Ventilation important in high tunnels University of Missouri
Extension regional horticulture specialist James Quinn talked
about side ventilation in high tunnels at a recent workshop at
MU's Bradford Research and Extension Center. Quinn began his
work with high tunnels at Mizzou in 2003. High tunnels have
become popular in the past decade as a way for produce farmers
to extend their growing season and maximize profits. Quinn said
that drop-down sides on high tunnels need more than a single
sheet of plastic for ground-to-ground cover and are easier to
use. Roll-up sides require only one sheet, but plants near the
edge of the high tunnel can be stunted. "Bigger is better for
side ventilation," Quinn said. High tunnels warm quickly; one
vent open downwind is good for less cooling while opening both
sides allows for more cooling. He recommended that growers
invest in a "max/min" thermometer to aid in keeping the crop
within its preferred growing temperature. High tunnels require
frequent checking-up to three time