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Wind Erosion on 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 37. Wind Erosion on Cropland, by Farm Production Region and Year, with Margins of Error
Region Year Million Tons per Year Tons per Acre per Year
Corn Belt 1982 85.4
±1.8
0.9
±0.0
1987 68.0
±1.3
0.7
±0.0
1992 38.5
±1.2
0.4
±0.0
1997 22.4
±0.9
0.3
±0.0
2002 16.5
±1.4
0.2
±0.0
2007 15.9
±1.6
0.2
±0.0
Lake States 1982 145.4
±4.5
3.3
±0.1
1987 162.4
±6.2
3.8
±0.1
1992 143.3
±4.2
3.5
±0.1
1997 130.3
±4.0
3.2
±0.1
2002 120.9
±5.1
3.1
±0.1
2007 87.3
±6.3
2.3
±0.2
Mountain 1982 333.1
±13.0
7.7
±0.2
1987 316.1
±15.1
7.9
±0.3
1992 250.0
±15.1
6.7
±0.3
1997 189.5
±10.2
5.1
±0.3
2002 189.4
±15.5
5.4
±0.4
2007 189.9
±19.7
5.7
±0.5
Northern Plains 1982 327.4
±6.1
3.5
±0.1
1987 333.9
±5.4
3.6
±0.1
1992 236.6
±4.9
2.7
±0.1
1997 206.1
±4.6
2.4
±0.0
2002 225.3
±9.7
2.6
±0.1
2007 229.3
±9.3
2.7
±0.1
Pacific 1982 47.4
±8.3
2.1
±0.4
1987 42.0
±5.9
2.0
±0.3
1992 48.9
±8.1
2.4
±0.4
1997 41.2
±6.9
2.1
±0.3
2002 45.8
±9.3
2.3
±0.5
2007 39.3
±12.8
2.0
±0.6
Southern Plains 1982 445.7
±23.1
9.9
±0.4
1987 382.2
±15.6
9.0
±0.3
1992 277.2
±13.8
7.2
±0.3
1997 257.0
±13.7
7.0
±0.3
2002 204.1
±15.0
5.8
±0.4
2007 203.5
±19.3
6.2
±0.6
Notes:
• Cropland includes cultivated and non-cultivated cropland.

 

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