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doubts about Kc (water yield model)


I'm using Invest Water yield model, and is necessary to include data like Kc (The plant evapotranspiration coefficient). I'm searching in the literature, and Kc is variable according to plant phenological cicle. This way, I have several Kc per crop.
Someone, can indicate some considerations about this? I need to use just the last Kc or to do something like Kc average, etc..?

Thanks, so much



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