Agricultural soils in The Gambia, West Africa, are highly acidic, which greatly reduces plant growth and ultimately crop yield. The common method of increasing agricultural pH- limestone- is not widely available in The Gambia. However, oyster shells, which have the same property to increase soil pH are widely available, but not currently used. This study looks to investigate the rate of application of oyster shells needed to raise pH to optimal levels for the staple crop groundnut (peanut)