Abstract
Summary Potted one-year-old seedlings of four Pinus contorta -provenances were grown in vermiculite under addition of the following steps of fertilizing: V = complete fertilizing (K nop -solution), 0,5 V, 2 V, V + N, V − N, V + K, V − K. At the end of the second vegetation-period the seedlings were exposed to 3,6−4,2 mg/cm 3 SO 2 for 109 hours. Afterwards we obtained the following results: 1. Coastal provenances (Wash., Oregon) were more susceptible to SO 2 than interior ones (Idaho, Wyoming); significance p = 0,01. 2. The same level of fertilizing did not lead to a uniform reaction of SO 2 -sensitivity in all provenances tested. Possibly there exist interactions between seed source and fertilizing. 3. Differences in stem-weight, root-weight and dry-matter-content between the four populations did not coincide with their reaction against SO 2 .
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