Certified Crop Advisor Practice Exam

What primarily increases soil water storage?

1. Irrigation

2. Crop rotation

3. Precipitation

4. Fertilization

The correct answer is: Precipitation

Precipitation is a key factor in increasing soil water storage, as it is the primary natural source of moisture that replenishes the soil. When rain falls, it can infiltrate the soil and accumulate in the pore spaces, effectively increasing the soil's water-holding capacity. This process also enhances the availability of water to crops, thereby supporting growth and productivity. While irrigation is another method of introducing water to the soil, it relies on existing water sources and infrastructure, and thus is not a natural process. Crop rotation and fertilization contribute positively to soil health and fertility but do not directly increase the amount of water that the soil can store. Fertilization may help improve plant growth and the soil structure over time, which can indirectly influence water retention but does not directly add moisture to the soil like precipitation does. Understanding these dynamics highlights the importance of rainfall patterns and their direct impact on soil moisture levels in agricultural practices.