Abstract
Results are reported from the third in a series of three industry-sponsored forest fertilization field trials established in an approximately 55-year-old jack pine (Pinus banksiana Lamb.) stand in the Dryden-Sioux Lookout area of northwestern Ontario. The experiment was of randomized block design and tested various combinations of N plus P and N plus K. The experiment was unique in that fertilizers were applied in the fall on approximately 5 cm of early snow. Significant increases over control for several parameters after both five and ten years were noted for several treatments. Best response in relation to total volume increment over ten years was to N at 112 kg/ha plus K at 93 kg/ha where 21.72 m3/ha of extra wood was produced.
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