Abstract:
When woody plants are
subjected to a sudden large drop in
temperature, injury or even death of plants
can occur. An electrical heater unit designed
for cold protection tree in winter. It made up
from three layers. Material of middle layers
was from glass wool and two outer layers
were from waterproof rubber covering.
Thermal wires were placed inside the layers.
Electrical heater of tree could be used for
trees with trunk diameter between 15 cm to
45 cm. The electrical heater around the
trunk was wrapped, and then in a cooler
chamber was placed. Tests carried out in
five different temperatures (-8, -12, -15, -18
and -20 °C) with five replications on the
same trunk. Essential power and voltage for
this electrical heater was 54.6 W and 24 V.
Tests results indicated that the tree heater
kept trunk in temperature 20, 19, 18, 15 and
14°C while cooler chamber temperature was
-8, -12, -15, -18 and -20°C, respectively.
