What role do sensors play in modern irrigation systems?

Sensors play a critical role in modern irrigation systems primarily by detecting soil moisture levels. This capability allows for precise monitoring of water needs, which ensures that plants receive the optimal amount of water without over-irrigation or underwatering. By providing real-time data on the moisture content in the soil, sensors help farmers and gardeners make informed decisions about when to irrigate, leading to more efficient water use and promoting healthy plant growth.

The use of these sensors can significantly contribute to water conservation efforts, especially in regions where water resources are scarce or where sustainable farming practices are a priority. By triggering irrigation systems to operate only when necessary, sensors help minimize waste and reduce costs associated with water usage.

The other options do not accurately reflect the primary function of sensors in irrigation systems. For instance, increasing water pressure is a mechanical function that is unrelated to the role of sensors. Automatically planting seeds involves different machinery and technology that is not connected to moisture detection. Lastly, while measuring plant growth is important, it does not typically fall under the capabilities of sensors used for irrigation, which focus more specifically on soil conditions rather than directly measuring plant development.