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Abstract

 

doi:10.2134/jeq1985.00472425001400040020x

Wood Residue and Fertilizer Amendment of Bentonite Mine Spoils: I. Spoil and General Vegetation Responses1

  1. J. A. Smith,
  2. G. E. Schuman,
  3. E. J. De Puit and
  4. T. A. Sedbrook2

Abstract

Abstract

Bentonite mine spoils in the northern Great Plains are difficult to rehabilitate and manage because of extreme saline-sodic conditions and high percentage of 2:1 expanding clays. Wood residue and N fertilizer amendments have been shown to promote vegetation establishment on bentonite mine spoils. This study was conducted to determine wood residue and N fertilizer levels necessary to revegetate these mine spoils. Treatments included 0, 45, 90, and 135 Mg ha−1 of dry ponderosa pine wood residue and N fertilizer rates of 0, 2.5, 5.0, and 7.5 kg N Mg−1 of residue. A uniform P fertilization rate of 90 kg P ha−1 was used across all treatments. The greatest increase in seeded plant density, canopy cover and aboveground biomass occurred at 90-Mg ha−1 wood residue fertilized at 2.5 kg N Mg−1 of residue. Spoils amended at these levels exhibited a mean first-year plant density of 59 seedlings m−2, second-year plant canopy cover of 67% and second-year plant biomass (dry weight) of 2060 kg ha−1 compared to the zero wood residue treatment which had a plant density of 14 seedlings m−2, 8% plant canopy cover, and 80-kg ha−1 plant biomass.

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