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This article in SSSAJ

  1. Vol. 58 No. 5, p. 1572-1579
     
    Received: Apr 29, 1993
    Published: Sept, 1994


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doi:10.2136/sssaj1994.03615995005800050042x

Foliar Deficiencies of Mature Southern Appalachian Red Spruce Determined from Fertilizer Trials

  1. J. D. Joslin  and
  2. M. H. Wolfe
  1. Atmospheric Science Dep., Tennessee Valley Authority, Cooperative Forest Studies Program, Bldg. 1506, Oak Ridge Natl. Lab., P.O. Box 2008, Oak Ridge, TN 37831-6034

Abstract

Abstract

A field fertilization study employing additions of Ca, Mg, and N to a mature red spruce (Picea rubens Sarg.) stand was conducted at a high-elevation site in southwestern Virginia. Statistically significant increases in needle weight (20% larger than controls) were observed after two growing seasons in treatments receiving Ca or Ca plus Mg. Significant foliar growth responses were accompanied by significant increases (20–60%) in foliar concentrations of Ca, Zn, Mg, and Mn in current-year and 1-yr-old needles. Both Ca and Mg addition, alone or together, appear to have alleviated antagonisms by Al towards the uptake of these four cations. Both the foliar growth response (negative) and the foliar N concentration response to N addition were nonsignificant, a response consistent with the evidence for N saturation at this site. Vector analysis, correlation analyses, and literature evidence all provide support at this site for a foliar deficiency of Zn at a foliar concentration of 14 mg kg−1 and for a foliar and/or root deficiency of Ca at a current-year needle concentration of 1700 mg kg−1. Foliar concentrations of Ca and Zn at or below these thresholds are common in southern Appalachian red spruce and may be related to its apparent growth decline in the higher elevations.

This study was supported by the Tennessee Valley Authority and by the USDA Forest Service and the U.S. Environmental Protection Agency as part of the Spruce-fir Research Cooperative of the National Acid Precipitation Assessment Program.

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