Longleaf pine flowering in response to nitrogen fertilization, branch girdling, growth substances, and cultivation

R.C. Hare; E.B. Snyder; R.C. Schmidtling

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Longleaf pine flowering in response to nitrogen fertilization, branch girdling, growth substances, and cultivation

Informally Refereed

Authors:

R.C. Hare, E.B. Snyder, R.C. Schmidtling

Year:

1977

Type:

General Technical Report

Station:

Northern Research Station

Source:

In: Proceedings of the Thirteenth Lake States Forest Tree Improvement Conference; Gen. Tech. Rep. NC-50. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station. 11-16

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Abstract

Biweekly applications of 400 µg GA_4/7 plus 25 µg NAA per bud from June 1 to August 10 promoted male and female flowering in longleaf pine (Pinus palustris Mill.), especially when combined with partial branch girdling and NH₄N0₃ fertilization. Fertilization was the most effective single factor, and girdling was second. Cultivation had no significant effect on flowering. Vegetative bud growth was doubled by GA-NAA, independent of fertilizer stimulation.

Parent Publication

Proceedings of the 13th Lake States Forest Tree Improvement Conference, August 1977.

Citation

Hare, R.C.; Snyder, E.B.; Schmidtling, R.C. 1977. Longleaf pine flowering in response to nitrogen fertilization, branch girdling, growth substances, and cultivation. In: Proceedings of the Thirteenth Lake States Forest Tree Improvement Conference; Gen. Tech. Rep. NC-50. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station. 11-16