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This article in SSSAJ

  1. Vol. 52 No. 4, p. 1076-1081
    Received: Dec 23, 1985

    * Corresponding author(s):
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Soil Organic Carbon, Nitrogen, and Phosphorus Quantities in Northern Great Plains Rangeland

  1. R. Aguilar  and
  2. R. D. Heil
  1. College of Agric., Univ. of Hawaii, Hilo, HI 96720
    Agric. Exp. Stn., Colorado State Univ., Fort Collins, CO 80523



Soils were characterized in North Dakota rangeland along toposequences formed in sandstone, siltstone, and shale parent materials to evaluate quantities of organic C, N, P, and total P. Distribution of these soil constituents varied systematically with parent material and landscape position along the three toposequences, and generally increased upon moving downslope. The fine-textured soils formed in shale had greater quantities of organic C, N, and total P than the coarser-textured soils derived from sandstone and siltstone parent materials. Soils formed in sandstone had greater quantities of organic P on all landscape segments. Greater quantities of organic constituents on lower landscape segments were attributed to both greater vegetative productivity and accretion of soil organic matter through sediment deposition. Variable total-P contents along the toposequences reflected changes in parent material and redistribution of sediments by erosion.

Contribution from the Dep. of Agronomy, Colorado State Univ., Fort Collins, CO 80523.

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