Eficiência agronômica do Dunito (Silicato de Magnésio) como fonte de magnésio para a cultura do cafeeiro

Abstract

The present work aimed to determine the agronomic efficiency of different doses of dunite, a source of magnesium silicate, as an alternative to magnesium supplementation for coffee cultivation. The experiment was conducted under field conditions in an Arabica coffee plantation, Arara, at IFMG – Campus Bambuí, in a randomized block design, with two independent experiments, five treatments, and four replicates per treatment. The application of the treatments occurred on February 26, 2025. In Experiment 1, a correction area was treated with dolomitic limestone, and doses of 186, 373, 509, and 747 kg ha⁻¹ of dunite were applied, in addition to the trial. In Experiment 2, there were no limestone applications, and doses of 300, 600, 900, and 1,200 kg ha⁻¹ were applied, in addition to the trial. After the year of application, in January 2026, soil and leaf samples were taken to determine soil pH, soil magnesium, and foliar magnesium. The data included in the analysis of variance reached the 5% probability level. In our experiments, no significant effects of the doses on the evaluated variations were observed. In general, the results demonstrate that, under the studied conditions, the treatment did not promote incremental increases in soil and leaf magnesium levels, did not increase response as a result of the applied doses, and did not demonstrate agronomic efficiency during the evaluated period.