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Impact and control of weeds in biomass willow clones

Albertsson, Johannes (2014). Impact and control of weeds in biomass willow clones. Diss. (sammanfattning/summary) Alnarp, Sweden : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2014:63
ISBN 978-91-576-8074-7
eISBN 978-91-576-8075-4
[Doctoral thesis]

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Willow (Salix spp.) grown on arable land as short-rotation coppice (SRC) produces renewable energy in the form of woody biomass. This perennial crop has a high ratio of energy output to input and a good environmental profile. However, weed control is mostly dependent on herbicide use. Therefore, this thesis examined the possibility to further improve the environmental profile of willow SRC by omitting the use of herbicides during establishment. If genetic variation in willow competitiveness to weeds exists, more weed-competitive cultivars might be bred. However, in a study performed at three different sites in southern Sweden, only small differences were found between 12 clones tested for their ability to compete with weeds. Depending on site, weeds reduced stem biomass yield by between 68 and 94% after the first harvest cycle and increased plant mortality at all sites. The practice of cutting the first-year shoots either reduced or did not affect the ability of the willow plants to compete with weeds. Hence, this measure should be omitted provided this is compatible with other management actions. A study on the efficiency and economic returns from four different non-chemical weed control methods during willow establishment of two different cultivars showed that it is possible to establish an agriculturally and economically viable willow plantation without the use of herbicides. The most promising non-chemical weed control method involved repeated passes with a row crop cultivator equipped with torsion weeders, while the least promising method was a living clover cover crop.
Yield data were obtained from the weed competition study for the willow SRC clones when subjected to thorough weeding. Cultivars Sven and Tordis were found to be among the highest yielding at all three sites, although site x clone interactions were found. However, these two clones did not yield significantly more than two more recently bred clones, Klara and Linnea, at any site.
Biomass estimates from destructive and non-destructive methods have been shown to differ and the magnitude of these differences may depend on clone. A study with six different clones showed that assumptions regarding harvest height and dry matter content of clones might explain part of these differences.

Authors/Creators:Albertsson, Johannes
Title:Impact and control of weeds in biomass willow clones
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2014
Number of Pages:54
Paper IAlbertsson, J., Hansson, D., Bertholdsson, N-O. & Åhman I. (2014). Site-related set-back by weeds on the establishment of 12 biomass willow clones. Weed Research, 54(4), 398-407.
Paper IIAlbertsson, J., Verwijst, T., Hansson, D., Bertholdsson, N-O. & Åhman I. (2014). Effects of competition between short-rotation willow and weeds on performance of different clones and associated weed flora during the first harvest cycle. Biomass & Bioenergy, DOI: 10.1016/j.biombioe.2014.08.003
Paper IIIAlbertsson, J., Rosenqvist, H., Verwijst, T., Hansson, D., Bertholdsson, N-O. & Åhman I. Effects of mechanical weed control or cover crop on growth and economic viability of two short-rotation willow cultivars. (Manuscript).
Paper IVVerwijst, T. & Albertsson, J. Assumptions made in protocols for shoot biomass estimation of short-rotation willow clones underlie differences in results between destructive and non-destructive methods. (Manuscript).
Place of Publication:Alnarp, Sweden
Publisher:Dept. of Plant Breeding, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8074-7
ISBN for electronic version:978-91-576-8075-4
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:H Protection of plants and stored products > H60 Weeds and weed control
P Natural resources > P06 Renewable energy resources
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Agrovoc terms:salix, biomass, weeds, weed competition, weed control, clones, yield factors
Keywords:biomass estimations, biomass yield, clones, growth reduction, Salix, weed, weed competition, weed control
Permanent URL:
ID Code:11583
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Plant Breeding (from 130101)
External funders:Energimyndigheten and FORMAS
Deposited By: Mr Johannes Albertsson
Deposited On:08 Oct 2014 09:03
Metadata Last Modified:13 Dec 2014 13:28

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