Several of you have asked to see our latest (2011) yield trials. We have trials of primocane and floricane blackberry and raspberry cultivars at the Upper Mountain Research Station in Laurel Springs, NC. We call this our mirror study, because we have the same plots both inside and outside of a multibay high tunnel. It is at about 2000 ft so is our coolest site. Both years, berries in the tunnels were protected once we had temperatures below 32 F. The trial will be maintained for one more year. The yield data can be found here, click on blue highlighted bullets in the third section on this page:
http://ncsu.edu/enterprises/blackberries-raspberries/production/latest-research/
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