results of this experiment were in general similar to those with the tomato, although there was