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Partial Sterilization of Douglas-Fir Seedbeds with Formalin and Chloropicrin

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The two partial soil sterilants, chloropicrin and formalin, were used in an attempt to remedy fertility deterioration at two nurseries on the Vancouver Island, B.C. Both increased height growth and shoot dry weight of one-year-old Pseudotsuga menziesii seedlings at two nurseries, and seedling density at one. Chloropicrin treatments were more effective than formalin, and in two instances the high treatments of both were more effective than the low. Total dry weight production was almost doubled by chloropicrin at one nursery. Soil ammonia and seedling nitrogen content were increased by treatment, but neither these increases, nor control of nematodes (which were rare), explained the response. Explanation in terms of control of fungi or change in several soil factors has been suggested.

Document Type: Journal Article

Affiliations: Nursery Research for the British Columbia Forest Service, and Presently on Educational Leave of Absence at the Dept. Botany, Univ. College of Wales, Aberystwyth, U. K.

Publication date: September 1, 1963

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