Foliar application of urea during bloom increases fruit size in 'Williams' pears
Trabajo presentado al X International Pear Symposium, Peniche (Portugal), mayo de 2007
| Main Authors: | , , |
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| Format: | info:ar-repo/semantics/artículo |
| Language: | Inglés |
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ISHS
2025
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| Subjects: | |
| Online Access: | 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 |
| _version_ | 1855038828997246976 |
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| author | Sanchez, Enrique Eduardo Curetti, Mariela Sugar, David |
| author_browse | Curetti, Mariela Sanchez, Enrique Eduardo Sugar, David |
| author_facet | Sanchez, Enrique Eduardo Curetti, Mariela Sugar, David |
| author_sort | Sanchez, Enrique Eduardo |
| collection | INTA Digital |
| description | Trabajo presentado al X International Pear Symposium, Peniche (Portugal), mayo de 2007 |
| format | info:ar-repo/semantics/artículo |
| id | INTA23952 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | ISHS |
| publisherStr | ISHS |
| record_format | dspace |
| spelling | INTA239522025-09-25T14:50:28Z Foliar application of urea during bloom increases fruit size in 'Williams' pears Sanchez, Enrique Eduardo Curetti, Mariela Sugar, David 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 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 2025-09-25T14:46:09Z 2025-09-25T14:46:09Z 2008-10 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 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 eng 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) application/pdf ISHS Acta Horticulturae 800 : 583-586 (2008) |
| spellingShingle | 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 Sanchez, Enrique Eduardo Curetti, Mariela Sugar, David 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 |
| 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_short | 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 |
| 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 |
| 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 |
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