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Blaney Criddle Equation:
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The Blaney Criddle equation estimates potential evapotranspiration in crop season, which represents the potential evaporation from soils plus transpiration by plants. It's widely used in agricultural water management and irrigation planning.
The calculator uses the Blaney Criddle equation:
Where:
Explanation: The equation calculates seasonal water loss from an area of land due to plant growth and evaporation, typically expressed in acre-feet but converted to centimeters in this formula.
Details: Accurate evapotranspiration estimation is crucial for irrigation scheduling, water resource management, crop yield prediction, and sustainable agricultural practices.
Tips: Enter the empirical coefficient K (e.g., Wheat-0.65, Sugarcane-0.90) and the sum of monthly consumptive use factors F. Both values must be positive numbers.
Q1: What are typical values for the empirical coefficient K?
A: K values vary by crop type and growth stage. Common examples include Wheat-0.65, Sugarcane-0.90, Maize-0.75, and Cotton-0.85.
Q2: How is the sum of monthly consumptive use factors determined?
A: F is calculated by summing monthly values that consider temperature, daylight hours, and crop characteristics over the growing season.
Q3: What are the limitations of the Blaney Criddle method?
A: The method is primarily temperature-based and may be less accurate in humid climates or for crops with atypical water use patterns.
Q4: How does this equation compare to other evapotranspiration methods?
A: Blaney Criddle is simpler than Penman-Monteith but provides reasonable estimates for irrigation planning in many agricultural settings.
Q5: Can this method be used for all crop types?
A: While applicable to many crops, specific K values should be used for different crop types and local calibration may improve accuracy.