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Corn Grain Yield Response to Crop Rotation and Nitrogen over 35 Years

^a Monsanto Company, 1920 Fifth St., Davis, CA 95616
^b Dep. of Agronomy, 1575 Linden Dr., Univ. of Wisconsin, Madison, WI 53706. Funded by CSREES project WIS0 142-4897

View larger version (21K): [in this window] [in a new window]   Fig. 1. Relationship between grain yield and time for each N rate and rotation sequence for the first year of corn at Lancaster, WI from 1970 to 2004. C, corn; S, soybean; Oa, oat with alfalfa seeding; A, alfalfa. CC, circle, --------; CCCAA, diamond, --- ---; CCOaAA, square, - - - -; CSCOaA, triangle, --- - --- -. Cycles: 1, 1970–1974; 2, 1975–1979; 3, 1980–1984; 4, 1985–1989; 5, 1990–1994; 6, 1995–1999; 7, 2000–2004. Before 1977, N rates were 0, 84, 168, and 336 kg N ha–1. Italic indicates year of rotation for the corn crop being evaluated.

View larger version (21K): [in this window] [in a new window]   Fig. 2. Relationship between grain yield and time for each N rate and rotation sequence for the second year of corn at Lancaster, WI from 1970 to 2004. C, corn; S, soybean; Oa, oat with alfalfa seeding; A, alfalfa. CC, circle, --------; CCCAA, diamond, --- ---; CCOaAA, square, - - - -; CSCOaA, triangle, --- - --- -. Cycles: 1, 1970–1974; 2, 1975–1979; 3, 1980–1984; 4, 1985–1989; 5, 1990–1994; 6, 1995–1999; 7, 2000–2004. Before 1977, N rates were 0, 84, 168, and 336 kg N ha–1. Italic indicates year of rotation for the corn crop being evaluated.

View larger version (18K): [in this window] [in a new window]   Fig. 3. Relationship between grain yield and time for each N rate and rotation sequence for the third year of corn at Lancaster, WI from 1970 to 2004. C, corn; A, alfalfa. CC, circle, --------; CCCAA, diamond, --- ---. Cycles: 1, 1970–1974; 2, 1975–1979; 3, 1980–1984; 4, 1985–1989; 5, 1990–1994; 6, 1995–1999; 7, 2000–2004. Before 1977, N rates were 0, 84, 168, and 336 kg N ha–1. Italic indicates year of rotation for the corn crop being evaluated.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Relationship between grain yield and time for each N rate and rotation sequence of corn at Lancaster, WI from 1989 to 2004. C, Corn; A, Alfalfa; S, Soybean. CC, circle, --------; CA, diamond, --- ---; CS, square, - - - -. Cycles: 1, 1989–90; 2, 1991–1992; 3, 1993–1994; 4, 1995–1996; 5, 1997–1998; 6, 1999–2000; 7, 2001–2002; 8, 2003–2004.

View larger version (24K): [in this window] [in a new window]   Fig. 5. Relationship between grain yield and time for each N rate and rotation sequence for the first year of corn at Lancaster, WI from 1990 to 2004. C, corn; S, soybean; Oa, oat with alfalfa seeding; A, alfalfa. CC, circle, --------; CCCAA, diamond, --- ---; CCOaAA, square, - - - -; CSCOaA, triangle, --- - --- -; CA, x, --------; CS, +, --- - - ---. Cycles: 1, 1990–1994; 2, 1995–1999; 3, 2000–2004. Italic indicates year of rotation for the corn crop being evaluated.