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