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
- Institución
- Instituto Nacional de Tecnología Agropecuaria
- OAI Identificador
- oai:localhost:20.500.12123/23952
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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) |
collection |
INTA Digital (INTA) |
instname_str |
Instituto Nacional de Tecnología Agropecuaria |
repository.name.fl_str_mv |
INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuaria |
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tripaldi.nicolas@inta.gob.ar |
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