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This article in SSSAJ

  1. Vol. 66 No. 2, p. 596-601
    Received: Mar 28, 2001

    * Corresponding author(s): liebigm@mandan.ars.usda.gov


Crop Sequence and Nitrogen Fertilization Effects on Soil Properties in the Western Corn Belt

  1. M. A. Liebig *a,
  2. G. E. Varvelb,
  3. J. W. Doranb and
  4. B. J. Wienholdb
  1. a USDA-ARS, Northern Great Plains Research Laboratory, P.O. Box 459, Mandan, ND 58554
    b USDA-ARS, Soil and Water Conservation Research Unit, 120 Keim Hall, Dep. of Agronomy, University of Nebraska, Lincoln, NE 68583


Understanding long-term management effects on soil properties is necessary to determine the relative sustainability of cropping systems. Soil physical, chemical, and biological properties were measured in a long-term cropping system study in the Western Corn Belt. Properties were evaluated after 16 yr in four crop sequences [continuous corn (zea mays L.) (CC), corn–soybean [Glycine max. (L.)] (C–SB), corn–oat (Avena sativa L.) + clover (80% sweet clover [Melilotus officinalis L.] and 20% red clover [Trifolium pratense L.])–grain sorghum [(Sorghum bicolor (L.) Moench)–soybean (C–OCL–SG–SB), and corn–soybean-grain sorghum–oat + clover (C–SB–SG–OCL)] each at three N fertilization rates (ZERO, LOW, and HIGH) to a soil depth of 30.5 cm on a Sharpsburg silty clay loam (fine, smectitic, mesic Typic Argiudolls). Nitrogen fertilization had a greater impact on soil properties than crop sequence, with management effects most pronounced at 0 to 7.6 cm. Increased N rate resulted in greater organic C, total N, and particulate organic matter (POM), but lower soil pH. Increased N rate also reduced microbial biomass by ∼20% between the HIGH and ZERO N-rate treatments. The C–SB–SG–OCL sequence possessed more potentially mineralizable N (PMN) (57 vs. 46 kg ha−1 for average of CC and C–SB) and a higher percentage of POM present as soil organic matter (17.1% for the C–SB–SG–OCL sequence vs. 13.9% for other sequences). Within the context of soil functions and cropping system performance, results from this study indicate the C–SB–SB–OCL sequence enhanced nutrient cycling efficiency, while N fertilization resulted in a trade-off between its positive effect on biological productivity and negative effect on nutrient cycling efficiency.

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Copyright © 2002. Soil Science SocietyPublished in Soil Sci. Soc. Am. J.66:596–601.