New Zealand Journal of Agricultural Research abstracts

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Effects of season and frequency of harvest on browse yield and root carbohydrate reserves of willows (Salix spp.) in New Zealand

S. K. Oppong*
P. D. Kemp

Institute of Natural Resources
Massey University
Private Bag 11 222
Palmerston North, New Zealand

G. B. Douglas^†
A. G. Foote

AgResearch Grasslands
Private Bag 11 008
Palmerston North, New Zealand
*Present address: Institute of Renewable Natural Resources, University of Science and Technology, Kumasi, Ghana.
^†Author for correspondence. Email: grant.douglas@agresearch.co.nz

Abstract  Provision of large amounts of browse of willows (Salix spp.) for livestock in dry summers requires the selection of suitable times for coppicing the trees. The effects of time and frequency of harvest on the edible and total dry matter yield and root carbohydrate reserves of Salix matsudana x alba and S. kinuyanagi were measured. Trees were harvested initially in winter (WSpSuA), spring (SpSuA), or summer (SuA), and then at 10-weekly intervals until autumn, except for the winter control (WA) harvested initially in winter and then again in autumn. The greatest cumulative edible and total dry matter (DM) yields were for S. kinuyanagi in the WA treatment. In the WSpSuA and SpSuA treatments, the DM yields of this species were 2- to 4-fold greater than for the SuA treatment. For S. matsudana x alba, yields of the WA, WSpSuA, and SpSuA treatments were similar and exceeded those of the SuA treatment by 4- to 6-fold. Root carbohydrate reserves in S. matsudana x alba comprised more than 90% sucrose and were highest in mid spring. Spring harvesting of Salix trees in coppice blocks will result in reasonable yields of accessible, edible DM for browsing by livestock in summer.

Keywords  coppice; harvesting frequency; harvesting season; regrowth; silvopastoral; Salix matsudana x alba; Salix kinuyanagi; willows

A01004; published 13 June 2002, received 21 February 2001; accepted 14 February 2002
New Zealand Journal of Agricultural Research, 2002, Vol. 45: 87–95
0028–8233/02/4502–0087 $7.00/0 © The Royal Society of New Zealand 2002

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