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Van Sambeek, J. W., & Garrett, H. E. (2004). Ground Cover Management in Walnut and Other Hardwood Plantings. In C. H. Michler, P. M. Pijut, J. W. Van Sambeek, M. V. Coggeshall, J. Siefert et al. (Eds.), Black Walnut in a New Century. General Technical Report NC-243 (pp. 85-100). St. Paul, MN: North Central Research Station, USDA Forest Service.
http://www.treesearch.fs.fed.us/pubs/14714

has been cited by the following article:

• TITLE: Field Performance of Quercus bicolor Established as Repeatedly Air-Root-Pruned Container and Bareroot Planting Stock

  AUTHORS: J. W. Van Sambeek, Larry D. Godsey, William D. Walter, Harold E. Garrett, John P. Dwyer

  KEYWORDS: Afforestation, Root Fibrosity, Root Production Method, Seedling Quality, Swamp White Oak, Whole-Tree Biomass

  JOURNAL NAME: Open Journal of Forestry, Vol.6 No.3, June 2, 2016

  ABSTRACT: Benefits of repeated air-root-pruning of seedlings when stepping up to progressively larger containers include excellent lateral root distribution immediately below the root collar and an exceptionally fibrous root ball. To evaluate long-term field performance of repeatedly air-root-pruned container stock, three plantings of swamp white oak (Quercus bicolor Willd.) 10 to 13 years old were located that also included bareroot planting stock. Initial and final stem diameter and height and above-ground green weights were determined on randomly selected trees at each site. On a site with a sandy, excessively drained, high pH soil, trees (age 10) from container stock were 1.5 times taller, 2.3 times larger in dbh, and 2.8 times greater in green weight than trees from bareroot stock which averaged only 2.9 m tall, 3.9 cm dbh, and 16.3 kg green weight. On a site with high clay, poor internal drainage, and frequent flooding, trees (age 12) from container stock were 1.4 times taller, 1.8 times larger in dbh, and 4.1 times greater in green weight than trees from bareroot stock which averaged 4 m tall, 7.3 cm dbh, and 28 kg green weight. On an upland site with deep loess soils, there was a trend for trees (age 13) from container stock to be only slightly larger than trees from bareroot stock with each stock type averaging 9.6 m tall, 20 cm dbh, and 177 kg green weight. Repeated air-root pruning produced lateral roots immediately below the root collar that resulted in large container stock with large well-balanced root systems that were competitive on harsh or less than ideal oak sites. Although the process is relatively labor intensive, propagation of repeatedly air-root-pruned container stock is readily adaptable internationally to locally available sources of organic matter and open-bottom containers.