Some soil moisture sensors will only provide you with raw measurements that then require years of experience to extract useful information from. When choosing a system to help guide your irrigation, always go for a smart one that uses automatic data analysis and machine learning behind the scenes so that you can focus on what's really important: saving time, saving water, and increasing yield.
Some questions to ask:
- Is it obvious from the charts if my field is to wet or too dry?
- How are the sensors calibrated?
- Are the sensors known to produce accurate readings?