How does a whisper sensor work with a drip system?

I have a couple whisper sensors monitoring my lawn and drip system.   I understand how they can monitor the soil in my lawn but I’m wonder how the whisper works on my drip system as it doesn’t see the moisture that’s added to the soil(the emitter isolates the water to the plant) or the rate the plants use it like the one in the lawn does.  I’m assuming it’s just estimating like the Netro would on it’s own.  Is there much value to using a whisper on a drip zone?

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Netro
更新時間 2019-08-26 07:16:59 UTC
The sensor measures the moisture of the soil nearby where it's placed. For lawn, the moisture level is pretty constant everywhere. For drip system, the moisture could vary significantly as the water could be used by plants before reaching far place. So you'd better place your sensor in a typical place, not very far from where water comes out. 
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 2019-08-26 19:57:06 UTC  
The emitters are placed at the base of the plants so there’s no way to get it close without sticking it in the plant which would prevent it from being charged. I could stick an emmiter at the base of the whisper but it wouldn’t use water as a plant would. Is there much benefit with drips then?