Year-round High Tunnel Production Steve Moore, NCSU The Center for Environmental Farming Systems Goldsboro NC Cell 919 218 4642 National.

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Presentation transcript:

Year-round High Tunnel Production Steve Moore, NCSU The Center for Environmental Farming Systems Goldsboro NC Cell National SARE Conference March 25-27, 2008 Kansas City, Missouri

Fossil Fuel Heated Greenhouse

Historic Uses of Season Extension

Reasons for Season Extension Maintain important sales outlets and customers Spread out cash flow Spread labor more evenly over the year Sell products at higher (out of season) prices Provide customers with greater diversity of products Fresher and more nutritious produce Produce higher gross sales and higher income per unit of area Moderate climate change irregularities Contribute to a more sustaining food system by lowering energy demands. distance food travels, creating a more regional food system

Heat Sources Solar energy (light and heat) –Insolation, regional and site –Greenhouse orientation Ambient heat of the earth Thermal decay of a highly organic soil

Effects of Structure Design on Thermal Performance Gothic arch shape Relationship of perimeter to surface area Perimeter ground insolation Use of interior covers Types of films and coverings Interior layouts Gable end layout and ventilation

Passive Solar Design

Passive Solar Greenhouse (March)

Key bed Greenhouse Layout

Inner Covers Closed for the Night

Thermal Performance of inner and outer covers in unheated Greenhouses standardized to outside for average temperatures mid December-mid February and for the average of five cold nights

Effects of various inner covers on Poc Choi (6mil plastic, typar, no cover)

Winter Vegetables Lettuce (head and mixes) Asian and other greens Spinach Parsley Spring onions Kale Collards Poc choi Radish Turnips Chard Celery Herbs

Management Considerations Soil salinization IPM Nitrate uptake in winter greens Variety selection and development Maximize yield within the structure

Effects of Salinity in Greenhouse Pepper Production (2003) High: 3.89 dS/m, Medium: 2.51 dS/m, Low: 0.85 dS/m

Maximizing Production Use well started transplants in open flats Close Plant spacings –6” spacings give 621 plants/100 sq. ft., 8”-320 plants, 10”-201 plants, 12”-159 plants Interplanting Multilayer using troughs 4 Square plantings Utilize pathways for flat production

Maximizing Ptoduction

Early Summer (99)

Importance of Variety Selection Cold growth difference between Outredgious (L) and Oscarde (R)

Winter Greenhouse (harvest)

Jan. ’97 (weekly min. -7 degrees F.)

New Style Hot Bed

Old Style Hot Bed

Plant Starter Temperatures 1999

Cherry Tomatoes (in cages) European single Leaders Tomatoes (on Strings)

Yields (1999) Peppers –New Ace, 561 lbs/100 sq.ft. –Vidi, 513 lbs/100 sq.ft. Eggplant –Orient Express, 396 lbs/100 sq.ft. –Neon, 288 lbs/100 sq.ft.

Peppers Harvest (late December)

Zone 3 (Northern Vermont)

Cost of Season Extension

Steve Moore North Carolina State University Reprint courtesy of Harmony Essentials