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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
- a)8.00
- b)7.20
- c)6.80
- d)5.76
Correct answer is option 'D'. Can you explain this answer?
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In a certain month, the reference crop evapotranspiration at a locatio...
Calculation of actual evapotranspiration
Given data:
Reference crop evapotranspiration = 6 mm/day
Crop coefficient = 1.2
Soil coefficient = 0.8
Actual evapotranspiration = Reference crop evapotranspiration x Crop coefficient x Soil coefficient
Substituting the given values, we get:
Actual evapotranspiration = 6 mm/day x 1.2 x 0.8
Actual evapotranspiration = 5.76 mm/day
Therefore, the actual evapotranspiration in mm/day is 5.76.
Explanation
Evapotranspiration is the process of water loss from the soil and plant surfaces due to evaporation and transpiration, respectively. Reference crop evapotranspiration (ET0) is the amount of water that would be lost from a well-watered, uniform grass reference crop under standard conditions. However, actual evapotranspiration (ETa) is the amount of water that is actually lost from a specific crop or land surface.
Crop coefficient (Kc) is a factor that describes the water use efficiency of a particular crop compared to the reference crop. Soil coefficient (Ks) is a factor that describes the water availability and soil moisture status. By multiplying the reference crop evapotranspiration with the crop coefficient and soil coefficient, we can obtain the actual evapotranspiration for a specific crop or land surface.
In this question, the given reference crop evapotranspiration is 6 mm/day, and the crop coefficient and soil coefficient are 1.2 and 0.8, respectively. By substituting these values in the formula for actual evapotranspiration, we get 5.76 mm/day as the answer. Therefore, option D is the correct answer.
Given data:
Reference crop evapotranspiration = 6 mm/day
Crop coefficient = 1.2
Soil coefficient = 0.8
Actual evapotranspiration = Reference crop evapotranspiration x Crop coefficient x Soil coefficient
Substituting the given values, we get:
Actual evapotranspiration = 6 mm/day x 1.2 x 0.8
Actual evapotranspiration = 5.76 mm/day
Therefore, the actual evapotranspiration in mm/day is 5.76.
Explanation
Evapotranspiration is the process of water loss from the soil and plant surfaces due to evaporation and transpiration, respectively. Reference crop evapotranspiration (ET0) is the amount of water that would be lost from a well-watered, uniform grass reference crop under standard conditions. However, actual evapotranspiration (ETa) is the amount of water that is actually lost from a specific crop or land surface.
Crop coefficient (Kc) is a factor that describes the water use efficiency of a particular crop compared to the reference crop. Soil coefficient (Ks) is a factor that describes the water availability and soil moisture status. By multiplying the reference crop evapotranspiration with the crop coefficient and soil coefficient, we can obtain the actual evapotranspiration for a specific crop or land surface.
In this question, the given reference crop evapotranspiration is 6 mm/day, and the crop coefficient and soil coefficient are 1.2 and 0.8, respectively. By substituting these values in the formula for actual evapotranspiration, we get 5.76 mm/day as the answer. Therefore, option D is the correct answer.
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Community Answer
In a certain month, the reference crop evapotranspiration at a locatio...
Given : Et0 = 6 mm/day, Kc = 1.2, Ks = 0.8
We know that based on Basal’s equation of reference evapotranspiration.
Etc = KC·KS Et0
⇒ Etc = 1.2 x 0.8 x 6 = 5.76 mm/day
= 5.76 mm/day
We know that based on Basal’s equation of reference evapotranspiration.
Etc = KC·KS Et0
⇒ Etc = 1.2 x 0.8 x 6 = 5.76 mm/day
= 5.76 mm/day
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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 isa)8.00b)7.20c)6.80d)5.76Correct answer is option 'D'. Can you explain this answer?
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