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Overwintering Garlic in High Tunnels

Purpose of the Research. With winter temperatures reaching as low as

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Overwintering Garlic in High Tunnels

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    1. Overwintering Garlic in High Tunnels Terrance T. Nennich Extension Professor Commercial Fruit and Vegetable Production University of Minnesota Extension. nenni001@umn.edu

    2. Purpose of the Research With winter temperatures reaching as low as – 40 to – 50 F degrees in Zone 2 and 3 and the inside soil of high tunnels receiving no snow protection, would fall planted garlic survive the winter and produce a good early crop the next spring?

    3. Research Location The location of the research was Bagley Minnesota, about 25 miles west of Bemidji. Zone 2 – 3

    4. The garlic research project was conducted over a three year period 2005, 2006 ( planted, harvested) 2006, 2007 2007, 2008

    5. Variety Selection. The variety Music was selected for all three years of this study.

    6. Tunnel Design Two different high tunnel designs were used in this research project. Gothic V roof design Small round design.

    8. Planting Dates - Outside The garlic was planted on the following dates outside of the tunnel 2005 September 21 2006 September 23 2007 September 19 Six inches of straw was applied following planting.

    9. Planting Dates Inside the Tunnels 2005 October 20 2006 October 18 2007 October 22 Six inches of straw was applied 30 day after planting

    10. Cold Temperature Data Days below 0 F Coldest Day 2005-06 17 days -37 F 2006-07 24 days -41 F 2007-08 33 days -38 F The 2006-2007 winter had 8 consecutive night -20F or colder.

    11. Snow Fall Data 2005-2006 Ample but below average 2006- 2007 Little snow cover 2007- 2008 Average snow cover

    12. Survival Rate (%) Inside Tunnel Gothic 2005 – 06 94% 2006-2007 92% 2007-2008 95%

    13. Survival Rate (%) Inside Tunnel Round 2005 – 2006 92% 2006 – 2007 87% 2007 – 2008 94%

    14. Survival Rate Outside Tunnel 2005 – 06 69% 2006 – 07 2% 2007 – 08 79%

    15. Harvest Data Average 3 year harvest was 21 days earlier in high tunnels.

    16. Size Difference The size of the garlic grown in the high tunnels was about 30% more then outside. Hard to statically compare because of different soils, fertility, rainfall, ect.

    17. Results The effect of extreme cold winter temperatures of the variety Music Garlic grown in high tunnels in zone 2 or 3 has little effect on garlic winter survival. The garlic grown in high tunnels had a much higher survival rate and increased size then the garlic grown outside. Drastic differences were noted in 2006 -07 when there was very little snow cover outside.

    18. Future Research In the fall of 2008, 18 different varieties, many soft neck were planted in the high tunnel

    19. Future Research Given this data, how will other perennial plants overwinter in high tunnels????

    20. Questions????????????????????????????????????????????????????????????????????????????????????

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