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The importance of time of spraying, desiccant type and harvest time on industrial fibre production from stand-retted fibre flax (Linum usitatissimum)

Published online by Cambridge University Press:  23 March 2007

S. J. BENNETT*
Affiliation:
Henfaes Research Centre, School of Agricultural and Forest Sciences, University of Wales Bangor, Abergwyngregyn, Llanfairfechan, Gwynedd LL33 0LB, UK
D. WRIGHT
Affiliation:
School of Agricultural and Forest Sciences, University of Wales Bangor, Deiniol Rd, Bangor, Gwynedd LL57 2UW, UK
G. EDWARDS-JONES
Affiliation:
School of Agricultural and Forest Sciences, University of Wales Bangor, Deiniol Rd, Bangor, Gwynedd LL57 2UW, UK
*
*To whom all correspondence should be addressed. Email: sarita@cyllene.uwa.edu.au

Summary

Even and successful retting of flax through application of a desiccating herbicide and stand-retting is a major constraint to increasing its incorporation in industrial products. With the release of a new form of glyphosate based on the isopropylamine (IPA) salt with biactivator (Roundup Biactive, Monsanto Ltd), a field trial was planted using three flax varieties with differing levels of ease of desiccation at the Henfaes Research Centre, University of Wales Bangor in 2004. The crop was sprayed at four different times of maturity: mid-point of flowering plus 7 days (MPF+7), MPF+14, MPF+21 or MPF+28 using two different herbicide treatments; Roundup Biactive (Monsanto PLC) or Roundup Biactive+Restore (40% ammonium sulphate, AmegA Sciences PLC). Fibre quality was assessed following retting and the ease of decortication was measured. The highest fibre yields were obtained from the MPF+28 spray date, and from the Biactive herbicide treatment. Although lower yields were recorded with the Biactive+Restore treatment, the stems were easier to decorticate. It is suggested that an early sowing date and the use of the IPA salt-based glyphosate with biactivator, and careful monitoring of the crop during the retting process, contributed to the early and successful harvest from the MPF+28 plots, allowing mature seeds as well as fibre to be harvested from the flax plants.

Type
Crops and Soils
Copyright
Copyright © Cambridge University Press 2007

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