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Erosion on Highly and Non-Highly Erodible Cropland, by Region and Year

Estimates presented here are based upon the latest information from the National Resources Inventory (NRI). The NRI is a longitudinal sample survey based upon scientific statistical principles and procedures. It is conducted by the U.S. Department of Agriculture's Natural Resources Conservation Service (NRCS), in cooperation with Iowa State University's Center for Survey Statistics and Methodology. These results are based upon the 2007 NRI, which provides nationally consistent data for the 25-year period 1982–2007. Estimates here cover the contiguous 48 states. Separate estimates include Hawaii, Alaska, and the Caribbean.

Margins of error are reported for each NRI estimate and must be considered at all scales of analysis. The margin of error is used to construct the 95 percent confidence interval for the estimate. The lower bound of the interval is obtained by subtracting the margin of error from the estimate; the upper bound is obtained by adding the margin of error to the estimate. A 95 percent confidence interval means that in repeated samples from the same population, 95 percent of the time the true underlying population parameter will be contained within the lower and upper bounds of the interval.

Table 39. Erosion on Highly Erodible (HEL) Cropland and Non-Highly Erodible (Non-HEL) Cropland, by Farm Production Region and Year,
in Millions of Tons per Year, with Margins of Error
Region Year Highly Erodible (HEL) Cropland Non-Highly Erodible (Non-HEL) Cropland
Erosion on Land Eroding At or Below Soil Loss Tolerance Rates (T) Erosion on Land Eroding Above Soil Loss Tolerance Rates (T) Erosion on Land Eroding At or Below Soil Loss Tolerance Rates (T) Erosion on Land Eroding Above Soil Loss Tolerance Rates (T)
Erosion at T Erosion above T Total Erosion Erosion at T Erosion above T Total Erosion
Appalachian 1982 3.9
±0.3
21.2
±0.8
88.5
±4.6
109.7
±5.1
19.5
±0.6
12.7
±0.7
8.5
±0.5
21.2
±1.2
1987 3.4
±0.3
19.1
±0.8
78.5
±4.8
97.6
±5.4
18.2
±0.6
12.1
±0.6
7.4
±0.4
19.5
±0.9
1992 3.9
±0.2
14.8
±0.6
47.3
±2.7
62.1
±3.2
18.0
±0.6
9.9
±0.6
5.5
±0.4
15.5
±1.0
1997 4.9
±0.2
12.8
±0.5
33.4
±2.7
46.2
±3.0
16.7
±0.5
8.1
±0.6
3.7
±0.4
11.8
±0.9
2002 5.6
±0.5
10.5
±0.6
25.0
±2.1
35.5
±2.5
14.4
±0.8
6.3
±0.7
3.1
±0.4
9.4
±1.0
2007 5.6
±0.7
9.5
±0.8
22.9
±3.2
32.4
±3.7
13.2
±0.8
4.3
±0.7
2.4
±0.6
6.8
±1.3
Corn Belt 1982 7.3
±0.4
75.0
±1.7
299.5
±7.6
374.5
±8.8
131.7
±1.7
94.9
±2.0
81.2
±2.1
176.1
±3.9
1987 8.0
±0.4
70.4
±1.6
231.5
±7.2
301.9
±8.3
127.8
±1.6
72.9
±1.5
54.0
±1.6
126.9
±2.8
1992 8.8
±0.4
61.0
±1.6
156.5
±5.7
217.6
±6.9
129.5
±1.6
46.9
±1.4
27.0
±1.2
73.9
±2.4
1997 10.0
±0.4
58.8
±1.5
123.3
±4.1
182.1
±5.2
122.3
±1.5
32.9
±1.1
15.8
±0.9
48.7
±1.9
2002 9.2
±0.7
60.3
±2.0
136.0
±7.4
196.3
±8.7
117.9
±2.2
31.8
±1.4
14.7
±0.9
46.5
±2.2
2007 9.6
±0.9
59.6
±2.8
134.5
±8.2
194.0
±10.1
112.9
±2.8
28.7
±2.2
13.8
±1.5
42.6
±3.6
Delta States 1982 0.6
±0.1
7.7
±0.6
32.1
±3.7
39.8
±4.0
39.1
±1.6
25.2
±1.2
11.3
±0.6
36.5
±1.6
1987 0.8
±0.1
5.6
±0.5
21.2
±2.9
26.8
±3.3
37.2
±1.3
23.3
±0.9
10.1
±0.7
33.4
±1.4
1992 0.6
±0.1
3.6
±0.4
12.3
±1.8
15.9
±2.1
36.4
±1.4
18.0
±0.9
7.6
±0.6
25.6
±1.4
1997 0.6
±0.1
3.1
±0.4
8.2
±1.2
11.3
±1.5
35.8
±1.4
15.9
±1.1
6.8
±0.5
22.7
±1.5
2002 0.6
±0.2
2.6
±0.5
7.2
±1.5
9.9
±1.9
33.7
±1.8
14.1
±1.6
6.0
±1.0
20.1
±2.5
2007 0.4
±0.2
2.5
±0.7
7.7
±6.0
10.3
±6.5
31.1
±1.7
13.1
±1.7
5.5
±1.2
18.6
±2.6
Lake States 1982 4.3
±0.3
17.0
±0.8
46.3
±3.0
63.3
±3.6
61.4
±1.9
58.6
±1.8
81.1
±3.3
139.7
±4.9
1987 4.0
±0.3
16.5
±0.7
45.9
±3.2
62.4
±3.7
59.3
±1.7
61.5
±2.0
93.3
±4.2
154.8
±5.9
1992 3.8
±0.3
13.2
±0.7
34.3
±2.6
47.5
±3.2
56.5
±1.4
55.8
±1.5
79.2
±3.1
135.0
±4.0
1997 4.5
±0.3
13.1
±0.6
29.0
±2.0
42.1
±2.4
55.8
±1.4
49.8
±1.7
68.7
±3.1
118.5
±4.4
2002 4.0
±0.6
13.4
±1.2
31.0
±3.0
44.4
±3.9
55.5
±1.8
47.4
±2.3
62.2
±4.7
109.5
±6.4
2007 4.1
±0.8
13.6
±1.3
28.9
±4.4
42.5
±5.3
55.6
±3.2
35.3
±3.1
39.2
±4.9
74.5
±7.7
Mountain 1982 22.3
±1.9
70.9
±3.3
241.9
±10.9
312.8
±13.0
20.5
±1.6
24.3
±2.1
36.1
±4.3
60.4
±6.2
1987 19.2
±1.4
68.0
±4.0
225.7
±14.5
293.7
±17.3
17.3
±1.0
24.7
±2.2
36.7
±4.3
61.3
±6.2
1992 19.7
±1.9
58.3
±3.9
173.1
±14.3
231.4
±16.9
18.4
±1.3
18.3
±1.6
21.3
±2.2
39.6
±3.5
1997 24.1
±2.3
47.2
±3.0
126.1
±9.6
173.3
±11.8
20.1
±1.3
12.4
±1.3
13.9
±1.8
26.3
±2.9
2002 22.7
±2.5
45.5
±4.2
128.8
±14.3
174.3
±16.8
17.8
±1.5
10.4
±1.3
12.5
±1.9
22.8
±3.0
2007 19.8
±2.8
42.4
±4.6
130.2
±18.4
172.6
±21.9
14.5
±2.0
12.1
±1.9
15.2
±4.2
27.3
±5.8
Northeast 1982 3.1
±0.2
10.9
±0.3
30.7
±2.0
41.6
±2.2
8.2
±0.3
4.9
±0.3
3.1
±0.2
8.0
±0.5
1987 2.7
±0.2
11.4
±0.4
31.9
±1.9
43.3
±2.2
8.3
±0.3
4.3
±0.3
2.7
±0.3
7.0
±0.6
1992 2.8
±0.2
10.3
±0.4
22.8
±1.5
33.1
±1.8
8.1
±0.3
3.9
±0.3
2.2
±0.2
6.1
±0.5
1997 3.1
±0.2
9.5
±0.5
18.6
±1.3
28.1
±1.7
8.1
±0.3
3.3
±0.3
1.7
±0.2
4.9
±0.4
2002 3.1
±0.3
8.4
±0.7
17.2
±1.5
25.7
±2.0
7.1
±0.5
3.4
±0.5
1.8
±0.4
5.2
±0.9
2007 3.4
±0.4
7.5
±0.8
15.5
±1.8
23.0
±2.5
6.3
±0.5
2.5
±0.4
1.4
±0.2
3.8
±0.6
Northern Plains 1982 26.1
±1.3
65.1
±1.9
163.8
±6.3
228.9
±7.8
142.0
±2.4
88.2
±1.7
99.5
±2.8
187.7
±4.2
1987 25.3
±1.1
65.8
±2.0
152.3
±4.9
218.1
±6.5
138.4
±2.0
89.6
±1.8
103.1
±3.3
192.7
±4.7
1992 26.1
±1.2
48.6
±1.8
97.8
±4.3
146.4
±5.6
135.8
±2.2
62.0
±1.8
56.7
±2.1
118.7
±3.6
1997 27.5
±1.2
42.7
±1.5
74.2
±3.2
117.0
±4.4
125.2
±1.9
55.8
±1.2
51.0
±2.0
106.8
±2.8
2002 26.1
±2.1
44.4
±2.7
85.9
±8.5
130.3
±10.6
125.7
±3.0
60.7
±2.8
58.8
±3.7
119.5
±6.1
2007 24.7
±2.4
42.0
±2.8
80.1
±7.3
122.0
±9.0
122.4
±3.3
64.5
±3.5
66.4
±4.7
130.9
±7.9
Pacific 1982 1.4
±0.2
14.7
±1.4
62.2
±8.7
76.9
±9.6
14.6
±1.5
10.3
±1.1
12.8
±1.7
23.1
±2.6
1987 1.5
±0.3
13.5
±1.3
60.8
±7.8
74.3
±8.8
13.7
±1.4
10.7
±1.3
12.9
±1.7
23.6
±2.9
1992 1.2
±0.2
12.6
±1.1
49.5
±9.5
62.0
±10.1
12.6
±1.3
9.8
±1.3
11.3
±2.0
21.1
±3.2
1997 1.3
±0.2
11.7
±1.1
34.4
±6.3
46.0
±6.9
12.5
±1.3
9.3
±1.3
10.5
±1.8
19.8
±3.0
2002 1.1
±0.2
11.7
±1.5
38.9
±9.2
50.6
±9.6
11.0
±1.5
9.0
±1.5
9.8
±2.1
18.8
±3.5
2007 1.7
±0.4
10.7
±2.0
32.0
±10.9
42.7
±11.7
11.1
±1.9
8.1
±1.9
10.8
±2.5
19.0
±4.3
Southeast 1982 0.8
±0.2
9.0
±0.6
29.5
±2.5
38.5
±2.9
21.6
±0.7
19.9
±0.6
12.0
±0.6
31.8
±1.1
1987 0.9
±0.2
7.1
±0.4
22.6
±1.9
29.7
±2.3
19.0
±0.7
16.8
±0.7
10.9
±0.7
27.6
±1.3
1992 0.6
±0.2
5.0
±0.5
14.8
±1.8
19.8
±2.2
16.4
±0.7
14.3
±0.6
9.0
±0.6
23.3
±1.1
1997 0.6
±0.1
3.9
±0.4
11.4
±1.4
15.4
±1.8
14.5
±0.6
13.6
±0.6
9.1
±0.6
22.7
±1.2
2002 0.6
±0.2
3.0
±0.5
8.3
±1.5
11.3
±1.9
13.4
±0.9
11.7
±1.2
7.4
±0.9
19.1
±1.9
2007 0.6
±0.2
2.3
±0.6
6.7
±3.0
9.0
±3.5
11.7
±1.2
9.4
±1.3
7.3
±1.0
16.7
±2.1
Southern Plains 1982 9.8
±0.8
52.5
±2.3
327.7
±21.5
380.2
±23.0
45.9
±1.5
49.5
±2.3
76.7
±4.6
126.2
±6.6
1987 8.5
±0.7
48.9
±2.1
276.3
±13.4
325.2
±15.0
45.3
±1.3
45.7
±1.8
68.5
±3.5
114.2
±5.0
1992 8.9
±0.6
40.3
±2.3
196.9
±13.1
237.1
±14.9
44.6
±1.2
38.3
±1.6
51.2
±2.4
89.5
±3.7
1997 11.0
±0.6
35.2
±1.9
181.8
±12.9
217.0
±14.4
44.5
±1.3
32.4
±1.4
49.7
±2.5
82.1
±3.5
2002 9.2
±1.0
32.6
±2.0
137.7
±14.6
170.3
±16.0
42.2
±2.4
31.6
±2.1
41.2
±4.4
72.8
±6.1
2007 8.8
±1.4
33.1
±3.5
136.6
±19.3
169.7
±21.0
39.4
±2.4
32.5
±2.7
37.2
±3.6
69.7
±5.9
Notes:
• Cropland includes cultivated and non-cultivated cropland.

 

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