Research Article
Effects of 24 Years of Conservation Tillage Systems on Soil Organic Carbon and Soil Productivity
Table 2
Rainfall data for 1989–2012 growing season at Dixon Springs in Southern Illinois.
| Year |
Rainfall (cm) | April | May | June | July | August | September | Growing season |
| 1989 | 6.1 | 4.1 | 14.3 | 12.8 | 10.0 | 4.6 | 51.9 | 1990 | 14.5 | 28.2 | 4.4 | 6.4 | 10.5 | 8.8 | 72.8 | 1991 | 12.5 | 8.9 | 1.8 | 3.7 | 4.0 | 12.4 | 43.3 | 1992 | 6.1 | 6.7 | 7.6 | 13.4 | 3.9 | 19.1 | 56.8 | 1993 | 12.3 | 13.0 | 17.8 | 13.4 | 10.9 | 19.4 | 86.8 | 1994 | 16.2 | 1.5 | 10.2 | 6.0 | 9.8 | 7.0 | 50.7 | 1995 | 17.7 | 22.0 | 15.2 | 7.3 | 8.2 | 4.8 | 75.2 | 1996 | 14.8 | 14.2 | 9.0 | 13.1 | 1.4 | 14.8 | 67.3 | 1997 | 9.5 | 14.9 | 14.5 | 5.8 | 7.5 | 4.0 | 56.2 | 1998 | 15.3 | 6.5 | 19.3 | 10.3 | 11.8 | 2.5 | 65.7 | 1999 | 10.3 | 6.8 | 16.8 | 10.0 | 2.3 | 1.5 | 47.7 | 2000 | 6.2 | 15.8 | 15.1 | 6.8 | 3.8 | 8.3 | 56.0 | 2001 | 6.0 | 8.4 | 9.3 | 15.9 | 9.8 | 9.3 | 58.7 | 2002 | 19.0 | 24.7 | 3.1 | 5.1 | 7.2 | 18.8 | 77.9 | 2003 | 12.4 | 32.2 | 11.9 | 4.0 | 13.5 | 12.6 | 86.6 | 2004 | 6.5 | 13.5 | 5.4 | 8.1 | 4.8 | 0.0 | 38.3 | 2005 | 10.0 | 4.7 | 6.5 | 10.8 | 18.2 | 6.8 | 57.0 | 2006 | 7.5 | 10.2 | 7.0 | 21.3 | 7.7 | 21.3 | 75.0 | 2007 | 8.2 | 7.3 | 7.1 | 9.9 | 4.5 | 7.4 | 44.4 | 2008 | 11.6 | 6.6 | 5.8 | 11.6 | 7.0 | 3.2 | 45.8 | 2009 | 12.9 | 20.0 | 9.9 | 34.7 | 9.4 | 13.2 | 99.9 | 2010 | 8.8 | 12.2 | 10.5 | 6.8 | 9.2 | 8.5 | 55.2 | 2011 | 35.3 | 21.4 | 20.6 | 11.1 | 7.8 | 16.6 | 112.6 | 2012 | 3.3 | 1.6 | 3.0 | 9.4 | 6.7 | 13.2 | 37.1 | 1989–2012 average | 11.0 | 12.1 | 9.8 | 9.8 | 7.9 | 9.5 | 59.8 | 30-year average | 12.3 | 13.9 | 10.3 | 10.2 | 8.3 | 9.4 | 64.4 |
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