Oct 29 2018
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An Introduction to Vapor Pressure Deficit

How well do you understand temperature and relative humidity? By Harry Connor Vapor Pressure Deficit (VPD) is used by growers to assess how dry the air is at a given moment. If the air is too dry, photosynthesis will stop in order to protect the plant from exhaustion. Photosynthesis is the process of converting sunlight,…
polycarbonate greenhouse roof
Jul 03 2017
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How to Choose a Glazing Material for a Year Round Greenhouse

Below is an excerpt from The Year Round Solar Greenhouse. For more on choosing a glazing material for a greenhouse, plus costs and tips for installing glazing materials, please see the book. We live in a plastic-laden age, so when it comes to choosing a material for a year round greenhouse, the choices can get…
cannabis close up
Jun 12 2017
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5 Tools for Planning an Energy Efficient Commercial Greenhouse

With demand for local food continuing at a strong pace, a year-round greenhouse is often a good business venture. You can greatly improve your chances for a successful greenhouse business with proper planning. Planning for a greenhouse business requires basic business planning -- thorough research and usually spreadsheets. Here are five essential tools to aid that process, based…
Greenhouse Controls for GAHT system
Jun 02 2017
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Setting Controls in a GAHT System or Climate Battery

A climate battery is a ground to air heat exchanger, which provides year-round heating and cooling of solar greenhouses and other structures using the thermal mass of the soil underground. Ceres’ patent-pending Ground to Air Heat Transfer (GAHT™) is a high-performance climate battery specialized for year round greenhouse growers. For more on how a GAHT™…
light deprivation in greenhouse
Oct 04 2016
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5 Things to Look for in a Light Deprivation System

As commercial cannabis production shifts to advanced year-round greenhouses, both growers and the environment stand to benefit. Greenhouses are many times more energy-efficient than indoor grow rooms, and can provide precise environmental control. Essential to control is a light deprivation system, which allows greenhouse growers to control the photoperiod, allowing for the 12/12 cycle required…