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This article in AJ

  1. Vol. 81 No. 5, p. 727-731
     
    Received: Sept 2, 1988
    Published: Sept, 1989


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doi:10.2134/agronj1989.00021962008100050005x

Crop Yield as Affected by Rotation and Nitrogen Rate. I. Soybean

  1. Todd Andrews Peterson  and
  2. G. E. Varvel
  1. U SDA-ARS, U.S. Dairy Forage Res. Ctr., Soil Sci. Dep., Univ. of Minnesota, St. Paul, MN 55108
    U SDA-ARS, Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583

Abstract

Abstract

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.

Joint contribution of Nebraska Agric. Res. Div. and USDA-ARS, Journal Series no. 8585. Part of a thesis submitted by the senior author in partial fulfillment of requirements for the Ph.D. degree

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