Which method can be used to measure soil moisture levels?

Using a soil moisture sensor or tensiometer is a reliable method to accurately measure soil moisture levels. These devices provide precise measurements by directly sensing the water content in the soil. Soil moisture sensors work by utilizing electrical resistance or capacitance to determine how much moisture is present, which allows for real-time monitoring of soil water availability. Tensiometers measure soil water tension, helping to assess how tightly water is held in the soil and how much water is available for plant uptake.

This method is particularly useful for farmers and agronomists who need to manage irrigation effectively and ensure proper water management for crops. Understanding soil moisture levels is crucial for optimizing plant growth and maintaining crop health, which makes this method superior compared to others that are less precise or indirect.

The other methods mentioned, such as using a water gauge or measuring temperature changes in the soil, do not provide a direct measurement of soil moisture. Observing plant wilting can indicate moisture stress, but it's a subjective measure that does not quantify soil moisture levels accurately. Thus, utilizing soil moisture sensors or tensiometers is the most effective way to assess moisture levels in the soil.