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Micronutrientes no sistema solo-Pinus caribaea Morelet em plantios apresentando amarelecimento das acículas e morte de plantas Micronutrients in the soil-Pinus caribaea Morelet System with yellowing of the needles followed by senescence and death

By Roselene de Queiroz Chaves and Gilberto Fernandes Corrêa

Abstract

Com o objetivo de contribuir no diagnóstico de causas que têm levado à morte precoce de pinheiros, verificada após amarelecimento e necrose progressiva das acículas, foi desenvolvido este estudo em áreas de cerrado, no oeste de Minas Gerais. Foram comparadas árvores de Pinus caribaea Morelet das variedades caribaea e hondurensis, plantadas entre 1977-82. Em cada local de amostragem coletou-se material de 20 árvores, sendo 10 com acículas amarelecidas e 10 normais. Foram coletados acículas e tecidos do xilema e floema de raízes, nos quais foram analisados os teores de Fe, Mn, Zn, Cu e B. A classe de solo dos sítios de estudo é Latossolo Amarelo ácrico típico. As amostras foram coletadas nas profundidades: 0-5, 5-10, 10-20, 20-40, 40-60, 60-80, 80-100, 100-150, 150-200, 200-250 e 250-300 cm, nas quais foram analisados os teores trocáveis de Fe, Mn, Zn, Cu e B. Os teores de Fe, Zn, Cu e B não diferiram significativamente entre acículas verdes e amarelecidas, enquanto os teores de Mn foram significativamente inferiores nestas. Observou-se também que os teores de Mn foram maiores no xilema e menores nas acículas das plantas anormais, ocorrendo o inverso nas plantas normais. Os sintomas visuais, confirmados pelos resultados analíticos, revelam haver deficiência de manganês no sistema solo-planta estudado.<br>This study was carried out to diagnose senescence and death of pine trees (Pinus caribaea Morelet), observed after yellowing and progressive necrosis of the needles in the Brazilian Savanna (Cerrado) in Western Minas Gerais, Brazil. The varieties caribaea and hondurensis, planted between 1977 and 1982 were compared. Samples from twenty trees were collected from the three sites studied; ten with yellowing of the needles and ten without symptoms. From each tree, phloem tissue and xylem from root segments and needles were collected and the contents of Fe, Mn, Zn, Cu and B were analyzed. The soil is Yellow Latosol (Typic Acrustox). Soil samples were colleced at the following depths: 0-5, 5-10, 10-20, 20-40, 40-60, 60-80, 80-100, 100-150, 150200, 200-250 and 250-300 cm. Soil analysis was performed to evaluate the contents of Fe, Mn, Zn, Cu and B concentrations. The mean Fe, Zn, Cu and B concentrations did not differ significantly in the green and yellowed needles but the Mn contents were significantly lower in the yellowed needles. Visual symptoms and laboratory test revealed a complex Mn deficiency

Topics: Pinus tropical, relação solo-planta, deficiência nutricional, área de cerrado, reflorestamento, Tropical pine, plant soil relation, nutritional deficiency, Brazilian Savanna (Cerrado), afforestation, LCC:Forestry, LCC:SD1-669.5, LCC:Agriculture, LCC:S, DOAJ:Forestry, DOAJ:Agriculture and Food Sciences
Publisher: Sociedade de Investigações Florestais
Year: 2003
DOI identifier: 10.1590/S0100-67622003000600003
OAI identifier: oai:doaj.org/article:8e03a75bdd48448994970e321e96bad4
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