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Crop Yield as Affected by Rotation and Nitrogen Rate. I. Soybean
- Peterson, Todd Andrews, Varvel, G. E.
- Agronomy journal 1989 v.81 no.5 pp. 727
- Zea mays, Glycine max, crop yield, crop rotation, nitrogen fertilizers, fertilizer application, continuous cropping, Nebraska
- Crop rotation is reported to increase seed yield of soybean [ (L.) Merr.], but rotation effects are less pronounced than for cereal crops. This study compares yield of soybean grown in continuous monoculture with that of soybean grown (i) in a 2-yr rotation with corn [ L.]; (ii) in a 2-yr rotation with grain sorghum [ (L.) Moench]; (iii) in a 4-yr grain sorghum-oat+clover [ (L.) + 80% (L.) Lam., 20% ]-corn-soybean rotation; and (iv) in a 4-yr corn-oat+clover-grain sorghum-soybean rotation. Interactions between crop rotation and fertilizer N rate were also determined. The study was conducted for 4 yr on a Sharpsburg silty clay loam (fine, montmorillonitic, mesic Typic Argiudoll) near Mead, NE. Continuous soybean produced less seed (2.4 Mg ha−) than soybean in rotation (2.7 Mg ha− average). Rotations in which soybean followed sorghum in rotation produced higher seed yield (2.8 Mg ha−) than soybean following corn (2.6 Mg ha−), mainly because soybean following sorghum responded positively to N applications, while soybean following corn did not.