Steady-state nutrition of hybrid poplar grown from un-rooted cuttings |
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| Authors: | Lisa M Zabek Cindy E Prescott |
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| Institution: | (1) Department of Forest Sciences, Faculty of Forestry, University of British Columbia, 2424 Main Mall, Vancouver, BC, V6T 1Z4 , Canada |
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| Abstract: | Fertilizing plantations of fast-growing tree crops, in manners which supply nutrients at rates that match plant demand and
maintain stable internal plant nutrient ratios, can maximize biomass production and carbon sequestration while reducing fertilizer
wastage and pollution. Our objectives were to determine nutrient ratios of common hybrid poplar (Populus trichocarpa Torr. and Gray × Populus deltoides Marsh.) (T × D) clones under steady-state nutrition, and to determine if incremental additions of fertilizer were more successful
than conventional (evenly-split) fertilizer additions in maximizing biomass production and inducing stable nutrient ratios.
Un-rooted cuttings of three T × D clones (49–177, DTAC-7, 15–29) were grown under a conventional regime and a modified-exponential
fertilization regime at three application rates (1.8, 3.7 or 7.4 g N plant−1). Above- and below-ground biomass and nutrient concentrations were measured after one growing season. There were few differences
in total plant biomass between conventional and modified-exponential fertilization regimes, but for one clone, biomass accumulation
equivalent to the highest rate under the conventional regime was achieved with the medium rate of the modified-exponential
regime. Stable nutrient ratios (at conditions consistent with steady-state nutrition) were: 100N:14P:50K (49–177), 100N:13P:49K
(DTAC-7) and 100N:12P:60K (15–29). |
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| Keywords: | Populus trichocarpa × Populus deltoides Hybrid poplar Steady-state nutrition Nutrient ratios |
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