Total water requirements (ETm) after transplanting, of a tomato crop grown in the field for 90 to 120 days, are 400 to 600 mm, depending on the climate.
Water requirements related to reference evapotranspiration (ETo) in mm/period are given by the crop factor (Kc) for different crop development stages,
- during the initial stage 0. 4-0. 5 (10 to 15 days),
- the development stage 0. 7-0.8 (20 to 30 days),
- the mid- season stage 1.05-1.25 (30 to 40 days),
- the late-season stage 0.8-0.9 (30 to 40 days) and at harvest 0.6-0.65.