Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/7416
Título: Nutritional evaluation of nitrogen and potassium fertilization of carob tree under dry-farming conditions
Autor: Correia, P. J.
Correia, Maribela Pestana
Domingos, I.
Martins Loução, M. A.
Data: 2008
Editora: Taylor & Francis Inc.
Resumo: The aim of this work was to assess how potassium (K) and nitrogen (N) fertilization might affect the variation of leaf and fruit nutrient concentrations in carob tree (Ceratonia siliqua L.) under low precipitation. A field study was conducted in 1997, 1998, and 1999 in a calcareous soil. Four fertilization treatments were tested: no fertilizer (C), 0.8kg N tree(-1) (N treatment), 0.83kg K tree(-1) (K treatment), and 0.80kg N tree(-1) plus 0.83kg K tree(-1) (NK treatment). During the hydrological cycle 1998/1999, only 250mm of rain were recorded. Because of this, from 1998 to 1999 a decrease in the concentrations of mobile nutrients N, phosphorus (P), and K and an increase in calcium (Ca), iron (Fe), and manganese (Mn) were observed in leaves. The application of N led to higher leaf N concentration compared with other treatments. This response allowed the establishment of a linear model that relates soil plant analysis development (SPAD) readings with leaf N concentrations (r(2)=0.55; P < 0.05). Compared with leaves, fruits showed similar amounts of N and P; less Ca, Mg, Fe, and Mn; and high concentrations of K. Fertilization did not change considerably the mineral composition of fruits, and because of large variation among trees, yield was similar for all treatments.
Peer review: yes
URI: http://hdl.handle.net/10400.1/7416
DOI: https://dx.doi.org/10.1080/00103620701879075
ISSN: 0010-3624
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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