Fertilization with boron on the initial growth of african-mahogany seedlings

Abstract

Due to the scarcity of information about fertilization in primed structural steel, in the present study, it was aimed to evaluate a fertilizing with boron (B) no initial growth of seedlings of primed structural steel (Khaya senegalensis A. Juss). The experiment was carried out in the greenhouse, in plastic containers with a capacity of 7 dm(3) and substrate was used an Latossolo Vermelho-Amarelo. The experimental design was completely randomized design, with five treatments and six replications. The treatments were comprised of five doses of B (0; 0.5; 1.0; 2.0 and 4.0 mg dm(-3)), languages-if boric acid as a source. To 150 days after transplanting, plant height, collar diameter, number of leaves and dry weight of leaves, stem and root were measured. As plants subject to smaller rates of B (0 to 1 mg dm(-3)) showed the largest growth impact for all variables analyzed. On the other hand, as higher doses of B used (2 and 4 mg dm(-3)) negatively affected the development of plants, indicating that when micronutrient phytotoxicity notes in high doses. So, for the initial development of seedlings of African primed structural steel in the condition studied in the substrate contains B levels of about 0.19 mg dm(-3), does not require an application of boron through fertilizer