RainwaterManaging soil acidity substitutes hydrogen for basic cations such as calcium and magnesium, causing the soil to become acidic. The primary leachingLeaching base that most affects soil pH is calcium. Carbonates combine in low-rainfall conditions to generate caliche. The depth to caliche is determined by leaching depth, which is affected by soil structure, weather patterns, and annual rainfall. Rainfall and sand content both raise the depth to caliche. Erosion and land levelling can expose caliche, and these carbonate-rich layers can cause pH problems. By decreasing the availability of some essential plant nutrients and increasing the availability of harmful elements like manganese, iron, and aluminium in the soil solutionSoil solution, acidic soils cause problems with production. Acidic soils are known for their poor agricultural performance and crop failure, which is largely due to these harmful substances. While different approaches exist, limingLiming is the most commonly recommended management practice for raising low soil pH. For the P and N fertiliser recovery efficiencies necessary for healthy maize development on acidic soils, lime and P fertiliser application are essential. However, using lime and/or fertiliser is not always cost-effective for small-scale farmers and is not environmentally friendly. Although liming alters the topsoil, it does not completely remove the acidity in the subsoil, which poses a major problem for newly sprouting roots. If a soil is too acidic for a certain crop, it might be balanced with lime or dolomite. The amount of lime or dolomite required to balance an acidic pH will depend on the crop and the soil. Soils with high levels of organic matter and clay will need higher rates of application since they are more resilient to pH changes. Generally speaking, a pH of 5.5 is the ideal (in water). After the desired pH of the soil is reached, further lime or dolomite may be required, depending on the crop. Acidic soils can yield crops much more efficiently by raising the pH level to almost neutral. Even though limingLiming is commonly used to reduce soil acidity, studies have shown that adding animal dung supplements can boost the pH of acidic soils.