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Home → Publications → Forest Nursery Notes → 2007 Summer Forest Nursery Notes → 2007 Summer Forest Nursery Notes - New Nursery Literature → The Response of Bareroot Loblolly Pine Seedlings to the Amount and Timing of Nitrogen Fertilization in the Nursery

The Response of Bareroot Loblolly Pine Seedlings to the Amount and Timing of Nitrogen Fertilization in the Nursery

Williams, H., Woodard, K., and Stewart, T. IN: Proceedings of the 12th biennial southern silvicultural research conference, p. 425-427. USDA Forest Service, Southern Research Station, General Technical Report SRS-71. Kristina F. Connor, ed. 2004.

Abstract- A nursery study was conducted to observe the effects of altering the amount of nitrogen fertilizer at eachapplication on bareroot loblolly pine (Pinus taeda L.) seedling morphology, survival and growth. The treatments were an equalamount of fertilizer applied each time, an increasing amount each time, and a schedule characterized by low amounts, highamounts, and low amounts. Six applications of ammonium nitrate (32.5 percent N) were applied between June and August2000, and for all treatments, a total of 169 kg N per ha was applied. In addition, for each growing season treatment, theseedlings were treated either in October or November with a one-time application of 56 kg N per ha or 113 kg N per ha asammonium nitrate. The seedlings were lifted in January 2001, for morphology measurements and field planting. The seedlingstreated with an increasing amount of N during the growing season had greater foliage, stem and root weights. Seedlingstreated with 113 kg N per ha in October had the largest root collar diameters. First-year survival exceeded 90 percent for alltreatments. First-year height growth was greatest for the seedlings that received 113 kg N per ha in October in the nursery.


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Author(s): Hans Williams, Karen Woodard, Tim Stewart

Section: Fertilization and Nutrition