In the North Thompson drainage at Pyramid Creek, the initial results of a fertilization trial on Pseudotsuga menziesii (Douglas-fir), Thuja plicata (western red cedar) and Picea glauca x engelmannii (hybrid spruce) have been completed. One-hundred trees of each species were fertilized with 16-6-8 teabag fertilizer with an additional one-hundred trees of each species identified as controls. The purpose of the trial is to determine if fertilization at the time of planting will both increase seedling height and caliper and result in the reduction or elimination of brushing, and result in the achievement of minimum free-growing heights at an earlier date. The initial results of the trial indicate that all three species have significant responses to fertilization particularly in diameter growth. The fertilized hybrid spruce ground level diameter (GLD) is 19 percent larger than its control. The fertilized Douglas-fir is 11 percent larger than its control and the fertilized western redcedar is 9 percent larger than its control. Foliar analysis indicates that all three of the species have benefited with increased levels of macro and micronutrients with Douglas-fir showing the greatest response. It is anticipated that future assessments will confirm the use of fertilization as a method to reduce suppression and mortality due to brush competition through increased growth of crop trees. Second Growth Consulting Ltd.
Gilbert Smith Forest Products Ltd.. 2003. Teabag fertilization at planting on Pseudotsuga menziesii, Thuja plicata and Picea glauca x engelmannii: first Growing Season Results. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2003MR152