3 - Trees in polyhedral maps by Barnette D. W.

By Barnette D. W.

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Forestry Commun. Bull. 43. 184 p. Allen, G. S. 1956. The effect of date of cone collection upon the viability, germination behavior, and storage characteristics of western hemlock seed. Forestry Chronicle 32:262-263. Allen, G. S. 1957. , and room temperature. J. Forestry 55:278-281. Allen, G. S. 1958. Factors affecting the viability and germination behavior of coniferous seed. Part II. ) Franco. Forestry Chronicle 34:275-282. 24. 25. 26. 27. 28. 29. 30. 31. 32. Allen, G. S. 1960. Factors affecting the viability and germination behavior of coniferous seed.

ISTA [66] specifies weighing eight random samples of 100 seeds each from the pure-seed component; however, some laboratories use two or more samples of 500 seeds each. When means of replicates vary more than 10%, additional samples should be weighed. All weights should be accurate to three significant digits. 1 Tests to estimate seed viability Germination potential, perhaps the most important quality measurement in seed testing, is used to determine sowing rates as well as whether seed must be sown immediately or can be stored.

Forestry Comm. (London): 27-28. Chappell, T. W. 1968. Harvesting pine cones with mechanical tree shakers. , Forest engineering conf. American Society of Agric. Engineers, St. Joseph, Michigan. Ching, T. M. 1959. Activation of germination in Douglas -fir seed by hydrogen peroxide. Plant Physiology 34:557-563. Ching, T. M. 1960. J. Forestry 58:959-961. Ching, T. , and K. K. Ching. 1962. Physical and physiological changes in maturing Douglas-fir cones and seeds. Forest Sci. 8:21-31. Clark, B. E. 1954.

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