Temperature - Plant growth is maximized in the range of 77 - 86 degrees Fahrenheit. Too low of a temperature and the plants growth can be stunted. Too high of a temperature and the plants will transpire too much and as a result uptake nutrients at an increased rate which may cause the plant stress.
Humidity - Maintaining and ideal humidity level throughout the grow cycle is important for achieving a stable rate of evapotranspiration. ▫️VPD (vapor pressure deficit)▫️ is a measure of room temperature, plant temperature and humidity. Hot and dry grow spaces will cause plants to transpire too much and as a result uptake nutrients at an increased rate which may cause the plant stress.
Light - A PPFD (Photosynthetic Photon Flux Density) reading of 700- 800 is an ideal intensity for fruiting and flowering crops to reach their full potential. If you provide a plant with more than 1000 PPFD the plant should have access to an elevated source of CO2 in order to increase its metabolism and process all the extra light energy. The light requirement can be cut in half for the vegetative growth stage.
CO2 - The atmospheric level of CO2 is around 370 ppm (parts per million) and in an occupied building this number is doubled. It’s hard to use a CO2 supplement and maintain a consistent level in a vented grow room and this is one reason that sealed grow rooms are becoming more popular.
▫️Here are some options▫️ for climate control in a grow space to really dial in your environment.
David Cutrona is a sales associate at Green Dragon Hydroponics with experience in hydroponics and soil cultivation and an architectural draftsman with experience in 3D grow room design and as-built building surveys.