This chapter examines the agronomic characterization of potassium soil remineralizers and silicate fertilizers under tropical conditions, highlighting the crucial role of potassium (K) as an essential macronutrient for plant growth. K is involved in various physiological processes, including enzyme activation, photosynthesis, osmotic regulation, and stress response, making its availability vital for crop yield and quality. In tropical soils, potassium exists in multiple forms, including soluble, exchangeable, non-exchangeable, and structural potassium. The dynamics of these forms are significantly influenced by soil properties, weathering processes, and microbial activity. The chapter discusses the dissolution of potassium from silicate minerals, such as K-feldspar, biotite, and glauconite, elucidating the factors that affect potassium availability, including particle size, pH, and the presence of organic acids and microorganisms. Potential processing technologies for enhancing K availability from silicate rocks are evaluated, including physical, chemical, and biological methods. Integrating high-temperature pretreatments, solubilizing microorganisms, and organic matter can enhance the effectiveness of silicate-derived potassium fertilizers. Field and greenhouse studies are referenced, highlighting the need to expand long-term studies under field conditions to validate the results found in controlled and short-term conditions. Overall, the efficiency of these products is still low, particularly in the medium to long term, when the natural reserves of nutrients in the soil are depleted. However, adopting a sustainable cultivation system can substantially improve the growing environment for profitable crops.