410379 : 7? RADIOCZSIUM IN PLANTS GROVN ON RONGELAP ATOLL 30I4L35~ R. 3B. Walker, E. E. Held, and 3. P. Gessel* AB3TRACT Tomato and squash plants were grown in greenhouse pot cultures using soil from Rongelap Atoll, which received fallout contamination in 1954. ous combinations of N, FP, The treatments involved vari- and K. All fertilizer treatments marsxedly reduced the content of Cs-137 whe tissue. Also t 3 Oo rw (asd a wy rr aal GQ cf a fielc experiment on Rongelap Gs oO bt ti reduced the conten °o fart ct Island in which po hw. tTeported are the results an with KCl ac least in a native grass. temporarily Potassium and Cs-137 contentsof foliar samples of several woody species collectec on Rongelap Island are also included. In the most common pattern,X and Cs~137 contents of the upper foliage were higher than those of the lower leaves, but one species con- sistently showed higher K but lower Cs-137 in the upper foliage. Low K status of the soil and differences in mobility within the plant may explain these patterns. BEST COPYAVAI LABLE leontribution from the University of Washington under Contract No. AT(45-1)54D, with the United States Atomic Energy Commission. 2Department of Botany, men, Pe 1 8 ne elem kK Laboratory of Radiation Biology, Ba a a ee em me we pane tiaeaemitece