17 Questions
What does the acronym ET stand for in the context of the text?
Evapotranspiration
Which component is NOT part of the equation to calculate evapotranspiration (ET) according to the energy budget method mentioned in the text?
Runoff (RO)
How is crop evapotranspiration (ETc) calculated in the crop coefficient approach mentioned in the text?
By multiplying ETc by Kc
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
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
What is NOT part of the components mentioned in the soil water balance equation to determine evapotranspiration according to the text?
Precipitation (P)
What does irrigation scheduling involve?
Determining the exact timing and amount of water application to a field.
Why is it important to schedule water rotation among various fields?
To save water and energy by making maximum use of soil moisture storage.
What is the main goal of an irrigator when scheduling irrigation?
Maintaining soil moisture above the critical level to maximize yield.
Which factor is used as an indicator to determine the need for irrigation?
Evapotranspiration rate
How does irrigation scheduling help in reducing fertilizer costs?
By minimizing surface runoff and deep percolation.
What does CWR stand for in the context of determining irrigation water requirement?
Crop Water Requirement
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
What does IWR stand for in the context of irrigation strategy?
Irrigation Water Requirement
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
What do FC, PWP, and TAW stand for in determining IWR using soil moisture characteristics?
Field Capacity, Permanent Wilting Point, Total Absorbed Water
Why is it important to determine IWR accurately using soil moisture characteristics?
To avoid over-irrigation
Test your knowledge on determining how much water to apply based on irrigation criteria and soil indicators, including soil moisture amount, tension, electrical conductivity, and plant indicators like color changes and leaf curling.
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