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Proceedings of Past Forest Nursery Association Meetings:

Field Measurement of Photosynthetically Active Radiation
Draper, D.A.; Spittlehouse, D.L.; Binder, W.D.; Letchford, T.
1988: Vernon, CAN
Site preparation treatments reducing competing vegetation achieved adequate light levels for white spruce photosynthesis but did not alleviate limiting root zone soil temperature. Mechanical treatments which disturb site humus layers increased both light availability and soil temperature and resulted in increased growth performance over a 5 year period. Increased depth of mineral capping on inverted organic mounds significantly increased seedling growth performance.
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