1. What is Vapor Pressure Deficit (VPD)?

Vapor Pressure Deficit (VPD) is the difference between the amount of moisture in the air and how much moisture the air can hold when it's saturated. It's a key parameter in plant growth and climate control.

2. How Does the Calculator Work?

The calculator uses the VPD equation:

Where:

• \( SVP \) — Saturation vapor pressure (kPa)
• \( RH \) — Relative humidity (%)

Explanation: The equation calculates the difference between the actual water vapor pressure and the saturation water vapor pressure at a particular temperature.

3. Importance of VPD Calculation

Details: VPD is crucial for understanding plant transpiration rates, managing greenhouse environments, and optimizing growing conditions for different plant species.

4. Using the Calculator

Tips: Enter SVP in kPa and RH as a percentage (0-100%). All values must be valid (SVP > 0, RH between 0-100).

5. Frequently Asked Questions (FAQ)

Q1: What is the ideal VPD range for plants?
A: Generally 0.8-1.2 kPa for most plants, but varies by species and growth stage.

Q2: How does temperature affect VPD?
A: Warmer air can hold more moisture, so temperature directly influences SVP and thus VPD.

Q3: Why use Aroya's VPD calculation method?
A: Aroya's tool provides a standardized approach that's widely recognized in agricultural applications.

Q4: Can VPD be too high or too low?
A: Yes, both extremes can stress plants - too high causes excessive transpiration, too low can lead to poor nutrient uptake.

Q5: How often should VPD be monitored?
A: In controlled environments, continuous monitoring is ideal as VPD can fluctuate with temperature and humidity changes.