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Acta Amazonica

Print version ISSN 0044-5967

Abstract

MORAES, Larissa Alexandra Cardoso; MORAES, Vicente Haroldo de Figueiredo; MAGALHAES, Francisco Exigidras Leite  and  MOREIRA, Adônis. Fluxes emission of leaves, flowering and nutrient cycling in crown clones of Hevea pauciflora. Acta Amaz. [online]. 2012, vol.42, n.3, pp. 399-404. ISSN 0044-5967.  http://dx.doi.org/10.1590/S0044-59672012000300012.

The leaf phenology has been used as an important characteristic in the selection of Hevea spp. clones, while the nutrient content in litter is a good indicator of nutrient cycling. The objective of this study was to verify the effect of frequency of emission of fluxes of leaves and flowers in crown of Hevea pauciflora, nutritional status and quality of litter. Fifteen plants of ten-year-old of each clones (CNS G 112, CNS G 124 and CBA 2) were evaluated. In tropical Amazonia edaphoclimatic conditions, the leaf emergence and flowering of H. pauciflora occurs with higher intensity in the second semester (beginning of rainy season). The H. pauciflora has higher quantity of litter than the primary forest, and the foliar concentrations of 22.18 g kg-1 of N, 1.47 g kg-1 of P, 5.77 g kg-1 of K, 3.79 g kg-1 de Ca, 2.09 g kg-1 of Mg, 16.15 mg kg-1 of B, 6.14 mg kg-1 of Cu, 53.87 mg kg-1 of Fe, 66.20 mg kg-1 of Mn e 48.44 mg kg-1 of Zn can be utilized as reference for this specie of rubber tree.

Keywords : rubber tree; Amazon; nutritional status; soil litter.

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