Long-term effects of repeated N fertilization and straw application in a jack pine forest. 1. Twenty-two-year growth response

Sample plots in a 45-year-old jack pine (Pinus banksiana Lamb.) stand were fertilized six times with N or N, P, and K in a 10-year period to maintain four foliar N regimes. Volume growth response 3.6% above controls was obtained by repeated applications of 56 kg N.ha-1 associated with the target fol...

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Bibliographic Details
Published inCanadian journal of forest research Vol. 25; no. 12; pp. 1978 - 1983
Main Authors Weetman, G.F, Dallaire, L.C, Fournier, R
Format Journal Article
LanguageEnglish
Published 01.12.1995
Subjects
application rate
basal area
growth rate
increment
nitrogen
nitrogen fertilizers
NPK fertilizers
nutrient availability
Pinus banksiana
straw
volume
Quebec
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Summary:Sample plots in a 45-year-old jack pine (Pinus banksiana Lamb.) stand were fertilized six times with N or N, P, and K in a 10-year period to maintain four foliar N regimes. Volume growth response 3.6% above controls was obtained by repeated applications of 56 kg N.ha-1 associated with the target foliar N concentration of 1.4%. Application of 1344 kg N.ha-1 over 10 years killed trees and reduced growth. Growth response lasted 3 to 5 years after the application of 336 kg N.ha-1 and 7 to 9 years after the applications of 672 and 1344 kg N.ha-1. Additions of P and K with N did not produce a significant difference in growth, based on diameter data. Volume growth response to a single application of straw was similar to that obtained by repeated N additions, and lasted for 11 years.
ISSN:0045-5067
1208-6037
DOI:10.1139/x95-213