Soil Moisture is measured in Centibars on a scale from 0 to 200
Use the following readings as a general guideline:
0-10 Centibars = Saturated soil
10-30 Centibars = Soil is adequately wet
30-60 Centibars = Usual range for irrigation (most soils)
60-100 Centibars = Usual range for irrigation in heavy clay
100-200 Centibars = Soil is becoming dangerously dry for maximum production.