Nitrogen dynamics in field grown comice pears
Tesis para obtener el grado de Doctor of Philosophy (Ph.D.), de la Oregon State University, en mayo de 1990
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| Formato: | info:ar-repo/semantics/tesis doctoral |
| Lenguaje: | Inglés |
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Oregon State University
2020
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| Acceso en línea: | http://hdl.handle.net/20.500.12123/7216 https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9880vt815?locale=en |
| _version_ | 1855035816899772416 |
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| author | Sanchez, Enrique Eduardo |
| author2 | Righetti, Timothy L. |
| author_browse | Righetti, Timothy L. Sanchez, Enrique Eduardo |
| author_facet | Righetti, Timothy L. Sanchez, Enrique Eduardo |
| author_sort | Sanchez, Enrique Eduardo |
| collection | INTA Digital |
| description | Tesis para obtener el grado de Doctor of Philosophy (Ph.D.), de la Oregon State University, en mayo de 1990 |
| format | info:ar-repo/semantics/tesis doctoral |
| id | INTA7216 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| publisher | Oregon State University |
| publisherStr | Oregon State University |
| record_format | dspace |
| spelling | INTA72162021-08-23T17:36:46Z Nitrogen dynamics in field grown comice pears Sanchez, Enrique Eduardo Righetti, Timothy L. Pera Nitrógeno Crecimiento Biomasa Abonos Nitrogenados Pears Nitrogen Growth Biomass Nitrogen Fertilizers Tesis para obtener el grado de Doctor of Philosophy (Ph.D.), de la Oregon State University, en mayo de 1990 The dynamics of N was studied in field grown Comice/Provence quince BA29 pears in Medford, Oregon. Total tree biomass, N content, and ¹⁵N evaluations suggest that young pears require little N (48 kg N ha⁻¹ yr⁻¹). About 45% of total tree N present in dormant trees was remobilized into new growth the following season. Main storage organs were roots, frame and one-year wood. Before leaf fall, peripheral, medium and interior canopy leaves exported to storage tissues 71, 61 and 52% of their total N, respectively. The export of N was influenced more by leaf position in the canopy than the nutritional status of the tree. Shoot and fruit growth were dependent on newly absorbed N. A heavy crop load caused more stored N to be diverted into fruits at the expense of other tree components. Early spring application of N resulted in a buildup of tree reserves for developing buds, but produced excessive growth and resulted in fruits with undesirable high concentration of N. From harvest until leaf fall very little N was partitioned into the aerial portion of the tree. In order to increase sustantially N reserves in the aboveground structure of the tree, and avoid excessive shoot growth and high N fruits, N should be applied 3-6 weeks before harvest. When N was applied at or after harvest but before leaf fall, roots were primarily the site of N storage. At that time 5 or 10% postharvest urea spray was the only effective way to obtain labelled N in flower buds. Early spring growth normally depended on N reserves. However when temperature around bloom was warmer than the long term average newly absorbed N was translocated to the flowers. During the first 3-4 weeks after bloom newly absorbed N was partitioned to spur leaves while shoot leaves were more dependent on stored N. Once spur leaves reached full expansion N was diverted into shoot leaves and fruits. Fruits from the same tree varied considerable in N concentration especially when fertilizer N was applied after bloom. Trees with high N status discriminated in the allocation of N to fruit in different canopy positions but trees with low N status did not. Large number of fruits in any specific location lessened N concentrations. The location of the fruit in the canopy only partially explains N variability. Similar sized fruits only a few centimeters apart may have a two fold concentration range. EEA Alto Valle Fil: Sanchez, Enrique Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Alto Valle; Argentina 2020-05-11T13:43:55Z 2020-05-11T13:43:55Z 1990-05 info:ar-repo/semantics/tesis doctoral info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/7216 https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9880vt815?locale=en 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 Oregon State University |
| spellingShingle | Pera Nitrógeno Crecimiento Biomasa Abonos Nitrogenados Pears Nitrogen Growth Biomass Nitrogen Fertilizers Sanchez, Enrique Eduardo Nitrogen dynamics in field grown comice pears |
| title | Nitrogen dynamics in field grown comice pears |
| title_full | Nitrogen dynamics in field grown comice pears |
| title_fullStr | Nitrogen dynamics in field grown comice pears |
| title_full_unstemmed | Nitrogen dynamics in field grown comice pears |
| title_short | Nitrogen dynamics in field grown comice pears |
| title_sort | nitrogen dynamics in field grown comice pears |
| topic | Pera Nitrógeno Crecimiento Biomasa Abonos Nitrogenados Pears Nitrogen Growth Biomass Nitrogen Fertilizers |
| url | http://hdl.handle.net/20.500.12123/7216 https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9880vt815?locale=en |
| work_keys_str_mv | AT sanchezenriqueeduardo nitrogendynamicsinfieldgrowncomicepears |