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Greenhouse Temperature Control Vegetable Production
   
Greenhouse Temperature Control
Regulating air temperature in the greenhouse is important for both vegetative growth and fruiting. To determine heating requirements, it is essential to know the minimum temperature requirements for the crop, the lowest outdoor temperature that might be expected, and the surface area of the greenhouse. Heat loss also will be affected by wind and site exposure.
Most vegetable production greenhouses in New Mexico are heated by natural gas. Forced-air heaters installed in the ridge area of the greenhouse will take up a minimum of space. It is important to install a heater with sufficient BTU output to heat the greenhouse on the coldest day. Natural and compressed gas heaters should be vented for safety and to prevent crop damage. Thermostats should be located at plant level where plants are growing and where drafts or sunlight do not directly affect them.
Greenhouse cooling also is important. Evaporative cooling is the most efficient and economical way to reduce greenhouse temperatures in New Mexico. Proper ventilation also is important not only for temperature control, but also to replenish carbon dioxide and control relative humidity. Relative humidities above 90 percent will encourage disease problems. Roof ventilators are seldom used on plastic houses, which instead use side vents to provide both ventilation and cooling. Vents should be installed as high on the wall as possible. Shading may be required in the late spring or early fall if daytime temperatures become too high. Various shading materials that can be sprayed or brushed on are available from greenhouse supply companies. However, shade compounds must be removed when cool weather sets in. Shade cloths with various degrees of shading also are available.
Heating, cooling, and ventilation should be automated to save labor and to ensure proper temperature control. Polyethylene ventilation tubes with 3-inch perforation holes along the tube suspended in the peak of the house from one end to the other help evenly mix cooler air with warmer air, preventing drafts.
Juicy the bugBlueRidgeNow.com, NC - Nov 16, 2008"Slowly the livestock production was phased out, leaving the farm with a focus on fruit and vegetable production." In 1994, Debra started educational ... |
State farm group honors two YumansYuma Sun, AZ - Nov 15, 2008In addition to his support of the local farming community, he conducts outreach and extension activities in vegetable production for producers and industry ... |
Old Nursery Pots used as FuelPenn State Master Gardeners, PA - Nov 15, 2008One that shows promise is used agricultural plastics like old nursery pots, greenhouse plastic and plastic film mulch used in vegetable production. ... |
.vegetable-production. - Google News
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