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Scarification and Fertilization of Western Redcedar and Western Hemlock

Scarification and Fertilization of Western Redcedar and Western Hemlock. R.W. Negrave Coast Forest Region. Scarification and Fertilization Treatments at SCHIRP. Study Design Findings Application to management. Treatments. Two sites: CH and HA Two species: Cw and Hw

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Scarification and Fertilization of Western Redcedar and Western Hemlock

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  1. Scarification and Fertilization of Western Redcedar and Western Hemlock R.W. Negrave Coast Forest Region

  2. Scarification and Fertilization Treatments at SCHIRP • Study Design • Findings • Application to management

  3. Treatments • Two sites: CH and HA • Two species: Cw and Hw • Fertilized and un-fertilized treatments: • 225 kg/ha as urea • 100 kg/ ha as triple superphosphate • NPK at planting • Scarified and un-scarified treatments: • Hoe-raking treatment to remove salal

  4. Plots and Measurements • Treatments replicated 4X: 64 plots total • Measurement trees per plot: 64 • Established in 1988, analyzed from 2002 data: 15 growing seasons • High planting density: 2500 sph

  5. Findings • Fertilization greatly increased growth • Scarification: • Increased growth but less than fertilization • Fertilization-only treatment best on HA sites • Enhanced fertilizer response on CH sites • Tree nutrition was not enhanced by either fertilization or scarification*

  6. Applications to Management • Fertilization gives greater effect than light scarification • Heavier mechanical treatment* plus fertilization may give greater response on CH • Planting density appears critical on CH sites

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