Table I. Nutrient levels and soil reaction in the surface A, horizon of the five most extensive soil series Soil Series Per Cent Nitrogen Per Cent Organic Matter *Exchange Capacity *Sodium *Magnesium *Potassium Phosphorus (ppm) PH Al * Rongelap Gravelly Sand Gogan Gravelly Sandy Loam 0.57 16.7 22.2 3.36 4.19 1.95 81.7 8.1 1.71 35.6 37.7 4.01 11.06 1.80 985.2 meg per 100 grams of oven dry soil 7.8 Lomuilal Sand 0.26 6.4 12.6 2.68 3.21 0.79 54.2 8.4 (from Kenady 1962). Beach Ridge Sand 0.09 4.5 3.7 1.16 2.55 0.37 32.8 8.6 Kabelle Sand 0.14 7.7 5.7 1.52 1.92 0.46 32.1 8.6