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High Tunnel Production

Joanna visits with Kevin Lyons, Monroe County Extension Agent for Agriculture to discuss high tunnel production. High tunnels are relatively simple polyethylene-covered unheated structures placed over irrigated ground beds. Also known as hoop houses, high tunnels can be used to extend the production season of a wide variety of crops in Kentucky, including strawberries. A plasticulture system with drip irrigation is recommended when using high tunnels for strawberry production. High tunnels provide protection from unfavorable weather conditions, including wind, hail, frost, and excessive rainfall. This can translate into a better survival rate of strawberry plants, as well as earlier berries. Some states report higher yields in tunnels; however, that has not consistently been the case in University of Kentucky research trials. High tunnels also provide a sheltered environment for pickers during harvest. While site selection for high tunnel strawberries is similar to that of strawberries planted in an open field, there are important considerations unique to high tunnel production. Tunnel location and orientation, in addition to soil conditions, are important for success. The production site should be selected sufficiently in advance to allow for tunnel construction and preparation of raised beds prior to a fall planting. Avoid areas subject to high winds, or provide a windbreak to reduce the threat of structural damage to the tunnel. A relatively level surface is needed for the high tunnel frame. Strawberries prefer a deep, sandy loam soil well supplied with organic matter. For annual plasticulture production, this type of soil also works best for building and shaping the 4-8-inch raised beds critical for success. Fertility levels should be adjusted before setting plants. Avoid fields that have been in potatoes, tobacco, peppers, eggplants or tomatoes due to potential problems with Verticillium wilt. Placing the tunnel on ground that is slightly higher than the surrounding area helps prevent water from flowing into the tunnel during heavy rains. A reliable water supply needs to be available for irrigation. Orienting the houses perpendicular to the prevailing wind on the farm will help facilitate air movement; however, placement in an east-west direction facilitates sun exposure. When constructing multiple tunnels, make sure that they do not shade one another. Once permanent tunnels are in place, laying plastic mulch, cultivation, and amending the soil can present a challenge unless access for equipment is provided by hinged or removable endwalls. Whether the tunnel is used for the annual system or for perennial beds, the grower should be aware that salts can build up in the soil. Make sure to mark your calendars and get registered for the Mammoth Cave Area Virtual Field Day on Tuesday, October 27 from 6 - 7 pm. For more information contact and follow us on social media. Warren County Cooperative Extension Service https://www.warrencountyextension.com   / warrencountyag   https://warrencountyagriculture.com   / warrencoag