Doses crescentes de corretivo e boro no crescimento, produção de matéria seca, teor de nutrientes e avaliação de incidência da broca das meliáceas no mogno.

Abstract

The objectives of this study was to evaluate the growth, dry matter production,nutrient content and control of Hypsipyla grandella (Zeller) (Lepidoptera: Pyralidae) in seedlings of mahogany (Swietenia macrophylla King, Meliaceae) plants grown in substrate Oxisol under increasing doses of lime and boron. The experimental design was completely randomized, factorial arrangement (|4x4| + 1), with additional treatment (control), four doses of lime (0,5; 1,0; 1,5 and 2, 0 + t.ha -¹ ) and four doses of boron (1, 2, 3 and 4 mg. kg -¹ of substrafe) factors. The characteristics evaluated were height of plant, stem diameter, dry weight of stem, leaves, shoot and root, shoot/root relation; macro (N, P, K, Ca, Mg and S) and micronutrients (B, Cu, Fe, Mn and Zn) in dry matter, length and percentage of the gallery attack of H. grandella. The height of mahogany seedlings was not influenced by doses of lime and boron. The dose of lime to 1,5 t.ha -¹ was the one that was closer than the maximum values estimated by regression equations for the variables of leaves and stem and root/shoot relation. The boron levels adversely affected the root dry matter. For the diameter and weight of stem and root, there was significant interaction between doses of lime and boron. The best results for the growth variables in mahogany seedlings were found at a dose of 1, 5 t.ha -¹ of lime and 1,0 mg.kg -¹ of boron. The two factors evaluated were not statistically significant (p < 0, 5) for the percentage of attack H.grandella on the mahogany seedlings. The interaction between doses of 1,5 t.ha -¹ of lime and 4,0 mg. kg -¹ of boron was the most advantageous in reducing the length of the drill gallery of Meliaceae.