Ap
Bt1
Bt2
Bt3
BC
C
0
18
30
53
86
119
183
—
University or KSSL Laboratory
7.2
7
6.5
5.5
5.8
MEDIC
Medicago
alfalfa
ochric epipedon
argillic horizon
redox concentrations
—-
4
311
90
899
155
8.2
21
-5.9
IL8293
Stockton 1 N