Author Description

Fertilizing Douglas-fir forests with nitrogen (N) can temporarily boost tree growth and accelerate stand dynamics. The potential, magnitude and duration of the response may vary with fertilizer dose and type, site characteristics such as soil moisture and nutrient status, environmental conditions, and tree and stand history. This report presents empirical regression equations for predicting response of thinned and unthinned immature Douglas-fir to N fertilization in some sites in the eastern variant of the very dry maritime Coastal Western Hemlock subzone. It is based on 9 years of measurement and conservation.