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Artículos Científicos

URI permanente para esta colecciónhttp://10.0.96.45:4000/handle/11056/14754

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Examinando Artículos Científicos por Autor "Alvarado, A."

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    Nutrient concentration age dynamics of teak (Tectona grandis L.f.) plantations in Central America
    (Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, 2013-02-04) Fernandez-Moya, J.; Murillo, R.; Portuguez, E.; Fallas, J. L.; Rios, V.; Kottman, F.; Verjans, J. M.; Mata, R.; Alvarado, A.
    Aim of study: Appropriate knowledge regarding teak (Tectona grandis L.f.) nutrition is required for a better management of the plantations to attain high productivity and sustainability. This study aims to answer the following questions: How can it be determined if a teak tree suffers a nutrient deficiency before it shows symptoms? Are nutrient concentration decreases in older trees associated with age-related declines in forest productivity? Area of study: Costa Rica and Panama. Material and methods: Nutrient concentration in different tree tissues (bole, bark, branches and foliage) were measured at different ages using false-time-series in 28 teak plantations. Research highlights: Foliar N concentration decreases from 2.28 in year 1 to 1.76% in year 19. Foliar Mg concentration increases from 0.23 in year 1 to 0.34% in year 19. The foliar concentrations of the other nutrients are assumed to be constant with tree age: 1.33% Ca, 0.88% K, 0.16% P, 0.12% S, 130 mg kg–1 Fe, 43 mg kg–1 Mn, 11 mg kg–1 Cu, 32 mg kg–1 Zn and 20 mg kg–1 B. The nutrient concentration values showed can be taken as a reference to evaluate the nutritional status of similar teak plantations in the region. The concentrations of K, Mg and N could be associated with declines in teak plantation productivity as the plantation becomes older. Whether age-related changes in nutrient concentrations are a cause or a consequence of age-related declines in productivity is an issue for future research with the aim of achieving higher growth rates throughout the rotation period.