ne response in yield to poiassiwn additions, and che tissue from tha NoPgK2 treatment contained Cs-137. In ali cases the fertilizer amendments caused a sharp reduction in the Cs-137 content expressec on a d/m/gm dry basis, although this effect could not be associated with a particular fertilizer element. Yhe depressive effact of fertilization on cesium uptake is also evident when the total Cs-137 in the shoot is calculated, indicating that dilution by a greater amount of dry yield can not explain the reduced cesium content. In the different. por- ‘jons of the squash shoots. Cs-137 was in all treatments highes. in the upper leaves, iniecemediate in the stem. lowes: in the lower laaves,. Squash and plants grown on the 3ame nenach at the same time but in a gceanhouse loam sO41 contained no Cs~-i37. Results of analyses foc Ca, Mg, Na, and Po, in the issue do nor offer any obvious explanation for the differences in cesium uptake, although it should be noted that calciun levels were very high. especially in the lower leaves, in which . Ca ranged from 690 to 930 meq per 100 gm of dry tissue. Analyses of Leaf Tissue Collected on Rongelap Atol} Foliage sampies have been collected in the field, prima~ cily from woody plants, which dominate the atoll environment. In most cases 3eparate samples were taken of the upper and the