Nitrogênio e fósforo no crescimento inicial de mudas de carolina (Adenanthera pavonina Linneaus)

Abstract

The objective of this work was to study doses of nitrogen and phosphorus in the initial growth of the species Adenanthera pavonina Linneaus. The experiment was conducted in an unheated greenhouse, in a 3x5 factorial scheme, consisting of three doses of Nitrogen (0 or control, 50 and 100mg/dm3) and five doses of Phosphorus (0 or control, 150, 300, 450 and 600 mg/dm3), totaling 15 treatments. The design was completely randomized with six replications totaling 90 experimental units, where each one changes after 30 days of sowing in sowing, was produced in a pot with capacity for 1,5 dm3 of soil and the soil used as substrate was the Yellow Latosol Distracted. At 70 days after transplanting, the variables height, diameter, shoot dry mass and root dry mass were evaluated. For the variables stem height and diameter the best response was verified when the seedlings were submitted to the application of 300mg/dm3 of phosphorus and 100mg/dm3 of nitrogen in the soil. The dry matter variable of aerial part presented better development when doses of 50mg/dm3 of nitrogen were used and the presence of phosphorus did not influence the development of this variable. For root dry matter there was only simple effect of the nutrients, being 50mg/dm3 of nitrogen and 300mg/dm3 phosphorus the doses that provided better development of these variables in the seedlings.