Winter nitrogen fertilization of loblolly pine seedlings |
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Authors: | Curtis VanderSchaaf Ken McNabb |
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Institution: | (1) Department of Forestry, Virginia Tech University, VA 24061 Blacksburg, Virginia, USA;(2) School of Forestry and Wildlife Sciences, Auburn University, 36849-5418 Auburn, AL, USA |
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Abstract: | Loblolly pine (Pinus taeda L.) seedlings were nitrogen fertilized during winter in a bare root forest tree nursery located in the coastal plain of the southeastern United States. Total application rates were 0, 50, 100, and 200 kg/N/ha applied in split applications 4 weeks apart in January and February. Seedlings were lifted and outplanted in March, 4 weeks after the second fertilization and measured at 3 and 6 months after outplanting. No seedling morphological differences were encountered at the time of lifting and outplanting although seedling shoot nitrogen content was 28% greater in the highest fertilization treatment compared to the check. Shoot nitrogen concentrations fell after outplanting regardless of treatment, decreasing from an average of 1.51% across all treatments at the time of planting to 0.64% at 6 months after planting. When measured at 6 months after outplanting, seedling dry weight and height growth after planting was shown to increase by 12% and 24%, respectively, for the high nitrogen treatment. This and other studies across a variety of sites have found positive post-outplanting seedling growth response after nutrient loading in the nursery. |
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Keywords: | loblolly pine nitrogen fertilization outplanted growth Pinus taeda L winter fertilization |
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