Regional variation in growth response of Coastal Douglas-fir to nitrogen fertilizer in the Pacific Northwest.

Abstract

Hypothesis testing for differences in growth responses among physiographic strata, thinning levels, and fertilizer dosage levels resulted in a set of empirical models for predicting volume increment response of even aged coastal Douglas-fir to nitrogen fertilizer. Absolute and percent responses are estimated for stands both thinned and unthinned, as a function of dosage levels and physiographic provinces. Although not "highly" significant, the physiographic factor was retained in the models for purposes of refinement.

Citation

Peterson, C.E.; Hazard, J.W. 1990. Regional variation in growth response of Coastal Douglas-fir to nitrogen fertilizer in the Pacific Northwest. Forest Science. 36(3): 625-640