I am calculating water demand for crops by multiplying A-pan evaporation and crop factors using WR90 data (from water resources of South Africa study) and I get the result in mm. I subtract effective rainfall from from the crop water demand and the deficit is provided by irrigation.
The problem I have is determining the volume required for irrigation. Do I take into account the tree density or this has already been incorporated in the crop factors? In other words, is the irrigation supposed to be calculated simply as Deficit * Field area (assuming 100 % irrigation efficiency)?
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