Dr. L. T. Alexander, Chisf of the Depsrtment of Agriculture Soil Survey Laboratory, Leltsville, Maryland, has suzecsted that the low results for alfal- fas grown on the two Plainfield sand soils (farms #11 and 7/12) may be due to ereater root depth which would result in their cetting most of tnoir calcium well below the surface and h2nes out of reach of the majority of the strontium-\. activity. Table 5 Comparison of Sr99 Tevel in Related Alfalfa and Soil Samnles Avail, Ca Q-2" depth Sr90 Soil level, Sr? Plant level, 31,2 (9-21), 9,5 + Ob 30.5 + 1.7 3.1 (9-8"), 6.83 + 0,08 13,6 + 0.6 (~0.8) 15.0 (O-2"), 26.7 + 1.0 19.2 + 1.0 0.72 Yurveski (ic7)# NeHenry Co., Ill. ~9eh (0-5.5"), 12.3 + Oo 7.05 + 0.33 (~0.2) Premo (6) Columbia Co., ‘Wis. ~8,2 (0-6"), 15,0 + 0.5 25.5 + 1.3 (0.7) Hekee (49) ticHenry Co., Ill. Suarson (13)% “Vinnebago Cos, Ill, Holcomb (4):) Rock Co es ‘in S.U. (e/ft2) Farm ~2007 in S.U. | Patiow Wis e sustin (#2) 6.92 (0-2"), 49.9 + 1.5 38,0 + 2,0 0.76 Van Winkle (#11) “11 Co., Ill. heb (O-2"), 65,1 + 2.6 he? + 0.21 0.073 3.7 (0-2"), 64.5 + 1.3 2.73 + 0.18 0.0h2 UcHenry Co., Ill. Lh Carver (41 Will Co., Ill. * Field recently rloved. w% Ratio = S.U. Plant/S.U. Soil over 0-2! denth, NYOO (For the three unploved soils, the 0-2" denth concentration of Sr? is arbitrarily taken as 2.5 times that deternined for the gsreater depth, 53