Nitrogen levels, top pruning, and lifting date affect nursery development and early field performance of loblolly pine seedlings

  • Authors: Kormanik, Paul P.; Kormanik, Taryn L.; Sung, Shi-Jean S.; Zarnoch, Stanley L
  • Publication Year: 1999
  • Publication Series: General Technical Report (GTR)
  • Source: In: Landis, T.D.; Barnett, J.P., tech coords. National proceedings: forest and conservation nursery associations. GTR-SRS-25. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station: 57-62.

Abstract

Loblolly pine seedling nursery development and 3-year field performance were contrasted between two nitrogen (N) application regimes and comparable top pruning regimes. Other initial soil nutritional elements were comparable, but high N seedlings received 150 lb/acre N (as NH4NO3) and low N seedlings received half this amount. Seedlings were either not top pruned, top pruned in August, or top pruned in August and September. The seedlings were outplanted during 12 equally spaced planting periods from mid-October to mid-March. The high N nursery seedlings were taller and had larger root-collar diameters as compared to the low N seedlings, but the latter survived and grew better after outplanting. Survival was 100 percent for the low N seedlings regardless of pruning treatment but did not reach acceptable levels for the high N seedlings until late December. The low N seedlings were consistently taller after three growing seasons and, depending on planting period, had consistently larger diameter at breast height (early planting periods) or had comparable diameter at breast height (later planting periods) compared to high N seedlings.

  • Citation: Kormanik, Paul P.; Kormanik, Taryn L.; Sung, Shi-Jean S.; Zarnoch, Stanley L 1999. Nitrogen levels, top pruning, and lifting date affect nursery development and early field performance of loblolly pine seedlings. In: Landis, T.D.; Barnett, J.P., tech coords. National proceedings: forest and conservation nursery associations. GTR-SRS-25. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station: 57-62.
  • Keywords: loblolly pine, seedlings, nitrogen, pruning
  • Posted Date: December 11, 2012
  • Modified Date: April 4, 2013
  • Requesting Print Publications

    Publication requests are subject to availability. Fiscal responsibility limits the hardcopies of publications we produce and distribute. Electronic versions of publications may be downloaded, distributed and printed.

    Please make any requests at pubrequest@fs.fed.us.

    Publication Notes

    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
    • Our online publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact the SRS webmaster if you notice any errors which make this publication unusable.
    • To view this article, download the latest version of Adobe Acrobat Reader.