Agriculture Reference
In-Depth Information
photosynthesis and, as a consequence,
the yield.
Greenhouse ventilation is necessary to
•
Transpiration by the crop has a great
effect on air humidity and the decrease
of temperatures.
The air CO
•
avoid excessive warming during the
daytime, to maintain minimum accept-
able CO
2
levels and to avoid excessive
air humidity.
At night, as the greenhouse gets colder,
•
2
content during the daytime,
if there is no renewal of the inside air,
may decrease to values of the order of
200 ppm, negatively affecting the yield.
During the night, CO
2
levels are higher
than in the outside air, due to the CO
2
supplies from plant respiration and
from the soil.
•
the RH increases and may reach satura-
tion, and then condensation occurs
over the greenhouse surfaces.
