Corn/Soybean Rotation Effect as Influenced by Tillage, Nitrogen, and Hybrid/Cultivar
1991
Meese, B.G. | Carter, P.R. | Oplinger, E.S. | Pendleton, J.W.
Information from the northern Corn Belt comparing tillage systems and corn (Zea mays L.)/soybean [Glycine max. (L.) Merr.] rotations over years is limited. Field studies were conducted near Arlington, WI for 3 yr (1987–1989) on a Plano silt loam soil (fine-silty, mixed, mesic Typic Argiudoll). The objectives were to determine the influence of tillage, N fertilizer level, and hybrid/cultivar on growth and grain yield of corn and soybean grown in various rotation sequences. Yields of both corn and soybean declined with consecutive years of monocropping, but only soybean had 15% lower yields with annually alternating corn and soybean than for the 1st yr of production following several years of the other crop. For the least “monocropping-sensitive” hybrid (Pioneer 3737) or cultivar (BSR 101) evaluated and for either corn hybrid under conventional tillage (CT), the yield benefit of 1st yr compared to continuous cropping was similar for corn and soybean at about 15%. But with corn hybrid DeKalb 524 under no-till (NT), and the brown stem rot (BSR) (caused by Phialophora gregata) susceptible soybean cultivar in 1987 and 1989, yields were more than 25% higher for 1st yr crop production. Average NT yields were similar to CT for both crops with 1st yr or alternate corn and soybean, but yields were usually lower under NT with monocropping.
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