Sustainable agricultural practices: Volcanic rock potential for soil remineralization

Brazil is one of the world ' s largest importers of agricultural inputs, with 84% of fertilizers used in the country originating from imports. The widespread use of soluble chemical fertilizers leads to various adverse environmental impacts, such as the eutrophication of water bodies. The development and improvement of techniques and agricultural products capable of providing a variety of macro and micronutrients to crops with the least negative environmental impact have been intensified. Soil remineralization through the addition of ground rocks represents a low-negative environmental impact alternative and clean food production, aligning with the second goal of sustainable development proposed by the United nations agenda 2030. This study aimed to determine the viability of outcropping andesitic in the municipality of Jaguara o, in the extreme south of Brazil, for soil remineralization. For this purpose, mineralogical and geochemical characterization, as well as an analysis of availability of nutrients using citric acid as an extracting solution indicated a significant availability of macronutrients (Ca, K, Mg, and Mn) and micronutrients (Fe and Cu), essential for the development of various crops., were performed. The free quartz content and the levels of K 2 O, MgO, As, Cd, Hg, and Pb comply with the parameters established by Normative Instruction No. 5 of 2016 from the Ministry of Agriculture, Livestock, and Supply (MAPA), which regulates the commercialization of soil remineralizers. The analysis of availability of nutrients using citric acid as an extracting solution indicated a significant availability of macronutrients (Ca, K, Mg, and Mn) and micronutrients (Fe and Cu), essential for the development of various crops.