A 10-year tree and stand response of jack pine to urea fertilization and low thinning

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Abstract
This study examined the 10-yr effects of a light (20% basal area removed) low thinning and urea fertilization (336 kg N/ha) on a 45-yr-old P. banksiana Lamb. stand. Thinning had no effect other than salvaging potential mortality, while fertilization resulted in an average annual gross volume growth response of about 2 m3 ha-1 yr-1. Volume growth response to fertilization was greatest in the largest diameter trees, and continued until 10 yr after treatment. Growth response did not begin until the 2nd growing season after treatment. There were indications that fertilization had positive effects on form factor.

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