Recovery dynamics of rainfed winter wheat after livestock grazing 2. Light interception, radiation-use efficiency and dry-matter partitioning

dc.contributor.authorHarrison, Matthew
dc.contributor.authorEvans, John
dc.contributor.authorDove, Hugh
dc.contributor.authorMoore, Andrew D
dc.date.accessioned2015-12-10T22:20:23Z
dc.date.issued2011
dc.date.updated2016-02-24T11:27:27Z
dc.description.abstractGrazing of cereal crops reduces canopy light interception and could potentially reduce biomass production and grain yields. Alternatively, defoliation after canopy closure may increase light penetration and enhance radiation-use efficiency (RUE, shoot dry matter produced per unit light intercepted). Changes in dry matter partitioning following grazing may also ameliorate grain yield penalties. Experiments with rainfed winter wheat were conducted near Canberra, Australia, to investigate the effect of different intensity or duration of grazing on two cultivars. Grazing reduced leaf area index (LAI), light interception and growth rates by up to 90% but did not affect overall RUE. Although grazing caused significant reductions in cumulative light interception and total dry matter accumulation, it did not affect grain yields because grazed crops had delayed phenological development, allowing increased partitioning of shoot dry matter to spikes. Grazing reduced stem dry matter accumulation and consequently decreased the amount of stem assimilate available for retranslocation to kernels by up to 75%. However, by delaying crop ontogeny, grazing prolonged green area duration after anthesis and thereby increased the supply of assimilates from current photosynthesis to developing kernels, mitigating potential yield penalties caused by defoliation.
dc.identifier.issn1836-0947
dc.identifier.urihttp://hdl.handle.net/1885/51896
dc.publisherCSIRO Publishing
dc.sourceCrop and Pasture Science
dc.subjectKeywords: allometry; crop yield; defoliation; dry matter; grazing management; herbivory; leaf area index; light effect; light use efficiency; phenology; physiology; rainfed agriculture; translocation; wheat; Australia; Australian Capital Territory; Canberra; Tritic allometry; assimilate; defoliation; herbivory; kernels; phenology; physiology; retranslocation; Triticum aestivum.
dc.titleRecovery dynamics of rainfed winter wheat after livestock grazing 2. Light interception, radiation-use efficiency and dry-matter partitioning
dc.typeJournal article
local.bibliographicCitation.issue11
local.bibliographicCitation.lastpage971
local.bibliographicCitation.startpage960
local.contributor.affiliationHarrison, Matthew, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationEvans, John, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationDove, Hugh, CSIRO Division of Plant Industry
local.contributor.affiliationMoore, Andrew D, CSIRO Plant Industry
local.contributor.authoremailu8802050@anu.edu.au
local.contributor.authoruidHarrison, Matthew, u4203194
local.contributor.authoruidEvans, John, u8802050
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor070303 - Crop and Pasture Biochemistry and Physiology
local.identifier.absseo820507 - Wheat
local.identifier.ariespublicationu4956746xPUB234
local.identifier.citationvolume62
local.identifier.doi10.1071/CP11235
local.identifier.scopusID2-s2.0-84555202725
local.identifier.thomsonID000298331700004
local.identifier.uidSubmittedByu4956746
local.type.statusPublished Version

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