Revista de Ciências Agrárias (Jan 2010)

Efeito do controle do sob coberto e da fertilização no cresci­mento e concentração de nutrientes em pinheiro bravo (Pinus pinaster Ait.) Effect of controlling competing vegetation and fertilization on maritime pine (Pinus pinaster Ait.) growth and nutrient concentration

  • R. Xavier,
  • A. L. Pires

Journal volume & issue
Vol. 33, no. 1
pp. 41 – 49

Abstract

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Para determinar o interesse do controle da vegetação do sob coberto e da aplicação de N, P e K no crescimento e concentração de nutrientes em pinheiro bravo (Pinus pinas­ter Ait.) escolheu-se um pinhal com seis anos onde, em Julho de 2002, foram aplica­dos cinco tratamentos: testemunha (T); corte e remoção da vegetação (CR); corte, remo­ção da vegetação e fertilização (CRF); corte e destroçamento da vegetação (CD); corte, destroçamento da vegetação e fertilização (CDF). Entre 2002 e 2007, e em relação a todos os parâmetros dendrométricos considerados, altura, diâmetro, área basal e volume, verifi­cou-se que os acréscimos ocorridos no tra­tamento CDF foram superiores (pTo study the interest of controlling the understory vegetation and the addition of N, P and K on the growth and nutrient concen­tration in maritime pine (Pinus pinaster Ait.), a field trial was established in a 6-year old pine forest. Five treatments were tested: control (T); cutting and removal of compet­ing vegetation (CR); cutting, removal of competing vegetation and fertilization (CRF); cutting and chipping of competing vegetation (CD); cutting, chipping of com­peting vegetation and fertilization (CDF). Between 2002 and 2007, growth in the CDF treatment was higher (p <0.05) than in the other treatments. The lowest growth oc­curred in control and/or in the CR treatment. In general, there were no differences between CD and CRF treatments. Therefore, these re­sults point out that removal of competing vegetation should be considered only if fertil­izers are added (CRF treatment) in order to avoid negative effects on pine growth. Ap­plying fertilizers increased N, P and K con­centrations only in 2002 and 2003, although the increase was not significant.

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