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Revista Brasileira de Ciência do Solo

On-line version ISSN 1806-9657

Rev. Bras. Ciênc. Solo vol.23 no.3 Viçosa July/Sept. 1999

http://dx.doi.org/10.1590/S0100-06831999000300015 

SEÇÃO IV - FERTILIDADE DO SOLO E NUTRIÇÃO DE PLANTAS

 

Crescimento e absorção de fósforo em plantas de Eucalyptus grandis associadas a fungos micorrízicos em diferentes doses de fósforo e potenciais de água do solo(1)

 

Growth and phosphorus uptake by Eucalyptus grandis seedlings associated to mycorrhizal fungi in different phosphorus rates and soil water potentials

 

 

M. F. FernandesI; H. A. RuizII; J. C. L. NevesIII; R. M. C. MuchovejIV

IPesquisador da Embrapa Tabuleiros Costeiros. CEP 49025-040 Aracaju (SE)
IIProfessor do Departamento de Solos, UFV. CEP 36571-000 Viçosa (MG). Bolsista do CNPq
IIIProfessor do Departamento de Solos, UFV
IVProfessora do Southwest Florida Research and Education Center. Immokalee, FL 34142-9515 (EUA)

 

 


RESUMO

Avaliaram-se a produção de parte aérea (MS), a absorção (CP) e a eficiência de utilização de fósforo (EUP) por plantas de Eucalyptus grandis inoculadas com Glomus etunicatum (Ge) e, ou, Pisolithus tinctorius (Pt), em diferentes combinações entre doses de P e potenciais hídricos do solo (ψ), utilizando-se técnica de raízes subdivididas em vasos geminados, em casa de vegetação. Um dos vasos do conjunto geminado continha os tratamentos em arranjo fatorial de duas doses de P (P60 e P120, correspondentes a adições de 60 e 120 mg dm-3 de solo), três ψ (-10, -40 e -300 kPa) e quatro tratamentos com inóculos fúngicos (não inoculado, Ge, Pt, Ge + Pt). Outro vaso do conjunto continha 4,5 litros de solução nutritiva, sem P. Independentemente da dose de P adicionada, a colonização por Ge foi reduzida com a diminuição do ψ. Quanto à colonização por Pt, observou-se ausência de resposta a ψ em P60 e aumento em P120. A colonização ectomicorrízica foi reduzida quando Pt foi inoculado concomitantemente a Ge. Aumentos do CP, em função do incremento do ψ, foram observados em P60 e P120. No entanto, MS e EUP responderam positivamente à elevação de ψ apenas em P120. A inoculação isolada com Ge não apresentou efeito sobre as plantas, nas combinações entre ψ e P. A colonização por Pt apresentou efeitos diferenciados sobre as plantas, dependendo das condições de ψ e P no solo. Na combinação P60 e -300 kPa, correspondente à situação de menor disponibilidade de P, observou-se efeito deletério da colonização por Pt, isolada ou concomitantemente com Ge, sobre a EUP das plantas. Efeitos positivos da inoculação isolada com Pt sobre o CP foram observados nas combinações entre P120 e ψ de -10 kPa e -40 kPa, embora apenas na segunda situação este maior CP tenha sido acompanhado de incremento da MS.

Termos de indexação: micorriza, fósforo, eucalipto.


SUMMARY

Shoot growth, phosphorus uptake (PC) and utilization efficiency (PUE) of Eucalyptus grandis seedlings associated to Glomus etunicatum (Ge) and, or, Pisolithus tinctorius (Pt), in different P rates and soil water potentials (ψ), were evaluated in a greenhouse experiment with two geminated pots, using a split-root technique. One of the pots in the geminated set contained the treatments, arranged in a factorial scheme of two P rates (P60 and P120, corresponding to additions of 60 and 120 mg dm-3 soil), three ψ (-10, -40 and -300 kPa) and four mycorrhizal inoculation treatments (without inoculation, with Ge, with Pt, and with Ge + Pt). The other pot did not contain P in its nutrient solution. Regardless of the P rate added in soil, colonization decreased in response to ψ reductions. This ψ reduction resulted in no changes on Pt infection in P60, but led to a significant increase in P120. The Pt colonization was lower when it was inoculated with Ge than when inoculated alone. Increases on PC in response to ψ increment were observed in both P rates. However, shoot dry matter (DM) and PUE showed a positive response to ψ increment only at P120. There was no effect of Ge inoculation separately on the plants, in any ψ and P rate combinations. Pt colonization presented distinct effects, depending on these combinations. At P60 and - 300 kPa condition, in which P availability was very low, a deleterious effect of Pt inoculation, separately or associated with Ge, was observed on PUE. Pt inoculation, separately, presented a positive effect on PC in the combinations between P120 and ψ -10kPa or - 40 kPa, but only in the second situation there was a DM increase.

Index terms: mycorrhiza, phosphorus, Eucalyptus.


 

 

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Full text available only in PDF format.

 

 

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Recebido para publicação em outubro de 1998
Aprovado em abril de 1999

 

 

(1) Parte da Tese de Mestrado do primeiro autor apresentada à Universidade Federal de Viçosa - UFV.

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