Soybean Nitrogen Contribution to Corn and Sorghum in Western Corn Belt Rotations

By G. Varvel, W. Wilhelm. 2003

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Nitrogen Response and Economics for Irrigated Corn in Nebraska (2011, background): “Mean response to N and EONR diff ered by crop sequence as others have found (Varvel and Wilhelm, 2003; Bergerou et al., 2004; Ferguson et al., 2000; Shapiro et al., 2009).”
An Algorithm for Corn Nitrogen Recommendations Using a Chlorophyll Meter Based Sufficiency Index (2007, background): “In addition, maximum grain yields were generally greater for the soybean–corn system than for the monoculture corn system (Varvel and Wilhelm, 2003).”
Evaluating Management Zone Optimal Nitrogen Rates with a Crop Growth Model (2006, background): “The reported amount of N contribution from soybean to corn in rotations has varied from |30 to 75 kg ha N (Blevins et al., 1990; Ding et al., 1998; Varvel and Wilhelm, 2003).”
Tillage and rotation effect on corn–soybean energy balances in eastern Nebraska (2007, background): “Crop rotations with legumes are assumed to be energetically favorable to those without legumes due to reduced N fertilizer inputs (Strasil, 1990; Varvel and Wilhelm, 2003).”
Identifying factors controlling the continuous corn yield penalty (2013, background): “It is widely recognized that corn grown in rotation with legume crops requires less fertilizer N than CC systems to reach maximum yields (Shrader et al., 1966; Peterson and Varvel, 1989; Meese et al., 1991; Varvel and Wilhelm, 2003).”