CICLAGEM DE NUTRIENTES EM SISTEMA AGROFLORESTAL COM ESPÃCIES FRUTÃFERAS E FLORESTAIS EM RONDÃNIA, BRASIL / Nutrients cycling in agroforestry system with fruitful and forests species in RondÃnia, Brazil.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The agroforestry systems are considered to be the suitable alternatives for occupation of soils in Amazonian area, due to countless advantages for maintenance or improvement of the productive capacity of the soils. The objective of this work was to evaluate some components of the nutrients of cycling in different fruitful coverings and forest components of a multistrata agroforestry system located in the Experimental Station Ouro Preto, property of the Executive Commission of Agriculture Cocoaâs Plan (CEPLAC), in the municipal district of Ouro Preto do Oeste (RO), Brazil. The studied species were: hose tree (Mangifera indica), breadfruit (Artocarpus altilis), cupuaÃu tree (Theobroma grandiflorum), avocado tree (Persea americana), shaded cocoa tree (Theobroma cacao L.) with gliricÃdia (Gliricidia sepium) and the forest species were bandarra (Schizolobium amazonicum) and teak (Tectona grandis). As reference an 8-year-old natural vegetation area was used. The annual litter production from October, 2002 to September, 2003, was 13,38 t ha-1 for natural vegetation, 4,02 t ha-1 for bandarra, 3,43 t ha-1 for gliricÃdia, 2,86 t ha-1 for avocado, 2,54 t ha-1 for breadfruit, 1,40 t ha-1 for cupuaÃu tree, 1,16 t ha-1 for the cocoa, 1,12 t ha-1 for hose tree and 1,07 t ha-1 for teak. The natural vegetation, bandarra and cocoa tree presented a higher deposition in dry period (summer), while breadfruit, hose tree, teak and avocado tree, presented the highest deposition in the wet period (winter). In general, the transfer of nutrients through the litter deposition was higher in the natural vegetation, and among the species of the agroforestry system, bandarra and gliricÃdia returned the highest amounts of N, while cocoa tree, bandarra, breadfruit, the avocado tree and the teak returned the highest largest amounts of P. Teak presented larger efficiency in the use of nutrients (relationship biomass / nutrients) for N, Mg e S, while cupuaÃu tree was more efficient for P and K use. The accumulated litter on the soil was 14,6 t.ha-1in hose, 12,8 t.ha-1 in bandarra, 12,73 t ha-1 in the natural vegetation, 12,0 t ha-1 in avocado, 9,87 t ha-1 in the shaded cocoa with gliricÃdia, 9,88 t ha-1 in cupuaÃu tree, 9,0 t ha-1 in breadfruit and 7,39 t ha-1 in teak. The litter accumulated in the soil by hose tree and avocado tree was richer in nutrients. On the other hand, the decomposition of the litter was faster in the treatments, natural vegetation, cocoa tree / gliricÃdia and bandarra. The nutrients stocks in the soils under different fruitful and forest species, followed in general, the sequence N>Ca>Mg>K>S>P.

ASSUNTO(S)

nutrients,forests,fruitful espÃcies,floretais,agroflorestal fitotecnia

ACESSO AO ARTIGO

Documentos Relacionados