Acidic soils are an impediment to agricultural production. More than half of the intensively used agricultural land in NSW is affected by soil acidity. This fact sheet includes important information about soil acidity under the following headings: acidic soils in NSW, the impacts of soil acidity, causes of acidification of the soil, how soil acidity reduces crop and pasture production, reducing the impact of soil acidity on agriculture, managing soil acidity with limestone, and estimating rates of soil acidification.