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USDA-ARS, U.S. Dairy Forage Res. Ctr., Soil Sci. Dep., Univ. of Minnesota, St. Paul, MN 55108
USDA-ARS, Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583
* Corresponding author.
Crop rotation is reported to increase seed yield of soybean [Glycine max (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 [Zea mays L.]; (ii) in a 2-yr rotation with grain sorghum [Sorghum bicolor (L.) Moench]; (iii) in a 4-yr grain sorghum-oat+clover [Avena sativa (L.) + 80% Melilotus officinalis (L.) Lam., 20% Trifolium pratense]-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–1) than soybean in rotation (2.7 Mg ha–1 average). Rotations in which soybean followed sorghum in rotation produced higher seed yield (2.8 Mg ha–1) than soybean following corn (2.6 Mg ha–1), mainly because soybean following sorghum responded positively to N applications, while soybean following corn did not.
Received for publication September 2, 1988.
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