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35
5 . Crop Data Editor
Crop Properties
This is where the available crops and their characteristics are set and is
displayed from the Crop Editor button in the toolbar.
You can populate the table by selecting either the MRGCD ET Database from
the Crop Database drop-down list or by selecting an access source using the
button. Otherwise enter new crop information in the bottom row.
Use Save Changes to Database to store the crop property characteristics so
they can be imported into other projects.
Use Add Crops Used by Demands to populate the table with all the crops
used in the demand nodes.
The crop properties dictate how much water the crop has available (called
RAM or readily available moisture). RAM is a function of root depth,
management allowed depletion, and soil moisture holding capacity. The root
zone for a particular crop will start at the Initial Root Depth when crop
consumption use begins and will extend deeper into the soil to the Max Root
Depth after the Days to Full Cover have elapsed, at which point the root
depth will remain constant until crop consumptive use goes to zero.