Regional Variation in Growth Response of Coastal Douglas-fir to Nitrogen Fertilizer in the Pacific Northwest

Washington D.C.

1990

S. 625-640

5 Abb., 8 Tab., 15 Lit. Ang.

Bandaufführung

7380

64603

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.