Dr. Greenhouse, Inc., a provider of HVAC design and controls solutions for indoor grow, vertical farms and greenhouses, has launched the Dr. Greenhouse VPD Calculator App. The VPD Calculator app helps growers understand the effects of the indoor grow environment on plant responses and HVAC equipment operation.
Our VPD calculator is the most visited resource on our website. Our team has decided to build a mobile VPD Calculator App for growers and farmers to calculate their environment's VPD, notes Dr. Nadia Sabeh, President of Dr. Greenhouse, Inc. It is important to know the best environment for plant steering and health to ensure optimal crop outcomes and timing are achieved. Vapor pressure deficit VPD represents the pressure that air puts on the plant to transpire and move water and nutrients from the roots to other parts of the plant. For example:
With low humidity and high VPD levels, there is more pressure on the plant to transpire and use more water. Plants may begin to wilt if they are not well-watered under high VPD levels.
With low humidity and low VPD levels, there will be less pressure on the plant. Plants are susceptible to pest pressures if they are over-watered under low VPD levels.
The VPD can be a valuable metric for growers to predict water use, steer crops for optimal growth and operate HVAC equipment to achieve the desired indoor plant environment.
The Dr. Greenhouse VPD Calculator App supports all crop types and includes VPD lookup tables for cannabis, leafy greens, and tomatoes. The VPD Calculator App allows growers to use their existing air temperature and humidity sensors to determine if the room condition is more suitable for vegetative, flowering, or stress-induced plants. The VPD Calculator App provides color-coded results to indicate if the room is humid blue vegetative green or reproductive yellow or dry purple. For facility designers and grow house managers, the VPD Calculator App can predict evapotranspiration rates to estimate water usage and dehumidification requirements. The HVAC equipment can be designed to meet facility climate control goals with this information.
Sabeh comments on the VPD, crop production, and facility HVAC design. When the right VPD is targeted for a given crop, variables such as light source, nutrients, water, HVAC, and dehumidification can be controlled to minimize operating costs while maximizing plant growth and health. The Dr. Greenhouse VPD Calculator is free to download in Apple's App Store and Google Play Store.