Abstract

TUCCI, Carlos Alberto Franco; LIMA, Hedinaldo Narciso  and  LESSA, Josimar Ferreira. Nitrogen fertilization in the production of seedlings of mahogany (Swietenia macrophylla King). Acta Amaz. [online]. 2009, vol.39, n.2, pp. 289-293. ISSN 0044-5967.  http://dx.doi.org/10.1590/S0044-59672009000200007.

Studies on silvicultural aspects of native forest species of the Amazon Rainforest are scarce, mainly those that seek to establish cultivation techniques for production of seedlings. The current work had the objective of evaluating the effects of growing levels of N in the development of mahogany seedlings. The treatments were seven growing doses that were equivalent to the application of: 0; 20; 40; 80; 100 and 120 g N ton^-1 of the substratum. The source of N was urea. The experimental design was randomized blocks with eight repetitions. Evaluations were accomplished after 90 days of transplanting where it was observed answers to the growing doses of N for the diameter of stem, dry matter of the leaves and for total content of N, P, K, Ca and Mg of the leaves. The recommendation of nitrogen fertilization for the production of mahogany seedlings is of 57,5 g N ton^-1 of the substratum as a first approach.

Keywords : Nitrogen; forest species of Amazon Rainforest; mahogany.