Knygos.lt nariams
Knygos.lt nariams
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- Autorius: United States Department of Agriculture
- Leidėjas: CreateSpace Independent Publishing Platform
- ISBN-10: 1508798117
- ISBN-13: 9781508798118
- Formatas: 21.6 x 28 x 0.2 cm, minkšti viršeliai
- Kalba: Anglų
Laminated Root Rot in a Western Washington Plantation (el. knyga) (skaityta knyga) | knygos.lt
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Aprašymas
A 4-year-old Douglas-fir plantation in the western Washington Cascades was monitored for 8 years after fertilization with potassium (K), nitrogen (N), and K+N to determine fertilizer effects on rates of mortality from laminated root rot (LRR) and other causes relative to a nonfertilized control. Each element was applied at a rate of 300 lb/acre on and around 0.2-acre plots replicated seven times in a randomized complete block design. Cumulative mortality from LRR did not differ significantly among fertilizer treatments, and losses were strongly related to density of infected stumps from the previous stand (r2 = 0.74). Mortality from disease and other sources accelerated during the 8 years of monitoring. Average tree growth and stand volume were greatest in treatment N and were reduced where N was combined with K. Continued monitoring is needed to identify potential longer term effects of the fertilizer treatments on susceptibility of Douglas-fir to LRR and Armillaria spp.
- Autorius: United States Department of Agriculture
- Leidėjas: CreateSpace Independent Publishing Platform
- ISBN-10: 1508798117
- ISBN-13: 9781508798118
- Formatas: 21.6 x 28 x 0.2 cm, minkšti viršeliai
- Kalba: Anglų
A 4-year-old Douglas-fir plantation in the western Washington Cascades was monitored for 8 years after fertilization with potassium (K), nitrogen (N), and K+N to determine fertilizer effects on rates of mortality from laminated root rot (LRR) and other causes relative to a nonfertilized control. Each element was applied at a rate of 300 lb/acre on and around 0.2-acre plots replicated seven times in a randomized complete block design. Cumulative mortality from LRR did not differ significantly among fertilizer treatments, and losses were strongly related to density of infected stumps from the previous stand (r2 = 0.74). Mortality from disease and other sources accelerated during the 8 years of monitoring. Average tree growth and stand volume were greatest in treatment N and were reduced where N was combined with K. Continued monitoring is needed to identify potential longer term effects of the fertilizer treatments on susceptibility of Douglas-fir to LRR and Armillaria spp.
Atsiliepimai