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A Multidecadal Trend of Earlier Corn Planting in the Central USA

Center for Sustainability and the Global Environment (SAGE), The Nelson Institute for Environmental Studies, Univ. of Wisconsin-Madison, 1710 University Ave., Madison, WI 53726

View larger version (17K): [in a new window]   Fig. 1. Interpolated daily progression of corn planting progress in Iowa for two 5-yr time periods at the beginning and end of the data record: 1979 to 1983 compared with 2001 to 2005.

View larger version (32K): [in a new window]   Fig. 2. State level interpolations of the day of year when (A) 10% and (B) 75% of corn planting was completed during the 1979 to 2005 time period. Each data point represents a 5-yr moving average of the actual annual quantities. Standard two character abbreviations for each state are used and apply to both A and B.

View larger version (21K): [in a new window]   Fig. 3. Regional, 12-state weighted average (by planted area) 10, 25, 50, and 75% corn planted date, respectively.

View larger version (56K): [in a new window]   Fig. 4. Trend of change in day of year when the 15-d running mean daily air temperature reaches: (A) 10°C and (B) 12.78°C over the 1979 to 2005 time period (the contour intervals are d yr–1). The light, medium, and dark gray shadings signify trends at the 90, 95, and 99% confidence intervals.