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Highly Erodible 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 38. Highly Erodible (HEL) Cropland and Non-Highly Erodible (Non-HEL) Cropland, by Farm Production Region and Year, in Thousands of Acres, with Margins of Error
Region Year HEL Cropland Eroding At or Below Soil Loss Tolerance Rates HEL Cropland Eroding Above Soil Loss Tolerance Rates Total HEL Cropland Non-HEL Cropland Eroding At or Below Soil Loss Tolerance Rates Non-HEL Cropland Eroding Above Soil Loss Tolerance Rates Total Non-HEL Cropland
Appalachian 1982 3,705.1
±199.3
6,140.4
±228.1
9,845.5
±274.5
9,792.6
±204.4
2,952.4
±174.1
12,745.0
±233.1
1987 3,583.9
±168.1
5,484.4
±235.3
9,068.3
±286.4
9,352.4
±220.8
2,767.7
±143.6
12,120.1
±232.3
1992 3,821.3
±148.7
4,297.3
±182.9
8,118.6
±265.2
9,257.2
±255.0
2,262.5
±138.8
11,519.7
±263.9
1997 4,273.0
±156.9
3,733.9
±146.5
8,006.9
±204.9
9,338.6
±224.1
1,821.6
±125.3
11,160.2
±242.5
2002 4,876.1
±316.4
3,099.3
±192.4
7,975.4
±345.9
9,508.7
±358.5
1,420.7
±151.8
10,929.4
±347.0
2007 4,807.7
±490.8
2,824.3
±243.4
7,632.0
±512.5
9,472.6
±466.9
968.8
±160.3
10,441.4
±453.7
Corn Belt 1982 4,233.8
±215.5
18,363.5
±410.0
22,597.3
±475.6
47,840.2
±503.4
21,798.7
±456.2
69,638.9
±581.1
1987 4,551.6
±208.8
17,153.2
±387.2
21,704.8
±461.6
52,282.2
±509.1
16,905.3
±349.3
69,187.5
±567.7
1992 5,196.3
±250.0
14,764.4
±364.2
19,960.7
±441.7
56,686.8
±479.5
11,063.4
±321.5
67,750.2
±570.9
1997 6,206.8
±182.2
14,149.2
±361.6
20,356.0
±413.1
59,807.4
±494.6
7,787.2
±261.7
67,594.6
±554.4
2002 6,006.2
±392.9
14,469.6
±458.5
20,475.8
±543.7
59,726.3
±705.9
7,501.3
±306.3
67,227.6
±690.0
2007 5,950.6
±476.5
14,303.0
±641.0
20,253.6
±734.6
59,808.4
±973.7
6,855.4
±491.5
66,663.8
±936.2
Delta States 1982 541.5
±66.1
2,178.1
±173.0
2,719.6
±212.4
13,609.2
±544.9
5,544.9
±248.6
19,154.1
±565.9
1987 623.2
±90.1
1,593.7
±136.9
2,216.9
±153.6
13,494.1
±514.2
5,165.6
±201.2
18,659.7
±517.5
1992 530.5
±66.4
1,058.1
±106.3
1,588.6
±134.1
13,767.3
±460.2
4,013.2
±197.8
17,780.5
±510.2
1997 494.3
±62.2
884.3
±107.4
1,378.6
±124.0
13,621.9
±489.5
3,571.3
±233.9
17,193.2
±527.3
2002 496.9
±126.3
748.9
±152.7
1,245.8
±216.7
13,362.1
±610.4
3,176.9
±346.4
16,539.0
±563.7
2007 431.7
±143.5
725.7
±169.7
1,157.4
±223.2
13,086.1
±578.0
2,947.2
±377.6
16,033.3
±611.2
Lake States 1982 2,078.7
±122.7
4,064.2
±164.4
6,142.9
±204.3
25,169.7
±590.8
12,466.2
±364.4
37,635.9
±633.8
1987 2,026.5
±128.3
3,931.3
±163.6
5,957.8
±199.0
23,901.3
±570.3
13,048.4
±414.8
36,949.7
±676.2
1992 2,224.3
±151.0
3,145.6
±157.3
5,369.9
±178.8
23,915.8
±504.8
11,818.6
±308.1
35,734.4
±630.5
1997 2,221.6
±153.3
3,148.7
±126.9
5,370.3
±203.0
24,550.5
±573.3
10,558.0
±351.0
35,108.5
±673.6
2002 1,981.7
±246.7
3,183.9
±267.3
5,165.6
±318.0
24,212.3
±717.5
10,062.0
±490.7
34,274.3
±746.3
2007 1,923.7
±284.4
3,245.6
±287.9
5,169.3
±383.4
25,839.6
±807.2
7,552.0
±679.4
33,391.6
±826.7
Mountain 1982 10,609.1
±680.8
16,467.9
±711.4
27,077.0
±1,056.9
11,043.4
±640.5
5,005.4
±428.7
16,048.8
±772.5
1987 9,403.8
±465.0
15,757.7
±833.8
25,161.5
±1,033.7
10,021.4
±539.6
5,057.3
±448.5
15,078.7
±754.5
1992 9,938.9
±602.6
13,482.0
±837.8
23,420.9
±1,072.7
10,256.3
±610.6
3,735.4
±311.8
13,991.7
±705.3
1997 11,917.6
±800.9
11,115.2
±629.3
23,032.8
±1,067.8
11,486.0
±588.6
2,549.9
±257.6
14,035.9
±684.7
2002 10,886.2
±761.9
10,519.1
±924.8
21,405.3
±1,050.6
11,287.1
±891.2
2,122.4
±267.2
13,409.5
±869.6
2007 10,378.8
±1,027.7
9,822.4
±1,031.0
20,201.2
±1,139.1
10,345.8
±855.3
2,476.1
±397.6
12,821.9
±1,002.4
Northeast 1982 3,613.9
±158.3
3,397.3
±112.7
7,011.2
±191.0
8,327.3
±317.3
1,398.3
±82.2
9,725.6
±312.3
1987 3,144.0
±163.9
3,581.1
±134.7
6,725.1
±193.7
8,278.3
±318.7
1,237.5
±87.6
9,515.8
±317.2
1992 3,273.7
±125.4
3,217.5
±133.7
6,491.2
±197.2
8,079.9
±303.2
1,134.9
±79.8
9,214.8
±309.2
1997 3,333.2
±106.2
2,959.9
±142.3
6,293.1
±192.8
7,899.7
±339.8
948.8
±77.2
8,848.5
±329.7
2002 3,254.7
±255.3
2,641.5
±211.1
5,896.2
±307.2
7,463.6
±408.9
972.5
±143.7
8,436.1
±416.4
2007 3,271.3
±246.5
2,383.4
±244.1
5,654.7
±297.6
7,314.9
±419.6
738.0
±130.5
8,052.9
±448.1
Northern Plains 1982 10,458.5
±484.7
14,777.0
±409.9
25,235.5
±534.7
49,420.9
±677.1
18,668.0
±360.1
68,088.9
±732.7
1987 9,762.9
±423.4
14,852.9
±426.9
24,615.8
±554.4
49,493.8
±680.3
18,913.3
±394.9
68,407.1
±681.2
1992 10,582.8
±436.7
10,974.3
±367.1
21,557.1
±517.6
52,202.7
±640.3
13,099.9
±377.9
65,302.6
±636.9
1997 12,233.9
±459.8
9,662.7
±314.9
21,896.6
±550.5
53,992.7
±582.4
11,780.0
±260.2
65,772.7
±638.9
2002 11,896.6
±675.2
10,135.7
±605.3
22,032.3
±832.3
52,255.4
±931.4
12,818.2
±587.8
65,073.6
±1,131.8
2007 12,044.0
±859.2
9,502.1
±674.1
21,546.1
±990.7
50,763.4
±1,277.1
13,568.3
±717.0
64,331.7
±1,322.7
Pacific 1982 1,138.4
±173.7
4,109.1
±326.3
5,247.5
±410.6
14,799.8
±770.6
2,491.2
±235.2
17,291.0
±816.0
1987 1,258.0
±194.2
3,567.8
±306.6
4,825.8
±377.1
14,072.3
±753.5
2,461.5
±284.0
16,533.8
±850.5
1992 1,191.2
±196.9
3,306.0
±262.7
4,497.2
±350.7
13,842.9
±747.4
2,238.6
±282.0
16,081.5
±847.9
1997 1,242.7
±206.8
3,007.0
±256.2
4,249.7
±361.1
13,667.6
±752.1
2,129.1
±289.2
15,796.7
±858.5
2002 1,210.3
±200.2
2,968.1
±321.3
4,178.4
±375.2
13,594.5
±808.3
2,029.0
±345.0
15,623.5
±996.4
2007 1,468.4
±287.9
2,718.9
±372.8
4,187.3
±568.8
13,544.0
±1,032.0
1,825.0
±391.8
15,369.0
±1,184.4
Southeast 1982 618.2
±70.4
2,433.4
±132.1
3,051.6
±151.8
10,833.1
±371.8
4,344.4
±135.2
15,177.5
±409.6
1987 677.7
±92.5
1,956.1
±120.4
2,633.8
±144.6
10,169.1
±407.0
3,661.6
±153.8
13,830.7
±430.7
1992 573.7
±92.8
1,379.9
±128.5
1,953.6
±156.7
9,284.7
±392.1
3,123.7
±138.8
12,408.4
±417.6
1997 591.0
±57.3
1,093.1
±102.5
1,684.1
±119.0
8,404.2
±402.0
2,977.1
±132.8
11,381.3
±440.2
2002 672.6
±112.3
830.1
±126.9
1,502.7
±145.3
8,241.2
±508.1
2,530.9
±236.8
10,772.1
±537.9
2007 670.0
±152.2
630.0
±162.8
1,300.0
±240.3
7,979.1
±629.9
2,048.3
±266.3
10,027.4
±691.7
Southern Plains 1982 4,410.7
±331.6
11,923.3
±491.4
16,334.0
±578.4
18,736.4
±470.0
10,042.7
±481.4
28,779.1
±566.5
1987 3,684.9
±268.8
11,112.7
±429.7
14,797.6
±512.4
18,267.3
±469.2
9,287.6
±367.3
27,554.9
±573.4
1992 3,858.4
±245.7
9,196.9
±457.7
13,055.3
±514.3
17,864.3
±459.5
7,779.4
±337.4
25,643.7
±621.5
1997 4,194.3
±232.6
8,146.0
±366.3
12,340.3
±488.6
18,050.2
±472.5
6,587.9
±280.6
24,638.1
±607.2
2002 3,812.5
±342.9
7,495.6
±437.7
11,308.1
±566.8
17,217.3
±624.6
6,411.6
±425.0
23,628.9
±630.2
2007 3,185.5
±474.5
7,484.4
±726.1
10,669.9
±823.4
15,532.7
±727.9
6,586.3
±565.4
22,119.0
±783.1
Notes:
• Cropland includes cultivated and non-cultivated cropland.

 

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