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Real-Time ET

Using real-time ET information requires you to:

Access Reference ET information collected in California by the California Dept. of Water Resources' CIMIS program. Pasture grass is the reference crop in California.

Use a crop coefficient to convert Reference crop ET to Crop ET.

Crop ET =
Reference ET x
Crop Coefficient

Crop coefficients are available from CIMIS and some are listed in this table.

For more information on using Real-time ET for irrigation scheduling, see the following:

"Scheduling Irrigations: When and How Much" - ANR Pub. 3396
Weekly Soil Moisture Loss Reports