LIST OF TABLES Number Nutrient levels and soil reaction in the surface Ay horizon of the five most extensive soil series. II. Iii. Iv. sr?° levels in soil samples from two sets of plots. Composition of representative soil types, from Rongelap Atoll (after Kenady 1962). 11 Relative sr?° content of depth increments collected in 1959 from two Rongelap Atoll soil types. 22 sr?° and calcium in the surface 1-1/2 inches of Rongelap soil, Rongelap gravelly sand, collected in September 1959. 24