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Project Title: Response of Interior Tree Species to Fertilization.  Series 4 - Nitrogen and Sulphur Fertilization of Lodgepole Pine and Other Interior Species
Project Number: EP 886.01 Installation #25
District: Arrow Boundary Forest District
Location: Kuskanax Creek
Lat. 50 17'N - Long. 117 45'W		 Opening # 82K022-026
PFC-P66042-1 is in the same opening
Principal Researcher: R. P. Brockley
Kalamalka Forestry Centre
Vernon, BC		 Phone: (250) 260-4768
e-mail:
Rob.Brockley@gov.bc.ca

Objectives:

  • To document the magnitude and duration of growth response to nitrogen and nitrogen + sulphur fertilization in a Douglas-fir plantation.
  • To obtain foliar and soil analysis data to assist in deficiency diagnosis and the interpretation and prediction of fertilization response.

Experimental Design:

Treatments:

  • control (i.e., not fertilized)
  • 200 kg N/ha (as 46-0-0)
  • 200 kg N/ha + 75 kg S/ha (as 46-0-0/21-0-0-24S)

Layout:

  • Each treatment is applied to three circular plots (3 treatments * 3 reps/treatment = 9 plots) arranged in a completely randomized design.
  • Each plot consists of an inner measurement plot (12-m radius) surrounded by a 5­m treated buffer.
  • Each measurement plot contains 50 Douglas-fir crop trees which are measured for height and diameter growth on a three-year measurement cycle.
  • All plots were thinned to 600 stems/ha in 1992 (two years before installation establishment).
  • The plantation was 24 years old at the time of installation establishment.

History:

  • 1993 Installation establishment, fertilization, and initial assessments
  • 1994 Foliar sampling and assessment of foliage mass response
  • 1996 3-year remeasurement
  • 1999 6-year remeasurement

Status: Active

Reports and Publications: None to date.