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vol.39 número4TEOR E ACÚMULO DE MACRONUTRIENTES EM FOLHAS DE MARACUJAZEIRO SOB MÉTODOS DE AMOSTRAGEM E ADUBAÇÕES N-KUTILIZAÇÃO DA PRODUTIVIDADE E A RELAÇÃO SÓLIDOS SOLÚVEIS TOTAIS/ACIDEZ TOTAL TITULÁVEL EM LARANJA NA DEFINIÇÃO DO GRUPO-PADRÃO PARA NORMA DRIS índice de autoresíndice de assuntospesquisa de artigos
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Revista Brasileira de Fruticultura

versão impressa ISSN 0100-2945versão On-line ISSN 1806-9967

Resumo

LOPES, PAULO AUGUSTO PEREIRA et al. MICRONUTRIENT CONCENTRATION AND CONTENT IN PASSION FRUIT LEAVES UNDER SAMPLING METHODS AND N-K FERTILIZATION RATES. Rev. Bras. Frutic. [online]. 2017, vol.39, n.4, e-788.  Epub 04-Dez-2017. ISSN 0100-2945.  http://dx.doi.org/10.1590/0100-29452017788.

Balanced uptake of micronutrients by the passion fruit plant is essential for increased production and fruit quality. However, similar fertilizer management in varieties with different productive capacities and high levels of nitrogen and potassium can cause nutritional disorders in plants. The objective of this study was to evaluate leaf micronutrient concentrations and contents in passion fruit as affected by two different sampling methods, different N-K fertilization proportions, and different cultivars. The study was conducted in a randomized block design, with three replications, following a 4 × 6 factorial arrangement consisting of four cultivars of yellow passion fruit (BRS Gigante Amarelo, IAC 275, BRS Ouro Vermelho, and BRS Sol do Cerrado) and six application rates ofN-K2O fertilizer (0-0, 50-125, 100-250, 150-375, 200-500, and 250-625 kg ha-1 year-1). Two leaf sampling methods (leaf located at a position adjacent to the fruit, and leaf located at the end of the fruit-bearing branch) were adopted for nutritional assessment. At 240 days after planting passion fruit seedlings in the experimental area, 20 leaves per plot were sampled. Higher accumulated micronutrient contents were obtained in the adjacent leaves, possibly because of greater leaf weight (more fully developed leaf) compared to the standard leaf. The cultivar IAC 275 had lower concentration and content of Cu, Fe, e Mn in the adjacent leaf, indicating variations in the levels of micronutrients among the cultivars and different micronutrient demands by the cultivars studied. N and K fertilization had less effect on leaf micronutrient concentration and content, but the Zn concentration and content decreased in the standard leaf of the BRS Gigante Amarelo cultivar, and Cu decreased in the standard leaf of the BRS Ouro Vermelho cultivar.

Palavras-chave : Passiflora edulis Sims; Cultivars; Leaf content.

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