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John W. Bartok on Muck Rack

John W. Bartok

As seen in: Cannabis Business Times, Greenhouse Management
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Articles

20 Tips For Greenhouse Winterization

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By John W. Bartok
| Cannabis Business Times Verified
Infiltration Air gaps are a major source of heat loss in many greenhouses. A 48-inch fan shutter with 1-inch gaps between blades can allow as much as 25,000 Btu per hour (Btu/hr) to escape. Inspect these areas as you walk your greenhouse’s perimeter: 1. Glazing: Secure glazing to prevent plastic failure, repair or replace torn plastic, and adjust inflation pressure to ¼-inch static pressure. Clean and lubricate inflation blowers. Remove any shading, as light is critical during winter. 2.
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20 Tips For Greenhouse Winterization

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By John W. Bartok
| Cannabis Business Times Verified
As we transition into winter, energy use begins to increase and greenhouses are subject to severe weather. Reviewing the following tips while you perform an inspection of your facilities and equipment will point out where maintenance and improvements need to be made. Infiltration Air gaps are a major source of heat loss in many greenhouses. A 48-inch fan shutter with 1-inch gaps between blades can allow as much as 25,000 Btu per hour (Btu/hr) to escape.
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Reduce phosphorous during finishing to control growth

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By Christopher J. Currey, Kate Spirgen Verified, Chris Manning Verified, John W. Bartok
| Greenhouse Management Verified
Photo courtesy of Christopher J. Currey Reducing phosphorous (P) during plug production has become a standard practice to control growth. However, this technique does not need to be limited to plugs. Rather, recent research is showing that reducing P during finishing for containerized crops can control unwanted stretch while producing marketable plants. P2O5 versus P Before discussing P further, some clarity is required.
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