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dc.contributor.authorTeixeira, E. I.
dc.contributor.authorBrown, H. E.
dc.contributor.authorMeenken, E. D.
dc.contributor.authorMoot, Derrick J.
dc.date.accessioned2012-03-08T01:55:55Z
dc.date.issued2011-06-01
dc.identifier.citationTeixiera, E. I., Brown, H. E., Menkeen, E. D., Moot D. J. (2011). Growth and phenological development patterns differ between seedling and regrowth lucerne crops (Medicago sativa L.). European Journal of Agronomy 35(1), 47-55.
dc.identifier.issn1161-0301en
dc.identifier.urihttps://hdl.handle.net/10182/4324
dc.description.abstractThis study compared physiological responses of fully irrigated seedling and regrowth lucerne crops (Medicago sativa L.) grown under similar environmental field conditions. Measurements occurred for 2-4 years after sowing on 24 October, 15 November, 05 December and 27 December 2000 at Lincoln, Canterbury, New Zealand. Irrespective of the date of sowing, on average lucerne accumulated less shoot dry matter (DM) in the seedling year (11±0.44tha -1 ) than during the regrowth year (18±0.76tha -1 ). Slower shoot-growth rates in seedlings were explained by less intercepted light and reduced efficiency in conversion of light to biomass. Specifically, seedlings had a longer phyllochron (47±2.3°Cd leaf -1 ) and slower leaf area expansion rate (0.009m 2 m -2 °Cd -1 ) than regrowth crops (35±1.8°Cd leaf -1 and 0.016m -2 m -2 °Cd, respectively). There were no differences in canopy architecture with a common extinction coefficient of 0.93. The radiation use efficiency (RUE) for shoot production (RUE shoot ) was 1.2±0.16g DM MJ -1 of intercepted photosynthetically active radiation (PAR i ) in seedlings and 1.9±0.24g DM MJ -1 PAR i in regrowth crops. Reproductive development was slower in seedling than regrowth crops due to an apparent juvenile period ranging from 240 to 530°Cd in seedlings. For both seedling and regrowth phases, the thermal time accumulation to reach 50% buds visible (Tt 0-bv ) and 50% open flowers (Tt 0-fl ) increased as photoperiod shortened in autumn. The minimum Tt 0-bv , or the thermal-time duration of the basic vegetative period (Tt BVP ), was estimated at 270±48°Cd at photoperiods > 14h for regrowth crops. The theoretical threshold below which reproductive development is projected to cease, or the base photoperiod (Pp base ), was estimated at a common 6.9h for seedling and regrowth crops. The transition from buds visible to open flowers (Tt bv-fl ) was mainly controlled by air temperature and ranged from 161°Cd for seedlings to 274°Cd for regrowth crops. These results can be used as guidelines to develop differential management strategies for seedling and r egrowth crops and improve the parameterization of lucerne simulation models. © 2011 Elsevier B.V.en
dc.format.extent47-55en
dc.language.isoen
dc.publisherElsevier
dc.relationThe original publication is available from - Elsevier - https://doi.org/10.1016/j.eja.2011.03.006en
dc.relation.urihttps://doi.org/10.1016/j.eja.2011.03.006en
dc.rightsCopyright © 2011 Elsevier Ltd. All rights reserved.
dc.subjectalfalfaen
dc.subjectleaf area indexen
dc.subjectcrop modellingen
dc.subjectfloweringen
dc.subjectphyllochronen
dc.subjectradiation use efficiencyen
dc.subjectlucerne cropsen
dc.subjectMedicago sativa L.en
dc.subjectAgronomy & Agricultureen
dc.titleGrowth and phenological development patterns differ between seedling and regrowth lucerne crops (Medicago sativa L.)en
dc.typeJournal Article
lu.contributor.unitLincoln University
lu.contributor.unitFaculty of Agriculture and Life Sciences
lu.contributor.unitDepartment of Agricultural Sciences
dc.identifier.doi10.1016/j.eja.2011.03.006en
dc.subject.anzsrc070302 Agronomyen
dc.subject.anzsrc0703 Crop and Pasture Productionen
dc.relation.isPartOfEuropean Journal of Agronomyen
pubs.issue1en
pubs.notesjournal article pre-print depositeden
pubs.organisational-group/LU
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/AGSC
pubs.organisational-group/LU/Research Management Office
pubs.organisational-group/LU/Research Management Office/PE20
pubs.organisational-group/LU/Research Management Office/QE18
pubs.publication-statusPublisheden
pubs.volume35en
lu.identifier.orcid0000-0002-5691-4915


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