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Published in Soil Sci Soc Am J 39:140-144 (1975)
© 1975 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Growth Responses of Pine and Spruce Seedlings to Regimes of Soil Moisture and Fertility1

K. M. McClain and K. A. Armson2

ABSTRACT

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 x 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.

NOTES

1 Contribution of the Ontario Ministry of Natural Resources and the University of Toronto. Presented before Div. 7 Soil Science Society of America meetings at Miami Beach, Florida, 29 October 1972.

2 Research Scientist, Northern Forest Research Unit, Ontario Ministry of Nat. Res., Thunder Bay, Ont., and Professor of Forestry, Univ. of Toronto, Toronto, Ont., Canada, respectively.

Received for publication April 9, 1974. Accepted for publication October 3, 1974.






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Copyright © 1975 by the Soil Science Society of America.