Crescimento de plantas jovens de taxi-branco (Sclerolobium Paniculatum Vogel) em função da idade e da aplicação de fosfato de trauíra.

Abstract

Sclerolobium paniculatum Vogel (lowland white-taxi) is a native specie of the amazon basin with fast growth rate, high biomass production, able to associate with bacteria of the Rhizobium gender and with Mycorrhizal fungi. Its wood properties are compared to those of the wood species used in the south of Brazil as energy source. This research was made to determine the effect of age and different levels of trauira superior rock phosphate on the growth of white-taxi under greenhouse conditions. A randomized block experimental design with a 4 x 5 factorial treatment was used. Treatments were four levels (0, 30, 60 and 90 ppm) of phosphorus and five plant ages (30, 60, 90, 120 c 150 days). Height, number of leaves, leaf area and dry matter production of plants were the variables measured. The results showed a statistically significant effect of age on the variables used. The highest number of leaves averaged 9,59 leaves/plant, at 110, 62 days. Phosphate of trauira increased leaf area and dry matter production of leaves. Highest leaf area was 515,91 cm/plant with application of 52,86 ppm of P and the highest dry matter production of Ieaves was 2,44 g/plant at the level of 44,25 ppm of P.