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Irrigation Criteria and Soil Indicators Quiz

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Irrigation Criteria and Soil Indicators Quiz

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Questions and Answers

What does the acronym ET stand for in the context of the text?

Evapotranspiration (correct)

Evaporation Technique

Effective Tillage

Energy Technology

Which component is NOT part of the equation to calculate evapotranspiration (ET) according to the energy budget method mentioned in the text?

Capillary Rise (CR)

Deep Percolation (DP)

Runoff (RO) (correct)

Irrigation (I)

How is crop evapotranspiration (ETc) calculated in the crop coefficient approach mentioned in the text?

By adding ETc and Kc

By multiplying ETc by Kc (correct)

By dividing ETc by Kc

By subtracting Kc from ETc

What distinguishes the ET of a non-standard crop (Etc adj) from the ET of a standard crop (ETc) as per FAO 56?

Water shortage limitations Signup and view all the answers

Which method involves solving an equation listing all the sources and sinks of thermal energy to determine evaporation as the only unknown?

Energy budget method Signup and view all the answers

What is NOT part of the components mentioned in the soil water balance equation to determine evapotranspiration according to the text?

Precipitation (P) Signup and view all the answers

What does irrigation scheduling involve?

Determining the exact timing and amount of water application to a field. Signup and view all the answers

Why is it important to schedule water rotation among various fields?

To save water and energy by making maximum use of soil moisture storage. Signup and view all the answers

What is the main goal of an irrigator when scheduling irrigation?

Maintaining soil moisture above the critical level to maximize yield. Signup and view all the answers

Which factor is used as an indicator to determine the need for irrigation?

Evapotranspiration rate Signup and view all the answers

How does irrigation scheduling help in reducing fertilizer costs?

By minimizing surface runoff and deep percolation. Signup and view all the answers

What does CWR stand for in the context of determining irrigation water requirement?

Crop Water Requirement Signup and view all the answers

Why is it not advisable to rely solely on plant indicators for determining water stress?

Water stress has usually been withheld too long by the crops when symptoms appear Signup and view all the answers

What does IWR stand for in the context of irrigation strategy?

Irrigation Water Requirement Signup and view all the answers

Why can IWR be equal to CWR for pot plants under good management practices?

Because all applied water to pot plants is totally available for evapotranspiration Signup and view all the answers

What do FC, PWP, and TAW stand for in determining IWR using soil moisture characteristics?

Field Capacity, Permanent Wilting Point, Total Absorbed Water Signup and view all the answers

Why is it important to determine IWR accurately using soil moisture characteristics?

To avoid over-irrigation Signup and view all the answers