Table 1. Interpretation of macronutrient concentrations in current year’s foliage of five commercial conifer species of the Pacific Northwest. (From: Diagnosis and Interpretation of Forest Stand Nutrient Status, Carter, R. In Forest Fertilization Sustaining and Improving Nutrition and Growth of Western Forests. H.N. Chappell, G.F. Weetman, R.E. Miller (eds.). 1992.)