*3.2. Canola Irrigation Water Use*

In the control treatment, the water content was kept between the field capacity (0.32 cm3/cm3) and the RAM (0.27 cm3/cm3) in order to prevent water stress and the application of an excessive amount of irrigation water. Three different plant root depths were considered for water requirement calculations. The canola root depth was projected 30 cm between 4 November and 4 December 2018 for the calculation of crop water requirements. Between 4 December 2018 and 4 January 2019, the control plants were irrigated up to a 60 cm root depth. After 4 January 2019, the crop water requirement was calculated for a 90 cm root depth. The volumetric water content for the specified root depths of the control plants was always maintained between field capacity and RAM with supplemental watering (Figure 3).

**Figure 3.** (**a**) Soil moisture content measurements for the control treatment at the desired depth of soil profile and (**b**) irrigation water applied to the lysimeters.

Control lysimeters received 752 mm of cumulative irrigation water. The calculated cumulative canola plant water use varied from 733 to 749 mm, with an average ETc of 740 mm for the control treatments (Table 2).


**Table 2.** Total canola water-use for the control treatments.
