*3.3. Canola Groundwater Use*

The total canola plant water use and the groundwater contribution for the 12 lysimeters (3 lysimeters from each treatment) are presented in Table 3. Data collected from the water potential sensors were used to calculate soil water content. Initial soil water content was 350 mm in all the lysimeters. Similar to the control treatments, the canola evapotranspiration values in the water table treatments were measured. Each root depth had different ETc values because evapotranspiration was influenced by WTD (Table 3). According to the ETc value comparisons from different WTDs, the 30 cm soil profile had the highest ETc, 717 mm. A significant difference in ETc was observed between the 30 and 90 cm soil profiles. These results showed an inverse relationship between WTD and evapotranspiration. Additionally, the same inverse relationship was obtained between WTD and groundwater contribution. When the water table depth increased from 30 to 90 cm, the amount of water use from the groundwater also increased.


**Table 3.** Total canola water use from the groundwater for different depths.

Note: R denotes replication. The initial condition is assumed to be identical for all lysimeters.
