20.8 - Crop Coefficients and Reference ET (ET₀)
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Practice Questions
Test your understanding with targeted questions
What does ET₀ represent?
💡 Hint: Think of the ideal conditions for well-watered grass.
What is a crop coefficient?
💡 Hint: Remember how different crops require different water amounts.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does the crop coefficient (Kₐ) represent?
💡 Hint: Think about how each crop has its own water needs.
True or False: ET₀ is only relevant for irrigated crops.
💡 Hint: Consider the broader applications of ET₀ in agriculture.
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Challenge Problems
Push your limits with advanced challenges
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?
💡 Hint: You need to multiply the Kₐ, the daily ET₀ rate, and the number of days.
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?
💡 Hint: Combine each Kₐ value multiplied by its respective fraction of the total crop area.
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