Journal article

Growth and nutrition of Pinus radiata in response to fertilizer applied after thinning and interaction with defoliation associated with Essigella califomica

Peter Hopmans, Nick C Collett, Ian W Smith, Stephen R Elms

FOREST ECOLOGY AND MANAGEMENT | ELSEVIER SCIENCE BV | Published : 2008

Abstract

Infestations of Essigella californica following the installation of post-thinning fertilizer trials in Pinus radiata plantations provided an opportunity to examine the impact of repeated defoliation over a period of 8 years (1997-2005). Replicated treatments (n = 4) of nil fertilizer (control), N (300 kg ha-1) as urea, P (80 kg ha-1) and S (45 kg ha-1) as superphosphates were applied immediately after thinning at three sites and this was followed by a second application of NPS fertilizers 6 years later with N applied at 300 kg ha-1 as urea and ammonium sulphate and P at 80 or 120 kg ha-1. Defoliation of untreated P. radiata gradually increased to 50% over a period of 8 years. Basal area grow..

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University of Melbourne Researchers