1. What is Growing Degree Units (GDU)?

Growing Degree Units (GDU) is a measurement of heat accumulation used to predict plant development rates. For trees, it helps estimate growth stages and timing of key physiological events based on temperature patterns.

2. How Does the Calculator Work?

The calculator uses the GDU formula:

Where:

• \( Max \) — Maximum daily temperature (°F)
• \( Min \) — Minimum daily temperature (°F)

Explanation: The formula calculates the average daily temperature above the base temperature of 50°F, which is the threshold for most tree growth.

3. Importance of GDU Calculation

Details: GDU accumulation helps predict tree growth stages, flowering times, fruit development, and harvest readiness. It's essential for agricultural planning and management.

4. Using the Calculator

Tips: Enter maximum and minimum temperatures in Fahrenheit. Values should represent typical daily temperature ranges for accurate GDU calculations.

5. Frequently Asked Questions (FAQ)

Q1: Why is 50°F used as the base temperature?
A: 50°F is generally accepted as the temperature threshold below which most tree growth and development processes are minimal or cease.

Q2: How are GDUs accumulated over time?
A: Daily GDUs are summed over the growing season to track cumulative heat units and predict developmental milestones.

Q3: Can this calculator be used for all tree species?
A: While the 50°F base works for many temperate tree species, some species may have different temperature requirements.

Q4: What if temperatures drop below 50°F?
A: When the average temperature is below 50°F, GDU values will be negative or zero, indicating no growth accumulation for that day.

Q5: How accurate are GDU predictions?
A: GDU predictions are generally reliable but can be affected by other environmental factors like moisture, sunlight, and soil conditions.