Abstract
Red spruce (Picearubens Sarg.) near Princeton, Maine, U.S.A. fertilized with 168 kg N/h in 1970 increased in volume growth by nearly 50% over pretreatment rates during the 8-year posttreatment period; specific gravity was not affected. Average pulp yield per unit weight of posttreatment wood from fertilized trees was 1.9% greater than average yield from pretreatment wood, but rejects increased by 2.2% and kappa number by 17.7 mL. Average pulp yield per unit weight of posttreatment wood from unfertilized trees was 1.2% less than from pretreatment wood; rejects were 0.4% less and kappa number 2.6 mL higher. Fertilization increased the lignin content of posttreatment wood by about 3% and the resin content by 2%. Ash content also increased after fertilization.
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