376 Forestry Handbook for British Columbia Table 4: Interpretation of macronutrient concentrations in current year’s foliage of five commercial conifer species of the Pacific Northwest (from Carter, 1992). Foliar concentration (% dry mass basis) Element Interpretation Douglas-fir Lodgepole pine Western hemlock White spruce Western redcedar Nitrogen Very severely deficient Moderate to severe deficiency Slight to moderate deficiency Adequate <1.00 1.00–1.20 1.20–1.35 >1.35 1.35 <1.00 1.00–1.20 1.20–1.35 >1.35 <1.05 1.05–1.25 1.25–1.45 >1.45 <1.10 1.10–1.30 1.30–1.45 >1.45 Phosphorus Severely deficient Moderately deficient Slightly deficient Adequate <0.08 0.08–0.10 0.10–0.15 >0.15 <0.09 0.09–0.12 0.12–0.15 >0.l5 <0.11 0.11–0.15 0.1 5–0.25 >0.25 <0.10 0.10–0.14 0.14–0.16 >0.16 <0.10 0.10–0.13 0.13–0.16 >0.16 Potassium Very severely deficient Moderate to severe deficiency Slight to moderate deficiency Adequate <0.35 0.35–0.45 0.45–0.65 >0.65 <0.35 0.35–0.40 0.40–0.55 >0.55 <0.40 0.40–0.45 0.45–0.65 >0.65 <0. 25 0.25–0.30 0.30–0.50 >0.50 <0.35 0.35–0.40 0.40–0.80 >0.80 Calcium Severely deficient Moderate to severe deficiency Slight to moderate deficiency Adequate <0.1 5 0.1 5–0.20 0.20–0.25 > 0.25 <0.06 0.06–0.08 0.08-0.10 >0.10 <0.06 0.06–0.08 0.08–0.10 >0.10 <0.10 0.10–0.15 0.1 5–0.20 >0.20 <0.10 0.10–0.20 0.20–0.25 >0.25 Magnesium Severely deficient Moderate to severe deficiency Slight to moderate deficiency Adequate < 0.06 0.06–0.09 0.09–0.12 > 0.12 <0.06 0.06–0.08 0.08–0.10 > 0.10 <0.06 0.06–0.08 0.08–0.10 >0.10 <0.05 0.05–0.08 0.08–0.12 >0.12 <0.05 0.05–0.09 0.09–0.14 >0.14