Question

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

• A. 5.76
• B. 7.20
• C. 6.80
• D. 8.00

Hint:

To calculate actual evapotranspiration, multiply the reference evapotranspiration by the crop and soil coefficients.

Answer 1

The Correct Option is A

The actual evapotranspiration is calculated using the formula:
\[ ET_{\text{actual}} = ET_{\text{ref}} \times K_c \times K_s, \] where:
- \(ET_{\text{ref}}\) is the reference crop evapotranspiration (6 mm/day),
- \(K_c\) is the crop coefficient (1.2),
- \(K_s\) is the soil coefficient (0.8).
Substituting the values:
\[ ET_{\text{actual}} = 6 \times 1.2 \times 0.8 = 5.76 \, \text{mm/day}. \] Thus, the actual evapotranspiration is 5.76 mm/day.
Thus, the correct answer is:
\[ \boxed{\text{(A) 5.76}}. \]