Effects of Tree Spacing and Height Reduction on Cone Production in Two Douglas-Fir Seed Orchards
1994 ◽
Vol 9
(1)
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pp. 5-7
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Abstract Two treatments involving tree spacings (12 and 24 ft) within rows spaced 24 ft apart and height control (topped or not topped at 20 ft) were evaluated in 17- and 22-yr-old coast Douglas-fir (Pseudotsuga menziesii var. menziesii) seed orchards. Treatment differences for cone production were not significant because of the large tree-to-tree variation in cone production and, at one orchard, the confounding of location with treatment. Cone production in 1990 averaged slightly more than 2 bushels per tree (range 0 to 11.7 bushels). Average production per 96 linear ft of orchard row was 14.8 bushels. West. J. Appl. For. 9(1):5-7.
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1979 ◽
Vol 9
(2)
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pp. 193-200
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1996 ◽
Vol 128
(6)
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pp. 1065-1076
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1985 ◽
Vol 117
(10)
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pp. 1223-1230
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