Growing Degree Units (GDUs) are a measure of heat accumulation used to predict plant development rates such as the growth stages of corn. The Corn GDU Calculator is a tool designed to help farmers and agriculturalists monitor the accumulation of GDUs over the growing season, thereby forecasting the development stages of corn with greater precision. This tool aids in determining the optimal time for planting, irrigation, pest control, and harvesting.
Formula of Corn GDU Calculator
GDU = (Daily Max Temperature + Daily Min Temperature) / 2 - 50
Here’s a breakdown of the formula:
- Daily Max Temperature: The highest temperature recorded for the day in Fahrenheit.
- Daily Min Temperature: The lowest temperature recorded for the day in Fahrenheit.
- 50: This is a base temperature. Corn development is minimal below 50°F.
Useful Table for Common GDU Values
To assist in the practical application of the corn GDU calculator, the following table outlines common GDU thresholds for different corn growth stages. This table serves as a quick reference for farmers, allowing them to gauge the progress of their crops without daily calculations.
| Corn Growth Stage | GDU Threshold |
|---|---|
| Emergence | 100 – 150 |
| V6 (6 leaves) | 475 – 525 |
| Tasseling | 1135 – 1185 |
| Maturity | 1400 – 1450 |
Example of Corn GDU Calculator
Let’s say the daily maximum temperature is 80°F, and the minimum temperature is 60°F. Using the GDU formula:
GDU = (80 + 60) / 2 - 50 = 70 / 2 - 50 = 20
This calculation indicates that on this particular day, the corn crop accumulates 20 GDUs towards its development.
Most Common FAQs
GDUs are calculated within a specific temperature range. Temperatures above 86°F or below 50°F are adjust because corn development does not increase at the same rate beyond these temperatures.
It’s advisable to calculate GDUs daily to maintain an accurate understanding of your corn’s development stage. However, using the GDU table for common thresholds can minimize the need for daily calculations.
