Online Resource 1. Summary of published studies including site elevation (Elev), latitude north (Lat), longitude west (Long), climatic indicators: mean annual precipitation
(MAP), mean annual temperature (MAT), study duration (DUR), crop or crops grown during the study, number of crops in rotation (ROT), soil baseline bulk density (BD), pH,
sand and clay content, initial soil organic carbon concentration (SOCi), sample and tillage depth, and reported or estimated slope and minimum annual residue (MAR) needed to
maintain SOCi.
Pub
#a
State
Elev
m
19
3
3
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
2
5
7
1
1
1
9
10
18
CA
CO
CO
IA
IA
IA
IA
IA
IA
IA
IA
IA
IA
IA
IA
IA
IA
IA
IA
KS
MI
MN
MN
MN
MN
MN
MN
20
1384
1384
350
350
370
370
340
340
402
402
390
390
340
340
340
340
340
300
1095
260
290
290
290
350
350
408
Lat
oN
38
41
41
43
43
43
43
43
43
43
43
42
42
42
42
42
42
42
41
38
42
45
45
45
44
45
44
Long
-o W
122
104
104
94
94
96
96
93
93
95
95
95
95
94
94
94
94
94
95
101
85
93
93
93
95
95
95
MAP
cm
46.2
40
40
100
100
77
77
133
133
143
143
77
77
92
92
92
92
92
93.4
44
78
82
82
82
63
61
63.2
MAT
oC
15.5
10
10
7.7
7.7
7.8
7.8
7.4
7.4
10.7
10.7
9
9
10
10
10
10
10
10.4
10.7
8.6
7.2
7.2
7.2
6.2
5.7
6.2
DUR
Cropb
ROT
pH
Sand
g cm-
Yr
10
7
7
7
7
7
7
7
7
7
7
7
7
3
3
3
3
3
11
10
19
13
13
13
10
29
10
BD
g
3
CTWL
CR
CR
CS
CS
CS
CS
CS
CS
CS
CS
CS
CS
CS
CS
CS
CS
CS
C
CR
C
C
C
C
C
C
C
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
1
2
1
1
1
1
1
1
1
1.3
1.5
1.5
1.22
1.22
1.21
1.21
1.31
1.31
1.11
1.11
1.18
1.18
1.42
1.42
1.42
1.42
1.42
1.3
1.4
1.7
1.3
1.3
1.3
1.3
1.2
1.27
Clay
7.2
7.0
7.0
6.2
6.2
6.5
6.5
5.7
5.7
6
6
6.3
6.3
7
7
7
7
7
6.5
7.1
6.5
6.4
6.4
6.4
7
7.5
150
250
250
217
217
26
26
342
342
18
18
15
15
100
100
100
100
100
80
190
850
200
200
200
322
370
175
SOCi
Sample
depth
kg-1
300
420
420
453
453
348
348
243
243
291
291
347
347
300
300
300
300
300
360
256
65
150
150
150
331
250
350
Tillage
depth
cm
9.9
8
8
36
36
30
30
29
29
27
27
33
33
31
31
31
31
31
18
10
9.4
20
20
18
38
26
22
15
30
30
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
30
30
23
30
30
30
15
20
30
-35
0
0
22
0
22
0
22
0
22
0
22
0
20
22
40
25
25
0
30
0
25
17
30
25
30
Slope
ΔSOC
Mg-1
biomass
yr-1
0.076
0.017
0.024
0.21
0.04
0.1
0.07
0.06
-0.04
0.02
0.14
0.02
0.25
0.23
0
0
0
0.025
0.133
1.44
0.153
0.135
0.229
----
MAR
Mg
ha-1
yr-1
7.31
8.62
5.5
7.14
7.54
5.77
6.13
8.81
9.1
9.03
8.65
8.4
8.64
7.33
6.65
7.4
7.8
7.9
6
6.8
6.4
6.87
6.6
8.12
7.2
8.25
6.68
18
4
22
11
6
11
8
13
13
18b
14
17
21
21
20
20
23
MN
NE
NE
SD
SD
SD
WI
KS
KS
MN
KS
MT
MT
MT
MT
MT
OH
408
369
366
500
530
500
330
324
324
408
320
754
690
690
886
886
244
44
41
41
44
44
44
43
39
39
44
-48
47.5
47.5
48
48
40
95
63.2
6.2
97
96
70.8
76.5
10.5
10.5
10
14
9
10
8
10
25
11
11
10
42
-4
4
--14
CS
2
1.27
175
350
22
30
30
-6.82
C
1
1.4
6.5 150
300
9.5
15
10
-6
C
1
1.3
6.5 90
310
12.7
30
0
0.18
0
96
58
7.2
C
1
1.4
6.4 420
185
18
15
25
3.19
8
96
60
6.3
CS
2
1.3
7
135
280
26
15
20
-4
96
58
7.2
CS
2
1.4
6.4 420
185
18
15
25
3.86
6.2
89
79
7.6
C
1
1.4
6.7 100
300
19
20
25
0.043
5.1
96
84
12.8
SSr
2
1.36
5.5
264
12.4
15
22
0.1
4.1
96
84
12.8
SSr
2
1.4
5.5
264
12.4
15
0
0.27
3.2
95
63.2
6.2
S
1
1.27
200
380
22
30
30
-6.96
---W
1
----13
-25
-4.7
104
36
5
W
1
1.4
6.8 -200
17
---0.65
104
34
6
WPBCd 3
1.4
6.1 350
325
12.1
20
0
0.33
4.7
104
34
6
WPBC
3
1.4
6.1 350
325
12.1
20
8
1.18
4.1
110
30
5.5
WLP
2
1.31
8.3 230
260
15.6
20
0
0.072
1.04
110
30
5.5
WLP
2
1.31
8.3 230
260
15.6
20
10
0
-83
93.2
11
W
0
1.3
6.5 180
260
11.4
15
0
0.05
2.3
straw
15
OR
455
46
119
40.5
11
45
W
1
10
6.8 120
180
12.5
60
25
0.18
4.9
24
OR
438
42
118
40
11
30
wWF
1
1.37
6.8 120
180
12.5
60
23
0.66
7.8
24
OR
438
42
118
40
11
22
wWF
1
1.37
-120
180
12.5
60
25
0.152
5.8
24
OR
438
42
118
40
11
10
wWP
2
1.37
5.8 120
180
12.5
60
25
16.1
5.2
16
WS
553
47
118
25
10
23
W
1
-6.8 120
180
8.7
-25
-2.7
a1=[2, 5, 19]; 2=[17]; 3=[3]; 4=[30]; 5=[10]; 6=[6, 7]; 7=[31]; 8=[29]; 9=[8, 15]; 10=[26, 32]; 11=[23]; 12 = [1]; 13= [12]; 14 (Hobbs as reported by Rasmussen et al., 1980=[13,
24]; 15=[22, 24, 25]; 16=[14, 24]; 17=[4, 24], 18 = [8, 15]; 19 =[11, 16, 21]; 20 = [27]; 21=[28] (excluding WPCB rotation form CT calculation, if included slope became
negative); 22 = [9]; 23=[18]; 24=[20, 25]
bB=barley, C=corn, F=fallow, L=other legume, P= pea, R=multiple rotation combinations, S=soybean, Sr=sorghum, T=tomato, W=wheat, wW=winter wheat
cHuggins et al., [15] – reported minimum shoot and root C, using Shoot:root ratio of 0.97 for corn and 1.22 for soybean, estimated the amount of C from shoot, assuming shoot C
concentration was 43%.
dEstimated texture from soil type if not included in publication, using average from official soil series description (http://soils.usda.gov/technical/classification/osd/index.html)
used to estimate and a general bulk density based on texture (http://www.pedosphere.ca/resources/bulkdensity/triangle_us.cfm).
eExcluded from corn based as corn was grown in one of possible rotation combinations.
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