Posts Tagged ‘GDD’
What are growing degree days?What are growing degree days? The Growing Degree Day, or GDD, is a heat index that can be used to predict when a crop will reach maturity. Each day’s GDD is calculated by subtracting a reference temperature, which varies with plant species, from the daily mean temperature (we ignore values less than zero). The reference [...]
Monday, July 26th, 2010
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