Foliar application of urea during bloom increases fruit size in 'Williams' pears

Autores
Sanchez, Enrique Eduardo; Curetti, Mariela; Sugar, David
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Trabajo presentado al X International Pear Symposium, Peniche (Portugal), mayo de 2007
In preliminary screening of materials for potential bloom-thinning of ‘Williams’ pears in Oregon, USA and Rio Negro, Argentina, treatment with urea in 5% (w/w) or 7.5% solutions was identified as effective in enhancing fruit size. Other materials tested (ammonium thiosulfate, lime sulfur, fish oil or calcium chloride) caused excessive crop reduction, did not significantly increase fruit size, or caused injury to fruit. Urea treatments at 80% bloom were more effective than treatments at 20% bloom. In Oregon, a 5% urea spray at 80% bloom reduced fruit set in one of three years of trial and increased the proportion of large fruit in the crop (211 grams or larger) in one year. A 7.5% urea spray at 80% bloom increased the proportion of large fruit in the crop in all three years. In Argentina, 5% urea at 80% bloom increased the proportion of large fruit (7 cm or larger) in each of two years as measured by the yield of the first of three successive size-based harvests. In general, a higher concentration of urea (7.5%) resulted in greater yield reduction and a greater increase in fruit size. The results suggest that both crop load reduction and fruit nutrition may be playing roles in the fruit size enhancement observed in this study. Studies are currently underway to identify the distribution of nitrogen from urea applied as a 5% foliar spray at 80% bloom within the fruitlet.
EEA Alto Valle
Fil: Sánchez, Enrique Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Alto Valle; Argentina
Fil: Curetti, Mariela. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Alto Valle; Argentina
Fil: Sugar, David. Oregon State University. Southern Oregon Research and Extension Center; Estados Unidos
Fuente
Acta Horticulturae 800 : 583-586 (2008)
Materia
Fertilizer Application
Foliar Application
Urea
Defruiting
Deblossoming
Pears
Aplicación de Abonos
Aplicación Foliar
Supresión de Frutos
Eliminación de Flores
Pera
Fruit Thinning
Blossom Thinning
Aclareo de Frutos
Aclareo de Flores
Nivel de accesibilidad
acceso restringido
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
INTA Digital (INTA)
Institución
Instituto Nacional de Tecnología Agropecuaria
OAI Identificador
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spelling Foliar application of urea during bloom increases fruit size in 'Williams' pearsSanchez, Enrique EduardoCuretti, MarielaSugar, DavidFertilizer ApplicationFoliar ApplicationUreaDefruitingDeblossomingPearsAplicación de AbonosAplicación FoliarSupresión de FrutosEliminación de FloresPeraFruit ThinningBlossom ThinningAclareo de FrutosAclareo de FloresTrabajo presentado al X International Pear Symposium, Peniche (Portugal), mayo de 2007In preliminary screening of materials for potential bloom-thinning of ‘Williams’ pears in Oregon, USA and Rio Negro, Argentina, treatment with urea in 5% (w/w) or 7.5% solutions was identified as effective in enhancing fruit size. Other materials tested (ammonium thiosulfate, lime sulfur, fish oil or calcium chloride) caused excessive crop reduction, did not significantly increase fruit size, or caused injury to fruit. Urea treatments at 80% bloom were more effective than treatments at 20% bloom. In Oregon, a 5% urea spray at 80% bloom reduced fruit set in one of three years of trial and increased the proportion of large fruit in the crop (211 grams or larger) in one year. A 7.5% urea spray at 80% bloom increased the proportion of large fruit in the crop in all three years. In Argentina, 5% urea at 80% bloom increased the proportion of large fruit (7 cm or larger) in each of two years as measured by the yield of the first of three successive size-based harvests. In general, a higher concentration of urea (7.5%) resulted in greater yield reduction and a greater increase in fruit size. The results suggest that both crop load reduction and fruit nutrition may be playing roles in the fruit size enhancement observed in this study. Studies are currently underway to identify the distribution of nitrogen from urea applied as a 5% foliar spray at 80% bloom within the fruitlet.EEA Alto ValleFil: Sánchez, Enrique Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Alto Valle; ArgentinaFil: Curetti, Mariela. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Alto Valle; ArgentinaFil: Sugar, David. Oregon State University. Southern Oregon Research and Extension Center; Estados UnidosISHS2025-09-25T14:46:09Z2025-09-25T14:46:09Z2008-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12123/23952https://www.actahort.org/books/800/800_77.htm978-90-66056-11-40567-7572 (Print)2406-6168 (Electronic)https://doi.org/10.17660/ActaHortic.2008.800.77Acta Horticulturae 800 : 583-586 (2008)reponame:INTA Digital (INTA)instname:Instituto Nacional de Tecnología Agropecuariaenginfo:eu-repo/semantics/restrictedAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)2025-09-29T13:47:31Zoai:localhost:20.500.12123/23952instacron:INTAInstitucionalhttp://repositorio.inta.gob.ar/Organismo científico-tecnológicoNo correspondehttp://repositorio.inta.gob.ar/oai/requesttripaldi.nicolas@inta.gob.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:l2025-09-29 13:47:32.246INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuariafalse
dc.title.none.fl_str_mv Foliar application of urea during bloom increases fruit size in 'Williams' pears
title Foliar application of urea during bloom increases fruit size in 'Williams' pears
spellingShingle Foliar application of urea during bloom increases fruit size in 'Williams' pears
Sanchez, Enrique Eduardo
Fertilizer Application
Foliar Application
Urea
Defruiting
Deblossoming
Pears
Aplicación de Abonos
Aplicación Foliar
Supresión de Frutos
Eliminación de Flores
Pera
Fruit Thinning
Blossom Thinning
Aclareo de Frutos
Aclareo de Flores
title_short Foliar application of urea during bloom increases fruit size in 'Williams' pears
title_full Foliar application of urea during bloom increases fruit size in 'Williams' pears
title_fullStr Foliar application of urea during bloom increases fruit size in 'Williams' pears
title_full_unstemmed Foliar application of urea during bloom increases fruit size in 'Williams' pears
title_sort Foliar application of urea during bloom increases fruit size in 'Williams' pears
dc.creator.none.fl_str_mv Sanchez, Enrique Eduardo
Curetti, Mariela
Sugar, David
author Sanchez, Enrique Eduardo
author_facet Sanchez, Enrique Eduardo
Curetti, Mariela
Sugar, David
author_role author
author2 Curetti, Mariela
Sugar, David
author2_role author
author
dc.subject.none.fl_str_mv Fertilizer Application
Foliar Application
Urea
Defruiting
Deblossoming
Pears
Aplicación de Abonos
Aplicación Foliar
Supresión de Frutos
Eliminación de Flores
Pera
Fruit Thinning
Blossom Thinning
Aclareo de Frutos
Aclareo de Flores
topic Fertilizer Application
Foliar Application
Urea
Defruiting
Deblossoming
Pears
Aplicación de Abonos
Aplicación Foliar
Supresión de Frutos
Eliminación de Flores
Pera
Fruit Thinning
Blossom Thinning
Aclareo de Frutos
Aclareo de Flores
dc.description.none.fl_txt_mv Trabajo presentado al X International Pear Symposium, Peniche (Portugal), mayo de 2007
In preliminary screening of materials for potential bloom-thinning of ‘Williams’ pears in Oregon, USA and Rio Negro, Argentina, treatment with urea in 5% (w/w) or 7.5% solutions was identified as effective in enhancing fruit size. Other materials tested (ammonium thiosulfate, lime sulfur, fish oil or calcium chloride) caused excessive crop reduction, did not significantly increase fruit size, or caused injury to fruit. Urea treatments at 80% bloom were more effective than treatments at 20% bloom. In Oregon, a 5% urea spray at 80% bloom reduced fruit set in one of three years of trial and increased the proportion of large fruit in the crop (211 grams or larger) in one year. A 7.5% urea spray at 80% bloom increased the proportion of large fruit in the crop in all three years. In Argentina, 5% urea at 80% bloom increased the proportion of large fruit (7 cm or larger) in each of two years as measured by the yield of the first of three successive size-based harvests. In general, a higher concentration of urea (7.5%) resulted in greater yield reduction and a greater increase in fruit size. The results suggest that both crop load reduction and fruit nutrition may be playing roles in the fruit size enhancement observed in this study. Studies are currently underway to identify the distribution of nitrogen from urea applied as a 5% foliar spray at 80% bloom within the fruitlet.
EEA Alto Valle
Fil: Sánchez, Enrique Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Alto Valle; Argentina
Fil: Curetti, Mariela. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Alto Valle; Argentina
Fil: Sugar, David. Oregon State University. Southern Oregon Research and Extension Center; Estados Unidos
description Trabajo presentado al X International Pear Symposium, Peniche (Portugal), mayo de 2007
publishDate 2008
dc.date.none.fl_str_mv 2008-10
2025-09-25T14:46:09Z
2025-09-25T14:46:09Z
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.12123/23952
https://www.actahort.org/books/800/800_77.htm
978-90-66056-11-4
0567-7572 (Print)
2406-6168 (Electronic)
https://doi.org/10.17660/ActaHortic.2008.800.77
url http://hdl.handle.net/20.500.12123/23952
https://www.actahort.org/books/800/800_77.htm
https://doi.org/10.17660/ActaHortic.2008.800.77
identifier_str_mv 978-90-66056-11-4
0567-7572 (Print)
2406-6168 (Electronic)
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/restrictedAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv restrictedAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv ISHS
publisher.none.fl_str_mv ISHS
dc.source.none.fl_str_mv Acta Horticulturae 800 : 583-586 (2008)
reponame:INTA Digital (INTA)
instname:Instituto Nacional de Tecnología Agropecuaria
reponame_str INTA Digital (INTA)
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instname_str Instituto Nacional de Tecnología Agropecuaria
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repository.mail.fl_str_mv tripaldi.nicolas@inta.gob.ar
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