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    Author(s): J. O. Dawson; J. W. Van Sambeek
    Date: 1993
    Source: In: Gillespie, Andrew R.; Parker, George R.; Pope, Phillip E.; Rink, George: eds. Proceedings of the 9th Central Hardwood Forest Conference; Gen. Tech. Rep. NC-161. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station: 455-464
    Publication Series: General Technical Report (GTR)
    Station: North Central Research Station
    PDF: View PDF  (2.11 MB)

    Description

    Interplanting black walnut (Juglans nigra) with four different nitrogen fixing, woody nurse crops (Alnus glutinosa, Elaeagnus umbellata, E. angustifolia or Caragana arborescens) increased annual walnut height and stem diameter (dbh) growth overall by as much as 50% and doubled or tripled crown volume compared to all-walnut check plots during a 14-year period after plantation establishment. Walnut interplanted with non-nitrogen fixing, woody nurse crops (Lonicera maackii, Acer ginnala, or Pinus sylvestris) in a companion experiment of 12 years duration did not grow significantly more than walnut in check plots. Experimental plantings were established adjacent to one another in 1978 and 1980 in central Illinois. A split-split plot design divided by replications and sites was employed in both experiments with equal numbers of walnut and the interplanted nurse species intermixed alternately at a 3 x 3-m overall spacing in plots. Walnut trees at a floodplain site had less mortality and significantly greater growth than walnut trees at an upland site. Results indicate that nitrogen fixing nurse crops can be superior to non-nitrogen fixing nurse crops in promoting walnut growth, specifically confirming the possible importance of nitrogen fixation relative to other nurse crop benefits in promoting walnut growth on sites considered good to marginal for black walnut.

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    Citation

    Dawson, J. O.; Van Sambeek, J. W. 1993. Interplanting woody nurse crops promotes differential growth of black walnut saplings. In: Gillespie, Andrew R.; Parker, George R.; Pope, Phillip E.; Rink, George: eds. Proceedings of the 9th Central Hardwood Forest Conference; Gen. Tech. Rep. NC-161. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station: 455-464

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