Practice Crop Coefficients And Reference Et (et₀) (20.8) - Measurement of Evapotranspiration

Practice: Crop Coefficients and Reference ET (ET₀)

Lesson 20.8Measurement of Evapotranspiration

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8 questions

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2 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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2 questions · about 1 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What does ET₀ represent?
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Think of the ideal conditions for well-watered grass.
Question 2.
What is a crop coefficient?
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Remember how different crops require different water amounts.
3Question 3.
What does the crop coefficient (Kₐ) represent?
- The evapotranspiration rate from a reference crop
- A factor that adjusts ET₀ for specific crops
- An average temperature value
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Think about how each crop has its own water needs.
4Question 4.
True or False: ET₀ is only relevant for irrigated crops.
- True
- False
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Consider the broader applications of ET₀ in agriculture.
Question 5.
Given a reference ET₀ of 7 mm/day, calculate the total water need for a field of tomatoes with an average Kₐ of 0.8 over 30 days. What would be the total water application?
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You need to multiply the Kₐ, the daily ET₀ rate, and the number of days.
Question 6.
A mixed crop farm has 50% maize, 30% soybeans, and 20% wheat. The respective Kₐ values for these crops are 1.2, 0.7, and 0.9. What would the weighted average Kₐ be for irrigation calculations?
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Combine each Kₐ value multiplied by its respective fraction of the total crop area.

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