Stimulation of Flowering in Eastern White Pine
Abstract:Fertilization of Pinus strobus L. with ammonium sulfate at the rate of 0, 18, 53, and 158 pounds of N per acre, root pruning, and strangling and girdling of branches were tested for inducing and stimulating flowering. Neither fertilizer nor mechanical injury induced flowering in 3- to 14-year-old trees. All treatments except strangling stimulated production of ovulate strobili in 22-year-old trees, but none increased the number of flowering trees. Girdling stimulated production of strobili on individually treated branches. Treatment in July 1959, stimulated production of ovulate strobili in 1960, whereas treatment in April 1960, did not. Treatment in the summer of the year prior to flowering increased the yield of strobili when production would have otherwise been low; no increase was apparent when production was generally high. Stimulation did not persist into a second season.
Document Type: Journal Article
Affiliations: Staff of the Connecticut Agric. Exp. Sta. New Haven, Conn.
Publication date: 1964-03-01
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