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I recently attended a class where the statement was made that neutron probes can not be used to measure ET. If this is true I would assume the person would say the same about TDR. I have become certified to use a neutron probe for two reasons, 1) We have one and 2) I thought I might be able to get some studies going to update crop ET numbers. I realize that it would be better to use lysimeters, but.. they are expensive and not readily available and I would guess expensive. It would be great if I could talk DWR into installing its own but not in my lifetime. Someone must have done comparison studies with probes of various types and lysimeters. I ask this group to give your opinions on this subject. I am asking the question regarding measurement of real-time ET not as an irrigation scheduling tool. Thanks in advance, dean ******************************************************** Dean Reynolds Associate Land and Water Use Analyst California Department of Water Resources 3251 S Street Sacramento, Ca. 95816 916-227-7602 916-227-7600 Fax dreynold@water.ca.gov