Silicon (Si) plays an important role in plant physiology, especially in improving resistance to various biotic and abiotic stresses. This present study deals with treatment options for silicon-contaminated soils, as well as examining the mechanisms of silicon uptake in plants, potential toxicity, and tolerance mechanisms. Some transporters protein, such as Lsi1 (Low silicon rice 1) and Lsi2 (Low silicon rice 2), facilitate the uptake of Si by plants, which are affected by variables such as soil pH and water availability. Si can reduce absorption problems by reducing the bioavailability and tissue retention of heavy metals such as lead and cadmium. Silicon also increases plant resistance to salt and aluminum stress by improving ionic balance and reducing the utilization of harmful ions. The health benefits and proper management of silica are important because high levels of silica in soil can be harmful. Crop management such as adding straw and soil amendments such as biochar and organic matter can help to control silica levels and reduce risk. This book chapter highlights the important role of Si in sustainable agriculture and provides suggestions for its use to improve soil health and crop production.