Prepare Your Growing Environment for Maximum Harvest

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Update time : 2023-02-28 14:08:04

Preparing your growing environment is crucial for achieving a maximum harvest.  In order to successfully cultivate cannabis, you will need to understand how cannabis grows, the relationship between environmental variables, and how to effectively manage vapor pressure deficit (VPD) at different energy levels.

Daily Light Integral (DLI)
For the purposes of commercial cultivation, it's important to know that cannabis is a "high DLI, short day" flowering plant. Cannabis has a high DLI because it works harder and is able to use light to drive more photosynthesis than most plants. In nature, cannabis also flowers during fall-winter months due to the longer dark periods of 12 hours or more. Key takeaway – A sufficient photoperiod schedule for cannabis cultivation consists of a long 18-hour photoperiod application during the beginning stages (stock production, propagation, and vegetative stages) followed by a short 12-hour photoperiod during the flowering stage.

The relationship of environmental variables
There are a variety of environmental variables that play an essential role in cannabis cultivation. Heating, ventilation, and air conditioning (HVAC) and vapor pressure deficit (VPD) are two important variables that greatly impact the cultivation of cannabis. HVAC requirements change intricately when you increase light intensities in your environment. VPD is the measurement of the difference between saturation vapor pressure inside cells and the vapor pressure of a room’s air at a given temperature and humidity level. VPD affects how plants cool themselves by releasing moisture into the air, otherwise known as transpiration. When VPD is high, transpiration is rapid. In comparison, when VPD is low, transpiration is slow. At very low VPD levels, a film of dew can form on the plants, providing a medium for mildew and disease. At very high VPD levels, plants will use more water for transpiration, affecting irrigation and nutrient usage.

Effectively manage VPD with sensible and latent energy
Under higher light intensities, targeting a specific vapor pressure deficit is an effective strategy for controlling transpiration and overall plant deployment. However, to effectively manage VPD, it is important to understand the dynamics of the grow room environment, including how and when heat and moisture are generated.
For example, LED fixtures create less heat than high-intensity discharge lamps (HID). That often means the cultivation space needs more dehumidification and less sensible-heat cooling.

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