12-Year Average Growth
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(3) Sites. stratified by 4 rock types (Basalt, Granite, Metasediment, Glacial Till) and 3 vegetation types (DF, GF, WRC/WH) A core N and K 4-treatment experiment at all sites (control, 300N, 170K, 300N+170K) Additional fertilizer treatments tailored to site conditions (N rates, N-K response surface) Large experimental plots (1/2 a) to monitor mortality.
(4) Amount of N Added (lbs/a) Fertilizer Regime. @ Year 0. @ Year 4. @ Year 8. 0. 0. 0. 100-0-0. 100. 0. 0. 100-0-100. 100. 0. 100. 100-100-100. 100. 100. 100. 200-0-0. 200. 0. 0. 200-0-200. 200. 0. 200. 200-200-200. 200. 200. 200. 300-0-0. 300. 0. 0. 300-0-300. 300. 0. 300. 300-300-300. 300. 300. 300. 0-0-0.
(5) 12-Year Average Growth. Diameter (in) 2.5 2 1.5 1 0.5 0. N Fertilizer Regime.
(6) 12-Year Average Growth. Height (ft) 20 16 12 8 4 0. N Fertilizer Regime.
(7) % Increase Over Control. 60 50. Diameter BA Volume Height. 40 30 20 10 0. N Fertilizer Regime.
(8) 12-Year Gross Growth. 80 70 60 50 40 30 20 10 0. 4000 3500 3000 2500 2000 1500 1000 500 0. N Fertilizer Regime. BA (ft2/a) Volume (ft3/a).
(9) % Increase Over Control. 70 60 50 40 30 20. BA Volume. 10 0 -10. N Fertilizer Regime.
(10) 12-Year % Mortality. % Trees. % BA. % Volume. 9 8 7 6 5 4 3 2 1 0. N Fertilizer Regime.
(11) Growth. effects of single applications were proportional to rate Reapplication at year 8 approximately doubles growth response. Reapplication at 4 year intervals gives inconsistent results Mortality does not appear to be affected by single applications of N fertilizer on these sites. Repeated applications may lead to increased mortality rates.
(12) Growth. and mortality rates showed strong relationships to rate of N application. The effects were proportional to N rate at lower rates but declined at high N rates. N effects varied by series and rock type with rock type differences more pronounced on drier vegetation series. Growth response to N was good on all WRC/WH types. There was no evidence that K applications had an effect on growth rates or modified mortality rates in any consistent fashion across all sites..
(13) Low-K. Sites (8):. • K Concentration < 0.85 % • K/N Ratio < 0.8 High-K. Sites (10):. • K Concentration > 0.9 % • K/N Ratio > 0.85.
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(16) % Volume/a Mortality Multiplier. 2.2 0K. 2 1.8. 85 K (lbs/a). 1.6. 170 K (lbs/a). 1.4. 255 K (lbs/a). 1.2 1 0.8 0.6 0. 200. 400. N Rate (lbs/a). 600.
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(18) % Volume/a Mortality Multiplier. 2.2 0 K (lbs/a). 2 1.8. 85 K (lbs/a). 1.6 170 K (lbs/a). 1.4 255 K (lbs/a). 1.2 1 0.8 0.6 0. 200. 400. N Rate (lbs/a). 600.
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(20) % Volume/a Mortality Multiplier. 3.5 0K. 3 85 K (lbs/a). 2.5. 170 K (lbs/a). 2. 255 K (lbs/a). 1.5 1 0.5 0. 200. 400. N Rate (lbs/a). 600.
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(22) K fertilizer additions did not affect tree growth on either low and high K sites On sites where foliar K is low, mortality rates increase with N application but that increase is lessened when combined with moderate K application. This effect primarily relates to insect and disease mortality. On sites where foliar K is high, N only application does not increase mortality. However, when both high N and high K rates are applied, mortality does increase. Again, this effect primarily relates to insect and disease mortality. .
(23) 12-Year Average Growth. Diameter (in) by Vegetation Type 3 2.5 2 1.5 1 dry wet. 0.5 0. N Fertilizer Regime.
(24) 12-Year Average Growth. BA (ft2) 0.3 0.25 0.2 0.15 0.1 0.05 0. N Fertilizer Regime.
(25) 12-Year Average Growth. Volume (ft3) 14 12 10 8 6 4 2 0. N Fertilizer Regime.
(26) % Increase Over Control. % Trees. % BA. % Volume. 200 150 100 50 0 -50 -100. N Fertilizer Regime.
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(28) % Volume/a Mortality Multiplier. 3.25 0 K (lbs/a). 2.75 85 K (lbs/a). 2.25. 170 K (lbs/a). 1.75. 255 K (lbs/a). 1.25 0.75 0. 200. 400. N Rate (lbs/a). 600.
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