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In a certain month, the reference crop evapotranspiration at a location is 6 mm/day. If the crop coefficient and soil coefficient are 1.2 and 0.8, respectively, the actual evapotranspiration in mm/day is

1. 5.76
2. 7.20
3. 6.80
4. 8.00

Correct answer: 5.76

Solution

The actual evapotranspiration can be calculated by multiplying the reference crop evapotranspiration by the crop coefficient and the soil coefficient. In this case, 6 mm/day multiplied by 1.2 (crop coefficient) and 0.8 (soil coefficient) results in 5.76 mm/day.

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