Table 2. Concentration Ratio (C.R.) of **!Am in Barley Grown in Yolo Loam Soil With Different Concentrations of 241!Am Blended With Soil 24 lan Activity Level in Soil Harvest 1 Harvest 2 dpm/g Harvest 3 Harvest 4 Without DTPA 4,000 10,000 20,000 40,000 0.023 0.018 0.009 0.007 0.006 0.005 0.003 0.003 0.006 0.004 0.003 0.902 0.0030 0.0026 0.0019 0.0016 LSD 0.05 0.007 0.002 0.002 .0012 0.347 0.243 0.239 0.272 0.083 0.076 0.065 0.080 With DTPA 4,000 10,000 20,000 40,000 LSD 0.05 0.160 0.171 0.152 0.242 NS 0.371 0.366 0.430 0.471 NS 0.048 633 NS