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We have soil sensors buried in the ground at the levels indicated below.
Each level has a temperature probe and a moisture sensor.
|Moisture - cb||Temperature - °C|
|10||1000 cb||-100 cb||255 cb||212°C||-148°C||212°C|
|30||1000 cb||-100 cb||255 cb||491°C||-148°C||212°C|
Water potential is commonly measured in units of bars (and centibars in the English system of measurement) or kilopascals (in metric units).
One bar is approximately equal to one atmosphere (14.7 lb/in 2 ) of pressure. One centibar is equal to one kilopascal.
|Saturated Soil. Occurs for a day or two after irrigation.|
|Soil is adequately wet (except coarse sands which are drying out at this range)|
|Usual range to irrigate or water (except heavy clay soils).
Irrigate at the upper end of this range in cool humid climates and with higher water-holding capacity soils.
|Usual range to irrigate heavy clay soils|
|Soil is becoming dangerously dry for maximum production.|
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