Tree-adapted mechanical flower thinning prevents yield loss caused by over-thinning of trees with low flower set in apple

dc.contributor.authorPenzel, Martin
dc.contributor.authorPflanz, Michael
dc.contributor.authorGebbers, Robin
dc.contributor.authorZude-Sasse, Manuela
dc.date.accessioned2022-05-03T08:46:56Z
dc.date.available2022-05-03T08:46:56Z
dc.date.issued2021
dc.description.abstractFlower thinning compromises the continuous yield and fruit quality in the production of apple fruit. The aim of the present study was to investigate the potential of managing spatial heterogeneity in flower set by adapted tree-individual mechanical flower thinning. In the years 2011, 2014–2016, commercial orchards of ‘Elstar’/M26 and ‘Gala’/M9 trained as slender spindle, with an abundance of varying flower set were mechanically thinned at balloon stage (BBCH 59) with the Darwin 250 device at constant vehicle speed of 8 km h-1 with varying rotational frequency ranging from 200 revolutions per minute (rpm) to 380 rpm. Rotational frequency of the thinning device was translated to average kinetic energy (Ekin [J]) that one string transfers into the canopy. Thinning treatments ranged between 0.15 J and 0.66 J. For low and medium flower sets, majority of trees underrun production target of 119 fruit and, therefore, no thinning was necessary. Treatments >0.23 J caused yield loss by over-thinning without any positive effect on fruit mass. At high flower set, thinning treatments of 0.23 J and 0.33 J were adequate settings to reduce crop load in ‘Elstar’ and 0.33 J in ‘Gala’ without yield loss. The concept of tree adapted flower thinning in comparison to field uniform thinning would result in the avoidance of yield loss by over-thinning of trees with low and medium flower set by 1.4–4.2 t ha-1 in ‘Elstar’ and 2.6–7.6 t ha-1 in ‘Gala’. Results indicate the importance of quantifying flower set for precisely defining the intensity of thinning treatment according to the tree’s yield capacity.en
dc.identifier.eissn1611-4434
dc.identifier.issn1611-4426
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/16792
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-15570
dc.language.isoenen
dc.relation.ispartof10.14279/depositonce-15247
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.ddc580 Pflanzen (Botanik)de
dc.subject.othercrop loaden
dc.subject.otherElstaren
dc.subject.otherfruit qualityen
dc.subject.otherGalaen
dc.subject.otherprecision horticultureen
dc.subject.otheryielden
dc.titleTree-adapted mechanical flower thinning prevents yield loss caused by over-thinning of trees with low flower set in appleen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.17660/eJHS.2021/86.1.10en
dcterms.bibliographicCitation.issue1en
dcterms.bibliographicCitation.journaltitleEuropean Journal of Horticultural Scienceen
dcterms.bibliographicCitation.originalpublishernameInternational Society for Horticultural Scienceen
dcterms.bibliographicCitation.originalpublisherplaceStuttgarten
dcterms.bibliographicCitation.pageend98en
dcterms.bibliographicCitation.pagestart88en
dcterms.bibliographicCitation.volume86en
tub.accessrights.dnbfreeen
tub.affiliationFak. 5 Verkehrs- und Maschinensysteme::Inst. Maschinenkonstruktion und Systemtechnik::FG Agromechatronikde
tub.affiliation.facultyFak. 5 Verkehrs- und Maschinensystemede
tub.affiliation.groupFG Agromechatronikde
tub.affiliation.instituteInst. Maschinenkonstruktion und Systemtechnikde
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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