Avaliação do estado nutricional de plantios de mogno em diferentes idades no Semiárido Cearense.

Abstract

There are still few studies related to the species of the Khaya genus mainly regarding the evaluation of their nutritional status in the planting phase. In this context, the objective of this work was to evaluate the nutritional status of Africanmahogany (mognoafricano) plants located in the Várzea Alegre CE, through the analysis of the macronutrients present in the plant and soil. The experiment was developed at Jaburu Farm, located in Várzea AlegreCE. The experiment was conducted under field conditions, with a completely randomized design, in which four treatments were used: T1 Khaya ivorensis A. Chev. with 1.4 years of age, T2 Khaya senegalensis A. Juss. with 2.4 years of age, T3 Khaya senegalensis A. Juss. with 5.4 years of age and T4 Khaya ivorensis A. Chev. with 5.4 years of age, and five replicates for each treatment. To evaluate the nutritional status, soil physicochemical attributes and foliar tissues were determined for quantification of macronutrient contents. The data were submitted to analysis of variance and the means were compared by the Tukey test at the significance level of 5% of probability. The macronutrient contents are within or above the ideal range when compared to the results found in other forest species. The species Khaya ivorensis presented superior results for P, Ca, Mg, and S indicating a higher requirement of the species for these nutrients. In relation to Khaya senegalensis, it presented higher content for N and K. The highest levels of K were found in the younger plantations, tending to decrease in the older plantations due to their mobility in the plant. The reduction of macronutrient contents in mahogany leaves was observed in the following order: Khaya ivorensis (1.4 years of age) Ca> N> S> K> Mg> P, Khaya senegalensis (2.4 years of age) Ca> N> K > S> Mg> P, Khaya senegalensis (5.4 years of age) Ca> N> K> S> Mg> P, Khaya ivorensis (5.4 years) Ca> N> K> S> Mg> P.