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Angie Peltier


Angie Peltier
Former Extension Educator, Commercial Agriculture



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Hill and Furrow

Current topics about crop production in Western Illinois, including field crops research at the NWIARDC in Monmouth.
Figure 2. 2011 Corn yield deviations from trend.
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How did 2011 corn and soybean yields measure up?


University of Illinois Agricultural Economist, Dr. Gary Schnitkey, compiled 2011 Illinois average yield data by county. Dr. Schnitkey used county yield data from 1972 to 2010 to find yield trends over time and to predict 2011 Illinois yields based on this 38-year trend. He then compared the predicted yield trend with actual yield data to determine how much 2011 corn and soybean yields deviated from the trend lines.

Corn. Many counties in Illinois had yields that were drastically below yield trends (Figure 1), with Alexander and Madison counties yielding 43 and 34 bu/A below trends, respectively. Deviations from the 38-year corn yield trend in the counties in Northwestern Illinois are listed in Table 1.

Boone and McHenry Counties were two of the four counties that had yields above the yield trend, yielding 15 and 17 bu/A above trends, respectively (Figure 1).

Soybean. Eighteen counties had soybean yields that were more than 5 bu/A below the yield trend (Figure 2). Boone and LaSalle county soybean yields were 10 and 9 bu/A above the yield trend. Soybean yield deviations from the trend in the counties surrounding the NWIARDC are listed in Table 1.

Table 1. Deviation from the 38-year yield trend of 2011 corn and soybean yields in Northwestern Illinois counties

Illinois County

Yield Deviations from Trend

bu/A

Corn

Soybean

Adams

-25

-5

Brown

-27

-7

Fulton

-18

1

Hancock

-30

-4

Henderson

-12

3

Henry

2

8

Knox

-8

7

Mason

-21

-3

McDonough

-15

5

Mercer

-9

0

Peoria

-8

5

Rock Island

2

7

Schuyler

-23

-3

Stark

0

4

Warren

-4

3

To access Dr. Schnitkey's original post on this topic, please visit the University of Illinois' farmdocDAILY website (http://www.farmdocdaily.illinois.edu/2012/04/2011_corn_and_soybean_yields_i.html).


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