Response of nursery of angelim-pedra (Dinizia excelsa Ducke) to nitrogen and phosphorus fertilization

Abstract

An experiment in greenhouse conditions was carried out at the Centro de Pesquisa Agroflorestal de Roraima, in 1994, with the objective of studying the effect of N and P levels on growth of nursery plants of angelim-pedra (Dinizia excelsa Ducke). The soil source utilized in the experiment was originated from the layer of 0 to 15 cm of a Dark-Red Podzol located in the county of Cantá (Roraima State). The experimental design was a randomized block in factorial scheme 3 x 6 with three replications. The treatments consisted of the combination of 3 levels of N (0, 50, and 100 kg ha^-1 of N) and 6 levels of P (0, 50, 100, 200, 300, and 400 kg ha^-1 of P₂O₅). Dry matter production of the aerial part, plant height, diameter of the stem and number of leaves per plant, as well as the content of N and P in the plant tissue were determined. Plant growth was significantly affected by phosphorus fertilization, but not by nitrogen fertilization.