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Determining the adequate vibration frequency, amplitude and time for the mechanical harvesting of fresh mandarins

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Determining the adequate vibration frequency, amplitude and time for the mechanical harvesting of fresh mandarins

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dc.contributor.author Ortiz Sánchez, María Coral es_ES
dc.contributor.author Torregrosa, A. es_ES
dc.date.accessioned 2017-03-28T07:27:15Z
dc.date.available 2017-03-28T07:27:15Z
dc.date.issued 2013
dc.identifier.issn 0001-2351
dc.identifier.uri http://hdl.handle.net/10251/79133
dc.description.abstract [EN] Mechanical citrus harvesting systems in Spain can solve the problem of the high costs of manual harvesting. Previous results, without the use of abscission agents, have shown the effectiveness of trunk and limb shakers for mechanical citrus harvesting. It is crucial to define the adequate vibration time to achieve an acceptable removal percentage because a higher vibration time could render the operation economically unviable. To address mechanical citrus harvesting, it is also necessary to determine the vibration conditions (amplitude, frequency, and duration) to ensure maximum removal efficiency. The objective of this research is to determine the optimal combination of vibration frequency, amplitude, and duration that will ensure maximum removal efficiency in mechanical citrus harvesting. Marisol and Orogrande mandarin trees were tested and harvested with a commercial trunk shaker. The Marisol trees were shaken at a vibration of 15 Hz for 5 s with a 0.030 m displacement. The Orogrande trees were shaken at 15 and 20 Hz frequencies with two shakes, the first lasting 5 s and the second lasting 2 s, 3 to 4 s after the first shake, with a 0.030 m displacement. Due to the low trunk height of orchard trees in the Valencia region, it is impossible to study intermediate and high amplitudes with a commercial olive trunk shaker. To solve this limitation, a laboratory unidirectional vibratory device was used to shake the branches at a vibration frequency of 4.6 to 18.1 Hz and a vibration amplitude modified from 0.06 to 0.18 m. The field and laboratory results show that the mechanical citrus removal percentage exhibits a logarithmic behavior with time. The laboratory test shows that high-amplitude and intermediate vibration frequencies in the branches achieve adequate removal percentages. Lengthening the shaking time and repeating the shaking process do not increase the removal efficiency. In the field test, almost all the detached fruit fell in the first 2 to 3 s of shaking. It was evident that two shakes were not necessary to obtain an acceptable removal percentage. The results found in the laboratory indicate the possibility of reducing the frequencies and increasing the amplitudes to achieve an optimal mechanical citrus harvest. In the fresh market for citrus from the Mediterranean region, with very low citrus trunk heights, mechanical harvesting equipment can be adapted to achieve high vibration amplitude and intermediate vibration frequencies in the branches. es_ES
dc.description.sponsorship This study was funded by the Ministerio de Ciencia e Innovación (research project RTA2009-00118-C02-02) and FEDER. The authors are most grateful to Agricultural Engineering Pablo Escuin Garin.
dc.language Inglés es_ES
dc.publisher American Society of Agricultural and Biological Engineers es_ES
dc.relation MICINN/RTA 2009-00118-C02-02 es_ES
dc.relation.ispartof Transactions of the ASABE es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Citrus es_ES
dc.subject Mechanical harvest es_ES
dc.subject Trunk Shaker es_ES
dc.subject Vibration duration es_ES
dc.subject.classification INGENIERIA AGROFORESTAL es_ES
dc.title Determining the adequate vibration frequency, amplitude and time for the mechanical harvesting of fresh mandarins es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.13031/2013.42581 es_ES
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural - Escola Tècnica Superior d'Enginyeria Agronòmica i del Medi Natural es_ES
dc.description.bibliographicCitation Ortiz Sánchez, MC.; Torregrosa, A. (2013). Determining the adequate vibration frequency, amplitude and time for the mechanical harvesting of fresh mandarins. Transactions of the ASABE. 56(1):15-22. doi:10.13031/2013.42581 es_ES
dc.description.accrualMethod Senia es_ES
dc.relation.publisherversion http://dx.doi.org/10.13031/2013.42581 es_ES
dc.description.upvformatpinicio 15 es_ES
dc.description.upvformatpfin 22 es_ES
dc.type.version info:eu repo/semantics/publishedVersion es_ES
dc.description.volume 56 es_ES
dc.description.issue 1 es_ES
dc.relation.senia 236604 es_ES
dc.contributor.funder Ministerio de Ciencia e Innovación (MICINN)


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