Effect of repeated fertilization on stem growth in old stands of Pinus sylvestris in South East Norway
Haveraaen Oddvar, Frivold Lars Helgehttps://doi.org/10.17221/110/2014-JFSCitation:Oddvar H., Lars Helge F. (2015): Effect of repeated fertilization on stem growth in old stands of Pinus sylvestris in South East Norway. J. For. Sci., 61: 72-79.
We studied effects of repeated applications of nitrogen on stem growth of mature Scots pine at four sites with yield potential around 3 - 4.5 m3 ha‑1 yr‑1. Treatments included control (0) and fertilization with ammonium nitrate at 100 and 200 kg N ha‑1. Some plots were supplied with corresponding doses of urea. Applications were repeated up to five times, at five to twenty years intervals. Plot size was 22 x 22 m with buffer zones of 4 m. Measurements were made on an inner plot, 14 x 14 m. Tree ring widths usually reached a maximum two to four years after fertilization, returning to about the original level after seven to ten years. Responses were larger to 200 than to 100 kg N ha‑1. Annual volume increment over the experimental period was 1.5 to 2.0 m3 ha-1 larger in plots provided with 200 kg N ha-1 than in control plots, or even more as the buffer zones of 4 m did not completely exclude tree roots from growing into neighbouring plots.Keywords:nitrogen; Scots pine; tree ring widths; volume incrementReferences:
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