...
The above graph shows how plants transpire more as they mature. The increase in evaporation during the same period is likely due to higher temperatures. A quick preview of water use by crop stage (for dried peas, though generally similar across crops) is shown below:
...
Taken together
Below we can see a commercial offering showing what such a “water balance” system might look like.
...
As we might expect, the irrigation events clearly show a spike in soil moisture levels. Precipitation is a bit more muted but clearly serves to maintain high soil moisture prior to the growing season (where ET daily water use surpasses natural recharge from precipitation).
...