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This article in SSSAJ

  1. Vol. 39 No. 1, p. 140-144
    Received: Apr 9, 1974
    Accepted: Oct 3, 1974

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Growth Responses of Pine and Spruce Seedlings to Regimes of Soil Moisture and Fertility1

  1. K. M. McClain and
  2. K. A. Armson2



The growth of jack pine (Pinus banksiana Lamb.), black spruce (Picea mariana (Mill) B.S.P.), and white spruce (Picea glauca (Moench) Voss.) seedlings at 4 fertility levels and 3 soil moisture regimes was studied under greenhouse conditions. Weekly height measurements were made and after a treatment period of 12 weeks dry weight and root area indices were determined. For the tops root ratios were calculated from dry weights. Growth increased with increased moisture but increased, then decreased with fertility increase. Soil fertility × moisture interaction significantly (P = 0.01) increased the dry weight of black spruce and white spruce. Maximum growth for all species occurred in the wettest moisture regime. For the spruce this occurred with the first increment in fertility above the control and with the second increment in fertility above the control for jack pine.

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