Limitações nutricionais em mudas de mogno brasileiro cultivadas no latossolo amarelo de Cruz das Almas - Ba

Abstract

Brazilian mahogany (Switenia macrophylla King) is a species of high commercial value, which is at serious risk of extinction due to excessive exploitation and agricultural expansion. Each species, during its growth and development process, has its own nutritional requirements. Studies of these requirements allow visual symptoms of mineral deficiency occurring in a plantation to be identified and subsequently corrected. The objective of this work was to evaluate the growth and characterize the symptoms of nitrogen, phosphorus, potassium, sulfur, boron, copper, iron, manganese and zinc deficiencies in Brazilian mahogany seedlings. The experimental design used was completely randomized with 11 treatments and four replications, consisting of a complete solution, absolute control, and individual omission of the following nutrients N, P, K, S, B, CU, Fe, Mn, Zn. Visual symptoms of nutritional deficiencies followed the following order P = Zn < Mn < B = N = Fe < K < S < Cu. P deficiency, followed by N, proved to be the most limiting for the development of this species, both macronutrients and micronutrients affected relative growth, the first with Deficiency in the soil and the second causing toxicity, indicating that the amount existing in the soil already it was enough for the mahogany seedlings; and the absolute control treatment was limiting due to the poverty of nutrients in the dystrophic yellow latosol of Cruz das Almas.