Pacific Southwest Research Station

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Research Paper

Title: Artificial ripening of sugar pine seeds

Author: Krugman, Stanley L.

Date: 1966

Source: Res. Paper PSW-RP-32. Berkeley, CA: Pacific Southwest Forest & Range Experiment Station, Forest Service, U. S. Department of Agriculture; 7 p

Station ID: RP-PSW-032

Description: Immature sugar pine seeds were collected and ripened either in the cone or in moist vermiculate. Seeds collected before the second week of August could not be artificially ripened and the causes for these failures were investigated. After the second week of August, immature seeds could be brought to maturity. A practical method for a commercial operation should be possible.

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Citation

Krugman, Stanley L. 1966. Artificial ripening of sugar pine seeds Res. Paper PSW-RP-32. Berkeley, CA: Pacific Southwest Forest & Range Experiment Station, Forest Service, U. S. Department of Agriculture; 7 p.