What can be used to modify soil reaction?

Specific fertilizers are designed to modify soil reaction, or pH levels, which can significantly impact plant health and nutrient availability. Certain fertilizers contain not only the primary nutrients (nitrogen, phosphorus, potassium) but also elements like sulfur or lime that alter the acidity or alkalinity of the soil. For instance, ammonium-based fertilizers can help lower soil pH, making it more acidic, while lime is commonly used to increase pH and reduce acidity.

Modifying soil reaction is crucial because different plants have specific pH requirements for optimal growth. Therefore, using the right fertilizers can help in creating a conducive environment for particular crops by adjusting the soil's pH to meet their needs.

In contrast, organic matter can improve soil structure and moisture retention, but it does not specifically change pH levels directly. Water is essential for plant growth and can influence soil chemistry over time, but it does not inherently modify soil reaction. Mulch is beneficial for maintaining soil temperature and moisture and preventing weed growth but does not alter the soil's pH.