This experiment was conducted to study the effects of different phosphorus doses on the growth of Angico-vermelho seedlings (Parapiptadenia rigida). As substratum, Red Yellow Argisol collected from a superficial layer (0-20 cm) was used and as additional fertilizers were added 10 mg/kg of N and 12.5 kg of K, whose sources were (NH4)2SO4 and KCl. The experimental design was completely randomized with 8 treatments and 8 repetitions, totalizing 64 plots, with one plant per plot. The treatments consisted of: control (soil without phosphorus addition), 90, 180, 270, 360, 450, 540 and 630 mg kg of P (utilizing CaHPO4 as salt). The recipients used were polypropylene vases with the capacity of 2.0 dm³. The humidity of the vases was kept at 80% of the field capacity. The following parameters were evaluated after 130 days: height of the aerial part, stem diameter, biomass above ground, root biomass and total biomass. The 450 mg/kg P dose resulted in the best growth of P. rigida plants.
Phosphorus; Parapiptadenia rigida; growth; nutrition
