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Browse yield and nutritive value of two Salix species and Dorycnium rectum in New Zealand

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Abstract

The willows Salix matsudana x alba and S. kinuyanagi, and the leguminous shrub Dorycnium rectum, are used for soil conservation in New Zealand and have potential value as browse plants. Two experiments were conducted in the lower North Island to ascertain the effect of selected establishment and cutting practices on their browse yield and nutritive value. A hill site experiment determined the effect of rooted and unrooted stem cuttings on establishment and initial production of the Salix species. A flat site experiment determined the effect of cutting height (0.10–0.30 m, 0.80 m, and 1.20 m above ground) and cutting frequency (once or twice per year) on yield of the Salix species and D. rectum. The establishment and dry matter (DM) yields of the Salix species were unaffected by the type of stem cutting. S. matsudana x alba (1.2 kg DM/tree) plants yielded more edible DM than S. kinuyanagi (0.9 kg DM/tree) and D. rectum (0.4 kg DM/tree). Cutting height had no effect on edible DM yield but affected total DM yield of the Salix species. Nitrogen concentration in edible DM, of all species, was 18–22 g/kg DM. In vitro organic matter digestibility of S. matsudana x alba (648–691 g/kg DM) and D. rectum (664–666 g/kg DM) was greater than S. kinuyanagi (611–615 g/kg DM). The condensed tannin concentration in edible DM of S. kinuyanagi was four-fold higher than in S. matsudana x alba (255 vs. 59 g/kg DM). It was concluded that S. matsudana x alba had the greatest potential as a browse species and D. rectum the least.

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Authors and Affiliations

  1. Institute of Natural Resources, Massey University, Palmerston North, New Zealand

    S. K. Oppong & P. D. Kemp

  2. AgResearch Grasslands, Private Bag 11008, Palmerston North, New Zealand

    G. B. Douglas

  3. Institute of Renewable Natural Resources, University of Science and Technology, Kumasi, Ghana

    S. K. Oppong & A. G. Foote

Authors
  1. S. K. Oppong
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  2. P. D. Kemp
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  3. G. B. Douglas
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  4. A. G. Foote
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Correspondence to P. D. Kemp.

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Oppong, S.K., Kemp, P.D., Douglas, G.B. et al. Browse yield and nutritive value of two Salix species and Dorycnium rectum in New Zealand. Agroforestry Systems 51, 11–21 (2001). https://doi.org/10.1023/A:1006412021394

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  • DOI: https://doi.org/10.1023/A:1006412021394

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