Özet:

Abstract Pau-de-balsa (Ochroma pyramidale (Cav. Ex Lam.) Urb.) is a pioneer, fast-growing Amazonian tree species with several potential uses. This study aimed to evaluate Ochroma pyramidale seedlings submitted to combinations of nitrogen, phosphorus and potassium (NPK), limestone and agricultural gypsum. The experiment consisted of a completely randomized design, with eight treatments, five replications and four seedlings per repetition, totaling 160 plants. The treatments were: witness; NPK; NPK + limestone; NPK + limestone + agricultural gypsum; N; N + limestone; N + agricultural gypsum and N + limestone + agricultural gypsum. Seedling growth was conducted under greenhouse conditions, using 2.38 dm-3 plastic bags. Seventy days after transplant, plant height (h), root length (CR),  collar diameter (Dc), number (NF) and leaf area (AF), Falker chlorophyll index (ICF), root dry matter (MSR), aerial part (MSPA) and total (MST), plant height/collar diameter ratio (RAD), aerial dry matter/ root dry matter ratio (RPAR), plant height/aerial dry matter (H/MSPA) and Dickson Quality Index were evaluated. Fertilization with NPK, regardless of the presence of limestone and agricultural gypsum, provided greater vegetative growth and pau-de-balsa seedlings quality.

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