• Worthley, Thomas Everett
  University of Maine Graduate School
  

Growth rates and foliar nutrition following fertilization were investigated in a 41 year old Norway Spruce plantation located on the Dwight B. Demeritt Forest of the University of Maine.

The fertilizer treatment applied to randomly selected plots in May, 1974 was the equivalent of 300 lbs N per acre, 300 lbs P2O5 per acre and 150 lbs K2O per acre. Beginning in the fall of 1973, current year foliage samples were taken annually from randomly selected dominant and codominant trees on fertilized and unfertilized plots, and were analyzed for percent concentration of N, P, and K. Four full growing seasons after treatment, detailed stem analyses were conducted on 4 randomly selected trees from each plot to determine 4-year periodic increments before and after treatment, and annual post fertilization increments for several growth variables.