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TheScientificWorldJOURNAL (ISSN 1537-744X) |
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Title: |
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Genotypic Effects of Fertilization on Seedling Sweetgum Biomass Allocation, N Uptake, and N Use Efficiency |
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Authors: |
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Chang, Scott X.; Robison, Daniel J. |
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Journal: |
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TheScientificWorldJOURNAL |
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Year: |
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2001 |
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Volume: |
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1 |
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Supplement no.: |
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s2 |
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Page Range: |
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407-414 |
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Article Type: |
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Research Article |
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Handling Editor: |
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Joe Wisniewski |
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Domains: |
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Environmental Management & Policy
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Agronomy
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Soil Systems
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Plant Sciences
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Nutrition
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Cell Signaling
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DOI: |
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10.1100/tsw.2001.275 |
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Synopsis: |
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A pot experiment was conducted to test the effects of N and P application on sweetgum biomass allocation, N uptake, and N use efficiency (NUE) using two half-sib families. N and P application increased seedling biomass by 52 and 16%, respectively. However, improved N nutrition decreased NUE. The two half-sibs have different biomass allocation patterns, N uptake capacity, and NUE under the imposed treatments. |
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Keywords: |
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half-sib, genotype, G x E interaction, fertilization, genetic improvement, shoot, root |
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Abstract |
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Screening and selecting tree genotypes that are responsive to N additions and that have high nutrient use efficiencies can provide better genetic material for short-rotation plantation establishment. A pot experiment was conducted to test the hypotheses that (1) sweetgum (Liquidambar styraciflua L.) families have different patterns in biomass production and allocation, N uptake, and N use efficiency (NUE), because of their differences in growth strategies, and (2) sweetgum families that are more responsive to N additions will also have greater nutrient use efficiencies. Seedlings from two half-sib families (F10022 and F10023) that were known to have contrasting responses to fertility and other stress treatments were used for an experiment with two levels of N (0 vs. 100 kg N/ha equivalent) and two levels of P (0 vs. 50 kg P/ha equivalent) in a split-plot design. Sweetgum seedlings responded to N and P treatments rapidly, with increases in both size and biomass production, and those responses were greater with F10023 than with F10022. Growth response to N application was particularly strong. N and P application increased the proportional allocation of biomass to leaves. Under increased N supply, P application increased foliar N concentration and content, as well as total N uptake by the seedlings. However, NUE was decreased by N addition and was higher in F10023 than in F10022 when P was not limiting. A better understanding of genotype by fertility interactions is important in selecting genotypes for specific site conditions and for optimizing nutrient use in forestry production. |
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