Nitrogen distribution,remobilization and re-cycling in young orchard of non-bearing ‘Rocha’ pear trees |
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Authors: | Cláudia Neto Corina Carranca Josué Clemente Amarílis de Varennes |
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Institution: | 1. L-INIA, Quinta do Marquês, Avenida da República, 2784-505 Oeiras, Portugal;2. Selectis, Herdade das Praias, Apartado 120, E.C. Bonfim, 2901-877 Setúbal, Portugal;3. Instituto Superior de Agronomia, Technical University of Lisbon, Tapada da Ajuda, 1349-017 Lisboa, Portugal |
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Abstract: | In newly planted orchards, special attention must be paid to fertilization to build up the permanent structure of the trees so that high yield and fruit quality can be reached later on. Nitrogen (N) plays a major role in the fertilization plan, although few studies have assessed its use efficiency in young non-bearing trees, especially in field conditions. In this work, 1–3 years old ‘Rocha’ pear trees, grafted on quince BA29, were planted in a Mediterranean region, and fertigated with 6 g N tree−1 year−1 as ammonium nitrate with 5 at.% 15N enrichment to study the fertilizer N uptake during the vegetative cycle, the overall fertilizer N use efficiency at the end of each year, and the plant–soil N balance for this period. Nitrogen remobilization and the re-cycling of N from senescent leaves were also studied by fertilizing some pear trees with 10 at.% 15N enrichment. |
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Keywords: | Fertigation Fertilizer 15N uptake Fertilizer N use efficiency 15N balance 15N re-cycling Pyrus communis L |
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