Articles
EFFECT OF WATER SPRINKLING ON COVER, WITH AND WITHOUT HEAT SUPPLY TO NIGHT TEMPERATURE OF GREENHOUSE IN WINTER.
During the winter of 1992, the effect of water sprinkling was evaluated on the temperatures of the ground, environment, cover and strawberry plants during the night.
The sprinkling was carried out by 2 lines of micro-sprinklers producing a rain of water of 3 mm/hour.
This technique was combined with heat supply by burning coal in containers of 200 1 (1 container/greenhouse).
In greenhouses with no heating the temperature of air at 5 cm. weas always higher than 1.50 m and greater or the same as 3 m high.
The temperature of the cover at the top of the check was always lower than the outside temperature, while the temperature at the top of the water sprinkling greenhouse ranged from 0 and -1 C. The outside temperatures were several degrees lower than 0 C. The water sprinkling on the covering improved significantly the temperatures at 5 cm, at 1.5 m. and at the strawberry leaf in relation to the control.
These differences were more significant when the outside temperatures were lower.
With respect to heating, the maximum temperature was registered after 1 hour of being the heating on, then it decreased up to environmental values (5 cm. and 1.5 m) higher from 3 to 5 C than those values previous to the ignition.