- Production Manager
- Assistant Professor - Controlled Environments Entomologist
- Technical Development Specialist | Horticulture | France
- Director of Business Development | Middle East | Agtech
- Farm/Production Manager; Berlin (m/w/d)
- Trader Asian Market
- Avocado Growing Manager - Kenya
- Operations Accountant
- Sales Manager for Nordic countries (H/F)
- Senior Breeder
Top 5 -yesterday
- Coal and pink tomatoes: the challenges for Polish growers
- Healthy seeds, and good germination with Plasma Activated Water seed treatment
- J. Huete International builds high-tech greenhouse for seed research in South America
- NZ: Return of the watermelon
- Tropicalia Greenhouse in Northern France blends perfectly with surroundings
Top 5 -last week
Top 5 -last month
- Zambia: "We produce 5,000 units of lettuce per week, per tunnel, year-round"
- UK growers stop planting and put nurseries on sale amidst energy crisis and labor shortage
- Passive solar greenhouses: How Ladakh farmers are harvesting crops in winter
- "High-tech farmer AppHarvest is running out of money"
- German family company switches from tomato cultivation to hydroponic lettuce
US (MT): Insulating greenhouses for the winter
The SIFT farm under snow in early November. Photo: NCAT
Winter got an early start in Butte this year. We have barely stepped into November and the ground is already blanketed in snow and there have been temperatures below 0°F. The greenhouse has been able to hold the inside air temperature around 30°F warmer than the outside on days with clear skies. Cloud cover depletes the solar energy needed to heat the greenhouse, making it difficult to hold in the heat. Last year, the freestanding greenhouse held to 1°F on a morning that fell below -30°F. Though this temperature is well below the capabilities of growing produce, there is significant potential to keep the inside of the structure above freezing with a small input of heat.
The growers have added extra insulation on the back walls of the freestanding greenhouse by using water-heater covers to keep the colder, north side from cooling the building. As well, they have hung blankets on the front that can be drawn back during the day to let light in and closed at night to keep heat in. As a final defense, they have used a poly film to drape over trays of microgreens and lettuce so that below-freezing air does not settle onto the plants.
SIFT are looking at ways to supplement light and heat that will not significantly increase inputs. One option is to find a way to use solar panels to charge a battery that can run small lights and a heater. An oil heater may be the next best option; however, they want to hold true to their objective of sustainability.
The other greenhouse is attached to the south side of the building, from which it receives residual heat. Though this area has not shown to operate effectively throughout the winter, it still holds quite a bit warmer than the freestanding greenhouse. Hardy mint and herbs are currently growing in here and have survived all of the weather we have gotten. One potential for this greenhouse is an area that recesses in the back corner. This area does not receive much direct light and will need to be supplemented with lights.
The plan is to build a microgreen stand that can operate off of fluorescent lights. Microgreens do not need much solar energy because most of their energy comes from the seed itself. They are also looking into using a sodium lamp or a metal halide light for larger plants. Low-pressure sodium lamps give off a red hue that is effective for mature, fruiting plants. The reddish light simulates fall sunlight when the sunlight comes in at an angle to the atmosphere. On the other hand, metal halide lights give off a bluer hue that simulates the direct light during summer. The combination of these allows for a wide spectrum of light to infiltrate the plants leaves and stimulate rapid growth.
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Other news in this sector:
- 2022-11-30 US (WY): Enactus members construct greenhouse for Riverview residents
- 2022-11-29 Air raid shelter becomes underground farm in Clapham, south London
- 2022-11-28 Snacking trend leads to increased year-round production of mini cucumbers
- 2022-11-28 India: Krishnagiri growers are discovering the benefits of CEA
- 2022-11-28 US (AK): BIA awards T&H $2 million for greenhouse expansion project
- 2022-11-25 State media review: North Korea rewards greenhouse workers with new homes
- 2022-11-25 Influence of exogenous application of glycine betaine on strawberry
- 2022-11-23 How to install a double-layer inflated plastic
- 2022-11-22 UK: Heating system explodes on Essex farm, setting greenhouse on fire
- 2022-11-15 Maurice adopted ValkTwinRail ventilation system in its greenhouse in the Netherlands
- 2022-11-14 Texas A&M AgriLife seeks input on controlled environment agriculture
- 2022-11-11 Omaha restaurant uses greenhouse to grow their produce
- 2022-11-08 Philippines: Harnessing digitalization for smart agriculture
- 2022-11-04 US (KY): AppHarvest opens 30-acre indoor farm to grow strawberries and cucumbers
- 2022-11-04 Uzbekistan: Measures defined to support greenhouses
- 2022-11-04 "Urban greenhouses need to be intergrated with the urban environment"
- 2022-11-03 Canadian greenhouse season transitions into Mexico
- 2022-11-02 50 million USD geothermal greenhouse to be established in Kirsehir, Türkiye
- 2022-11-01 Banana growers from Hatay, Türkiye note that greenhouse production costs cause production decline
- 2022-11-01 First greenhouse tomato harvest has started in greenhouses in Antalya