Forest Cut-Block Trial
To determine the impact of the addition of different rates of both conventional and de-ink sludge on soils and plants.
This experimental trial was established at NE 32-58-18-W5, South of Fox Creek, Alberta in June, 1993. The experiment included:
- Three replicates
- 2 sludges- conventional and de-ink
- Four application rates - 0 cm, 3 cm, 5 cm, and 10 cm
- 2 species - lodgepole pine and white spruce
- Fertilizer was added to equalize the nutrient level in all treatments
- Sludge was incorporated with a large A2 Forester Unit to a depth of 20 cm
- Soil samples were obtained before and after sludge incorporation
- Surface samples were obtained annually from 1994 to 2005
- Deciduous species were removed from the plots in 2002/03
- Plots were thinned according to normal forestry practices
- Height and diameter of 2000 trees were measured annually from 1993 to 2007 and again in 2010.
Results and Conclusions
- All treated plots for both species had increased heights, diameters and stem volume compared to the control treatments.
- There was no significant obvious effect of scarification in the control treatment in terms of growth response.
- It is predicted that at age 25, Pine tree volume in the 10 cm sludge application will nearly double the stem volume in the control treatment. Spruce trees show similar results.
- Higher application volumes did not necessarily lead to equally larger tree volumes.
- When measurements were obtained in 2010, it was observed that the high density of the cut-block plots (~7200 stems/ha) may begin to have an effect on tree growth and success.
- Tree height and diameter age shift and growth multipliers indicate that sludge treatment has a significant effect on vegetative performance.
|Area||Application Rate (t/ha)||Age Shift||Growth Multiplier
|ANC Forest Cutblock Trial||50||8.2||7.7||1.38||1.36|
Spruce stemwood volume and projection (conventional sludge)
Spruce stemwood volume and projection (De-Ink sludge)
Pine stemwood volume and projection