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Proceedings of the International Plant Propagator's Society

Vol. 59

Results of Supplemental Lighting to Improve Winter Rooting of Evergreen Cuttings

Gail F. Berner

pp: 468


Goal: To improve rooting success of winter propagated hardwood evergreen cuttings, and to reduce unacceptable levels of variability in rooting from year to year.

Location: Grand Haven, Michigan, approximately 5 miles from Lake Michigan. Days are short with frequent cloud cover from November-February.

Rationale: Despite a lack of data for minimum required light intensity to root evergreens, Dr. Paul Fisher of Young Plant Research recommends a minimum Daily Light Integral (DLI) of 3–5 mol·m-2·d-1 (pers. commun. 16 Oct. 2008).

Monitored greenhouse 2008 DLI values were found to be well below target values January until March, (Fig. 1).

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