Monopotassium phosphite is widely used in agriculture as a fungicide and fertilizer. It helps in controlling various plant diseases caused by fungi and oomycetes, such as downy mildew and Phytophthora. The compound enhances plant resistance to pathogens by stimulating the plant's natural defense mechanisms. Additionally, it provides a source of phosphorus and potassium, essential nutrients that promote healthy plant growth and development. Its foliar application is particularly effective in improving crop yield and quality. Monopotassium phosphite is also used in hydroponic systems to ensure optimal nutrient availability for plants. Its ability to improve root development and stress tolerance makes it a valuable input in sustainable farming practices.