Tree Nitrogen Status and Leaf Canopy Position Influence Postharvest Nitrogen Accumulation and Efflux from Pear Leaves
`Cornice' pear trees (Pyrus communis L.) were fertilized with ammonium nitrate depleted in “N in Spring 1987 and 1988. In Aug., Oct., and Nov. 1988, midleaves on current season shoots were sampled at three positions from the periphery to the center of the canopy. Total N/cm' of leaf area remained al...
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| Format: | info:ar-repo/semantics/artículo |
| Language: | Inglés |
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American Society for Horticultural Science
2020
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| Subjects: | |
| Online Access: | https://journals.ashs.org/jashs/view/journals/jashs/115/6/article-p934.xml http://hdl.handle.net/20.500.12123/7214 https://doi.org/10.21273/JASHS.115.6.934 |
| _version_ | 1855035816536965120 |
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| author | Sanchez, Enrique Eduardo Righetti, Timothy L. |
| author_browse | Righetti, Timothy L. Sanchez, Enrique Eduardo |
| author_facet | Sanchez, Enrique Eduardo Righetti, Timothy L. |
| author_sort | Sanchez, Enrique Eduardo |
| collection | INTA Digital |
| description | `Cornice' pear trees (Pyrus communis L.) were fertilized with ammonium nitrate depleted in “N in Spring 1987 and 1988. In Aug., Oct., and Nov. 1988, midleaves on current season shoots were sampled at three positions from the periphery to the center of the canopy. Total N/cm' of leaf area remained almost constant through October, even though percent N concentration declined as specific leaf weight (SLW) increased. Furthermore, there was no substantial net change in either labeled or unlabeled N in either treatment until senescence began in October. Peripheral leaves contained higher levels of both reserve and newly acquired N than did less-exposed leaves. Despite large differences in N/cm2 for October samples, by November leaves from both high (HN) and low N (LN) trees exported similar percentages of their total N. The average N export to storage tissues irrespective of tree N status was 71%, 61%, and 52% for peripheral, medium, and interior leaves, respectively. The export of N was influenced more by the leaf position in the plant canopy than the nutritional status of the tree. |
| format | info:ar-repo/semantics/artículo |
| id | INTA7214 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| publisher | American Society for Horticultural Science |
| publisherStr | American Society for Horticultural Science |
| record_format | dspace |
| spelling | INTA72142020-05-11T12:32:31Z Tree Nitrogen Status and Leaf Canopy Position Influence Postharvest Nitrogen Accumulation and Efflux from Pear Leaves Sanchez, Enrique Eduardo Righetti, Timothy L. Pera Pyrus communis Nitrógeno Cubierta de Copas Variación Estacional Pears Nitrogen Canopy Seasonal Variation Canopia `Cornice' pear trees (Pyrus communis L.) were fertilized with ammonium nitrate depleted in “N in Spring 1987 and 1988. In Aug., Oct., and Nov. 1988, midleaves on current season shoots were sampled at three positions from the periphery to the center of the canopy. Total N/cm' of leaf area remained almost constant through October, even though percent N concentration declined as specific leaf weight (SLW) increased. Furthermore, there was no substantial net change in either labeled or unlabeled N in either treatment until senescence began in October. Peripheral leaves contained higher levels of both reserve and newly acquired N than did less-exposed leaves. Despite large differences in N/cm2 for October samples, by November leaves from both high (HN) and low N (LN) trees exported similar percentages of their total N. The average N export to storage tissues irrespective of tree N status was 71%, 61%, and 52% for peripheral, medium, and interior leaves, respectively. The export of N was influenced more by the leaf position in the plant canopy than the nutritional status of the tree. EEA Alto Valle Fil: Sanchez, Enrique Eduardo. Oregon State University. Department of Horticulture; Estados Unidos. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Alto Valle; Argentina Fil: Righetti, Timothy L. Oregon State University. Department of Horticulture; Estados Unidos 2020-05-11T12:22:56Z 2020-05-11T12:22:56Z 1990-11 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://journals.ashs.org/jashs/view/journals/jashs/115/6/article-p934.xml http://hdl.handle.net/20.500.12123/7214 0003-1062 2327-9788 https://doi.org/10.21273/JASHS.115.6.934 eng info:eu-repo/semantics/openAccess 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 American Society for Horticultural Science Journal of the American Society for Horticultural Science 115 (6) : 934–937 (November 1990) |
| spellingShingle | Pera Pyrus communis Nitrógeno Cubierta de Copas Variación Estacional Pears Nitrogen Canopy Seasonal Variation Canopia Sanchez, Enrique Eduardo Righetti, Timothy L. Tree Nitrogen Status and Leaf Canopy Position Influence Postharvest Nitrogen Accumulation and Efflux from Pear Leaves |
| title | Tree Nitrogen Status and Leaf Canopy Position Influence Postharvest Nitrogen Accumulation and Efflux from Pear Leaves |
| title_full | Tree Nitrogen Status and Leaf Canopy Position Influence Postharvest Nitrogen Accumulation and Efflux from Pear Leaves |
| title_fullStr | Tree Nitrogen Status and Leaf Canopy Position Influence Postharvest Nitrogen Accumulation and Efflux from Pear Leaves |
| title_full_unstemmed | Tree Nitrogen Status and Leaf Canopy Position Influence Postharvest Nitrogen Accumulation and Efflux from Pear Leaves |
| title_short | Tree Nitrogen Status and Leaf Canopy Position Influence Postharvest Nitrogen Accumulation and Efflux from Pear Leaves |
| title_sort | tree nitrogen status and leaf canopy position influence postharvest nitrogen accumulation and efflux from pear leaves |
| topic | Pera Pyrus communis Nitrógeno Cubierta de Copas Variación Estacional Pears Nitrogen Canopy Seasonal Variation Canopia |
| url | https://journals.ashs.org/jashs/view/journals/jashs/115/6/article-p934.xml http://hdl.handle.net/20.500.12123/7214 https://doi.org/10.21273/JASHS.115.6.934 |
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