What does pH buffering capacity refer to?

pH buffering capacity refers to the ability of soil to resist changes in pH when acids or bases are added. This is an important characteristic because soils with high buffering capacity can maintain a more stable pH level, even with the introduction of amendments such as fertilizers or lime. Such stability is crucial for plant health, as many nutrients become more available within a specific pH range. This capacity is influenced by the soil's composition, particularly the clay and organic matter content, which can hold onto hydrogen ions and prevent rapid fluctuations in acidity or alkalinity. Understanding buffering capacity helps farmers manage soil amendments effectively to ensure optimal growing conditions.