Influence of different phosphorus doses on growth of Peltophoru dubium (Sprengel) Taubert plants.

Abstract

This experiment was conducted with the objective to study the effects of different phosphorus doses in the growth of Canafístula seedlings (Peltophorum dubium). As substratum was used yellow-reddish argisoil, collected on the superficial layer (0-20 cm), which was discloded, homogenized, draught in the air, passed in a sieve of 2 mm and after a analyzed chemically. As complementary fertilization were added 10 mg kg^-1 of N and 12,5 kg^-1 of K, the sources were (NH₄)₂SO₄ and KCl. The experimental design used was completely randomized with 8 treatments and 8 repetitions, totalizing 64 plots. The treatments were constituted by: control (soil without phosphorus addition), 90, 180, 270, 360, 450, 540, 630 mg kg^-1 of P (utilizing CaHPO₄ as salt). As vessels were used polypropylene vases with the capacity of 2,0 dm³. The humidity used in the vases was 80% of the field capacity. After 130days, the following parameters were evaluated: height of the aerial part, stem diameter, biomass above ground, root biomass and total biomass. The dose of 360 mg kg^-1 of P, resulted in a higher growth of Peltophorum dubium plants.