Abstract

Long-term field experiments in Norway spruce stands on fertile sites (site indices 27-35 m) in southwestern Sweden were analysed with respect to volume increment. Three treatments were included (0 = No fertilization, N = Fertilization with N, NP = Fertilization with N and P).Volume growth was monitored for 18 years in 10 blocks. No significant differences in annual volume increment between the treatments were detected. Volume increments in the N treatment were 97%, 99% and 107% as high as those in the 0 treatment for the periods 1-5, 6-10 and 11-15 years after the first fertilization. Corresponding values for the NP treatment were 104%, 108% and 110%, indicating that P has a small positive effect.The amount of N-fertilization would correspond to an annual N deposition of 20 kg ha(-1) during the next 30 years in southwestern Sweden. For this period, the results imply that this N deposition would not affect the growth of Norway spruce stands on fertile sites.

Keywords

FOREST YIELD; NITROGEN DEPOSITION; NITROGEN FERTILIZATION; NORWAY SPRUCE; PHOSPHORUS FERTILIZATION

Published in

Plant and Soil
1995, Volume: 168, pages: 249-254
Publisher: KLUWER ACADEMIC PUBL

SLU Authors

• Eriksson, Harry

  • Department of Forest Yield Research, Swedish University of Agricultural Sciences
    

• Johansson, Ulf

  • Unit for Field-based Forest Research, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Forest Science


Publication identifier

DOI: https://doi.org/10.1007/BF00029335

Permanent link to this page (URI)

https://res.slu.se/id/publ/79202