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Potential Evapotranspiration Formula:
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Potential Evapotranspiration of Crop is the potential evaporation from soils plus transpiration by plants. It represents the maximum amount of water that would be evaporated and transpired if sufficient water were available.
The calculator uses the formula:
Where:
Explanation: The formula applies a 1.2 multiplier to the reference crop evapotranspiration to estimate the potential evapotranspiration for dense natural vegetation.
Details: Accurate evapotranspiration estimation is crucial for irrigation planning, water resource management, agricultural productivity assessment, and climate studies.
Tips: Enter the reference crop evapotranspiration value in meters per second. The value must be greater than zero for accurate calculation.
Q1: What is Reference Crop Evapotranspiration?
A: Reference Crop Evapotranspiration is a hypothetical grass reference crop with an assumed crop height, used as a standard reference for evapotranspiration calculations.
Q2: Why use a 1.2 multiplier for dense vegetation?
A: The 1.2 multiplier accounts for the higher evapotranspiration rates typically observed in dense natural vegetation compared to reference grass crops.
Q3: What are typical ET values for different vegetation types?
A: ET values vary significantly based on vegetation type, climate conditions, and seasonal factors. Dense forests typically have higher ET rates than grasslands or agricultural crops.
Q4: How does temperature affect evapotranspiration?
A: Higher temperatures generally increase evapotranspiration rates as they enhance both evaporation from soil surfaces and transpiration from plants.
Q5: Can this calculator be used for irrigation scheduling?
A: Yes, potential evapotranspiration calculations are fundamental for determining crop water requirements and developing efficient irrigation schedules.