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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

A positive growth response to NaCl applications in Eucalyptus plantations established on K-deficient soils

Texto completo
Autor(es):
Raposo Almeida, Julio Cesar [1, 2] ; Laclau, Jean-Paul [3, 4] ; de Moraes Goncalves, Jose Leonardo [2] ; Ranger, Jacques [5] ; Saint-Andre, Laurent [4, 5]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Taubate, Taubate - Brazil
[2] USP, ESALQ, Piracicaba - Brazil
[3] Univ Sao Paulo, Dept Ecol, BR-05508900 Sao Paulo - Brazil
[4] CIRAD, UPR Ecosyst Plantat, F-34398 Montpellier - France
[5] INRA, Nancy - France
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: FOREST ECOLOGY AND MANAGEMENT; v. 259, n. 9, SI, p. 1786-1795, APR 15 2010.
Citações Web of Science: 28
Resumo

Contrasting responses of Eucalyptus trees to K fertilizer applications have been reported on soils with low K contents. A complete randomized block experiment was set up in Brazil to test the hypothesis that large atmospheric deposits of NaCl in coastal regions might lead to a partial substitution of K by Na in Eucalyptus physiology and enhance tree growth. Treatments with application of 1.5, 3.0, 4.5 kmol K ha(-1) (K(1.5), K(3.0), 1(4.5, respectively) as KCl, 3.0 kmol K ha(-1) applied as K(2)SO(4), 3.0 kmol Na ha(-1) (Na(3.0)) as NaCl commercialized for cattle feeding, and a mixture of 1.5 kmol K + 1.5 kmol Na ha(-1) (K(1.5) + Na(1.5)) were compared to a control treatment (C) with no K and Na applications. All the plots were fertilized with large amounts of the other nutrients. A positive effect of NaCl applications on the growth of E. grandis trees was observed. NaCl and KCl additions in treatments Na(3.0) and K(3.0) increased above-ground biomass by 56% and 130% three years after planting, respectively, in comparison with the C treatment. By contrast, accumulated litterfall up to age 3 years was not significantly modified. NaCl applications in the Na(3.0) treatment significantly increased Na accumulation in above-ground tree components but did not modify K accumulation, whatever the sampling age. A partial substitution of K by Na in tree physiology, as observed for various agricultural crops, might explain this behaviour. Our results suggest the possibility of applying inexpensive K fertilizers, which are less purified in Na, and explain why high yields are achieved without K fertilizer applications in areas with large dry depositions of marine aerosols. Further investigations are necessary to identify the processes involving Na in Eucalyptus tree physiology. (C) 2009 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 02/11827-9 - Processos de transferência e balanço de água e nutrientes em povoamentos de Eucalyptus que receberam aplicações de nitrogênio e de biossolido:reflexos sobre a sustentabilidade
Beneficiário:José Leonardo de Moraes Gonçalves
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 05/60312-0 - Resposta do Eucalyptus grandis a adubação potássica e a substituição do potássio por sódio
Beneficiário:José Leonardo de Moraes Gonçalves
Linha de fomento: Auxílio à Pesquisa - Regular