Can productivity and post-pruning growth of Jatropha curcas in silvopastoral systems be regulated by manipulating tree spacing/arrangement without changing tree density?

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dc.contributor.author Ghezehei, Solomon Beyene
dc.contributor.author Everson, Colin Stuart
dc.contributor.author Annandale, J.G. (John George), 1959-
dc.date.accessioned 2015-10-01T09:59:45Z
dc.date.issued 2015-03
dc.description.abstract The potential of tree spacing/arrangement to alleviate effects of interspecific competition of hedgerow intercropping systems on productivity and response to pruning of Jatropha curcas (Jatropha) was investigated using a Jatropha e Pennisetum clandestinum (kikuyu) silvopastoral system at Ukulinga (KwaZulu Natal, South Africa). Treatments were differentiated by presence/absence of kikuyu and arrangement/spacing of Jatropha trees (one, two and three tree hedgerows on either side of the alley) and had the same tree density (1110 ha 1). When high water availability and kikuyu dormancy coincided, tree growth rates did not significantly differ across treatments. Trees of the treatment without interspecific competition (tree-only) were the tallest. Even when rainfall was high, post-pruning tree height growth rate was affected by belowground (BG) interspecific competition and tree spacing/arrangement. Treatment with a single tree hedgerow between alleys had the most frequent maximum stem growth rate and was the most efficient during limited water availability. Its trees showed slow initial response to pruning due to a high tree-grass interface, followed by compensatory growth when competition for water with grass was low. Generally, length of tree-grass interfaces affected yield inversely especially as trees matured toward their maximum-yield age (4e5 years). BG competition reduced tree yield more than tree biomass, while tree spacing/arrangement did not affect tree harvest index. Manipulation of tree arrangement/spacing without changing tree density had no consistent effects on tree productivity. en_ZA
dc.description.embargo 2016-03-31
dc.description.librarian hb2015 en_ZA
dc.description.sponsorship Water Research Commission (WRC) and National Research Foundation (NRF) of South Africa for funding the project (K5/1480/1/12). en_ZA
dc.description.uri http://www.elsevier.com/locate/biombioe en_ZA
dc.identifier.citation Ghezehei, SB, Everson, CS & Annandale, JG 2015, 'Can productivity and post-pruning growth of Jatropha curcas in silvopastoral systems be regulated by manipulating tree spacing/arrangement without changing tree density?', Biomass and Bioenergy, vol. 74, pp. 233-243. en_ZA
dc.identifier.issn 0961-9534 (print)
dc.identifier.issn 1873-2909 (online)
dc.identifier.other 10.1016/j.biombioe.2015.01.007
dc.identifier.uri http://hdl.handle.net/2263/50140
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2015 Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Biomass and Bioenergy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Biomass and Bioenergy, vol.74, pp. 233-243, 2015. doi : 10.1016/j.biombioe.2015.01.007. en_ZA
dc.subject Jatropha growth rate en_ZA
dc.subject Interspecific competition en_ZA
dc.subject Post-pruning growth en_ZA
dc.subject Tree-grass interface en_ZA
dc.subject Tree spacing/arrangement effects en_ZA
dc.title Can productivity and post-pruning growth of Jatropha curcas in silvopastoral systems be regulated by manipulating tree spacing/arrangement without changing tree density? en_ZA
dc.type Postprint Article en_ZA


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