State

Site

Location

Crop rotation

Tillage

Soil Series/texture

pH

EC (ds∙m−1)

Soil organic carbon (g∙kg−1)

Total Nitrogen (g∙kg−1)

Inorganic Nitrogen*

(mg∙kg−1)

Field Capacity (g∙g−1)

High Temp. (˚C)

Low Temp. (˚C)

Precipitation (mm)

Maine

Frenchville

N 47.2161028,

W −68.412227

Potato-grain-clover

Conventional

Plaisted gravelly loam

5.8

0.48

20

2.10

31.9

0.260

8.3

−1.1

850

Tennessee

Jackson

N 35.6230,

W −88.8465

Continuous Cotton

No-tillage

Lexington silt loam

5.4

0.32

10

1.40

47.8

0.261

21.6

9.4

1375

South Carolina

Blackville

N 33.346539,

W −81.297283

Continuous Corn

Strip-tillage

Duplin sandy loam

5.6

0.09

5.0

0.60

14.8

0.053

25.6

11

1198

Minnesota

Downer

N 46.8655,

W −96.396806

Sugarbeet- Corn

Conventional

Lamoure silt loam

8.1

0.16

15.5

1.60

14.1

0.118

11.6

0

573

North Dakota

Bismarck

N 47.4630,

W −101.2772

Spring Wheat-Soybean

No-tillage

Wilton

silt loam

7.3

0.17

21.7

2.30

32.6

0.265

12.8

−1

453

North Dakota

Dickinson

N 47.19314,

W −102.89661

Continuous Wheat

No-tillage

Vebar-Parshall fine sandy loam

5.2

0.14

17.0

1.70

16.9

0.239

12.8

−1

400

Nebraska

North Bend

N41.429308,

W −97.794056

Corn-soybean

No-tillage

Nora silty clay loam

6.7

0.10

15.4

1.80

23.3

0.120

16.1

3.9

763

Oregon

Pendleton

N 45.718439,

W −118.626883

Fallow-Winter Wheat

No-tillage

Walla Walla silt loam

6.0

0.40

12.0

1.20

29.8

0.291

17.2

5.0

322