Maximum Yield USA March 2017 | Page 138

growers know
Airflow During the ‘ Night ’ Period
Regardless of the scope of a light deprivation operation , all cultivators need to consider airflow in their gardens when the tarp is pulled over the canopy during nighttime simulation . This is because the tarp hinders all airflow from outside the canopy , presenting challenges with humidity and subsequent issues with mold and mildew . To remedy these concerns , growers must employ intake and outtake fans similar to those found in indoor growrooms to ensure a steady exchange of air when the coverings are drawn . When choosing the size of inline fans for intakes and outtakes , gardeners should use similar considerations as seen with indoor growing . Exhaust fans should completely exchange the air in a light deprivation garden in five minutes or less . Depending on the size and the structure of a garden , intakes and outtakes can be mounted on the framing system or simply placed on the ground . However , for air to move efficiently , it ’ s essential that the ducting connected to these fans is long enough so that the ends are not covered by the tarp when it is pulled over the frame .

GROWERS MUST EMPLOY INTAKE AND OUTTAKE FANS SIMILAR TO THOSE FOUND IN INDOOR GROWROOMS TO ENSURE A STEADY EXCHANGE OF AIR WHEN THE COVERINGS ARE DRAWN .
Light deprivation greenhouses essentially signal plants that seasons are changing earlier than they actually are , so growers can manipulate their crops to produce more robust and frequent crops . Keep in mind that some plants react better to light deprivation methods than others , and that issues such as excessive heat or humidity , lack of oxygen to the roots , and pest infestations can be prohibitive . Once dialed in , however , light deprivation technology can be used to harvest early and often , particularly in late summer and early fall .
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