METEOROLOGY – GROWING EAON & AGRICULTURE CALCULATOR
Phenological Stage
A precise tool.
What is the Phenological Stage & How does it work?
Growing Degree Days (GDD) are a measure used in agriculture to predict the progress of plant development stages. GDD is calculated by summing up the daily average temperature above a base temperature, typically set at 10°C for many crops.
The phenological stage of a crop can be determined by accumulating GDD until it reaches specific thresholds that correspond to different growth stages. For example, the seedling stage might require 50 GDD, while the flowering stage might require 1200 GDD.
GDD = sum (T_{text{avg}} – T_{text{base}}) quad text{where} quad T_{text{avg}} > T_{text{base}}
GDD = Growing Degree Days, Tavg = Daily Average Temperature, Tbase = Base Temperature (usually 10°C)
Parameters
Result
—
Frequently Asked Questions
What is Growing Degree Days (GDD)?
Growing Degree Days (GDD) are a measure used in agriculture to predict the progress of plant development stages by summing up the daily average temperature above a base temperature.
How do I calculate GDD?
To calculate GDD, subtract the base temperature from the daily average temperature and sum these values over time. The base temperature is typically set at 10°C for many crops.
What is the purpose of using GDD in agriculture?
GDD helps farmers predict crop development stages by accumulating degree days until they reach specific thresholds that correspond to different growth stages, such as seedling or flowering.
Can GDD be used for any type of plant?
While GDD is commonly used for many crops, the base temperature and threshold values may vary depending on the specific plant species and its developmental requirements.
How does temperature affect GDD calculations?
Higher temperatures increase the daily average temperature above the base, resulting in higher GDD accumulation. Lower temperatures reduce this difference, slowing down the GDD calculation.
Results are for informational purposes only and do not constitute professional advice.