Table 1. Concentration of 24lam in Barley Grown in Yolo Loam Soil With Different Concentrations of 24*1Am Blended With Soil Concentration of 241am in Barley, dpm/g Dry Weight 241 am Activity Level in Soil Harvest 1 Harvest 2 dpm/g 4,000 10,000 20,000 40,000 LSD 0.05 Harvest 3 Harvest 4 Without DTPA 104 184 175 280 103 24 48 65 100 28 24 36 52 64 NS 12 26 38 64 39 1,370 2,430 4,770 10,860 698 330 764 1,310 3,194 838 With DTPA 4,000 10,000 20,000 40,000 LSD 0.05 638 1,724 3,043 9,700 2,008 1,483 3,654 8,600 18,840 2,159 With DTPA/Without DTPA (ratio) 4,000 10,000 20,000 40,000 6.1 9.4 17.4 34.6 61.8 76.1 132.3 188.4 631 57.1 67.5 91.7 169.7 27.5 29.4 34.5 49.9