Interferência da disponibilidade de luz na resposta à adubação de plantios de enriquecimento com leguminosas arbóreas

Abstract

Resumo -O objetivo deste trabalho foi avaliar a interferência da disponibilidade de luz na resposta à adubação de plantios de enriquecimento da capoeira com leguminosas arbóreas. As espécies Hymenaea courbaril, Stryphnodendron guianense, Parkia platycephala e Stryphnodendron microstachyum foram plantadas em capoeira, sob três tratamentos de fertilização: adubação orgânica, adubação orgânica acrescida de mineral e ausência de adubação. A disponibilidade de luz condicionou a resposta de P. platycephala e H. courbaril à fertilização. A aleatorização não foi suficiente para garantir condições semelhantes de luz nos plantios de enriquecimento. A variação na quantidade de luz incidente no sub-bosque compromete a correta avaliação dos tratamentos de fertilização.Termos para indexação: Hymenaea courbaril, Parkia platycephala, Stryphnodendron guianense, Stryphnodendron microstachyum, capoeira, transmitância. Interference of light availability on response to fertilization of enrichment plantings with leguminous treesAbstract -The objective of this work was to evaluate the interference of light availability on response to fertilization of enrichment plantings of secondary growth forest with leguminous trees. The species Hymenaea courbaril, Stryphnodendron guianense, Parkia platycephala, and Stryphnodendron microstachyum were planted in a secondary growth forest under three fertilization treatments: organic fertilization, organic fertilization plus mineral fertilization, and absence of fertilization. Light availability modulated the response of P. platycephala and H. courbaril to fertilization treatments. Randomization was not sufficient to ensure similar light conditions in the enrichment plantings. Variation in the amount of incident light compromises the sound evaluation of fertilization treatments.

Timber Species Performance in Secondary Forests With Over Used Soils in Eastern Amazonia

“…H. courbaril normally presents low growth rates in the initial years, but with high survivorship. The species had high survival percentages 11 years after planting (SOUZA et al, 2008) and grew rapidly after 15 years under enrichment planting in Central Amazonia, where fertilization was applied (SILVA et al, 2013).…”