| Treeshelters were used for the nursery production of Cedrus
deodara Loud. (deodar cedar), Quercus ilex L. (holly oak), and
Magnolia grandiflora L. (southern magnolia) trees growing in 19-liter
containers. Air temperature, relative humidity, and CO2 concentration
were higher inside the treeshelters than outside. Trees grown inside treeshelters
were 74% to 174% taller than trees grown without shelters. Trunk caliper
of Magnolia and Quercus was not affected; however, for Cedrus
trees caliper was larger for trees grown without a shelter. Upon removal
of the shelter, Cedrus trees were incapable of supporting their own
weight. Lateral branch development was inhibited and leaf senescence was
greater with Magnolia trees grown in a shelter. Quercus trees grown
in shelters were ready to be transplanted into the landscape. Water use
was similar for trees grown with or without shelters. Trees grown in shelters
had lower root fresh weights. |