Crescimento e teor de macronutrientes em plantas jovens de Paricá cultivadas com resíduos de brita

Abstract

The soil classes used for agricultural purposes in tropical regions typically have low natural fertility, which consequently leads Brazil to assume a significant role as a large importer of fertilizers. The use of regional agrominerals derived from crushed stone or rock dust has emerged as a viable and cost-effective alternative for improving the chemical properties of the soil. Therefore, the objective of this study is to evaluate the growth and content of macro and micronutrients in young paricá plants cultivated in soil fertilized with crushed stone. The experiment was conducted in a greenhouse at the Federal Institute of Amapá, Agricultural Campus of Porto Grande, from September 2023 to August 2024. The experimental design was a randomized block design with five treatments and five replications. The treatments consisted of five doses of crushed stone (0, 16, 24, 32, and 40 g dm-3) and two particle sizes corresponding to 3 mm and 0.15 mm. The experimental units were composed of 8 dm³ pots filled with soil and planted with Schizolobium amazonicum. The parameters assessed included plant height, stem diameter, root length, and physiological parameters such as leaf area and leaf area index. Crushed stone provided greater development in isolation, particularly in stem diameter and leaf dry matter. For height, an interaction was observed where the particle size positively affected growth, especially with the 0.15 mm size. Satisfactory absorption was found for doses of 0.16, 0.24, and 0.32 g dm-3 for most macronutrients, except for phosphorus, which performed better with the 3.0 mm particle size.