Agriculture Reference
In-Depth Information
(a) Autumn-winter
N
Tr ansmission of direct radiation
Reflected
Reflected
Incident
Incident
Tr ansmitted
Tr ansmitted
(b) Spring-summer
Tr ansmission of direct radiation
Incident
Incident
N
Reflected
Reflected
Tr ansmitted
Tr ansmitted
Fig. 4.20.
Transmission and reflection of direct solar radiation in greenhouses with low and high roof
slopes, in the south of Spain (37°N) in autumn-winter (a) and spring-summer (b).
humidity in the air) or using drip irrigation
and/or mulching (which reduces water
evaporation from the soil); (iii) orienting the
crop rows north-south; and (iv) painting
the structural elements in white and using
white mulch to reflect the radiation.
(
Greenhouses: design and construction.
Part 1: Greenhouses for commercial culti-
vation
). This regulation specifies the
general principles and requirements of
mechanical resistance and stability, state
of use and durability for the design
and construction of commercial green-
house structures (including the founda-
tions) for the cultivation of plants and
crops.
Regulation UNE-EN-1303212 has
replaced the experimental regulation UNE-
76208.
Greenhouse Structures
Regulation UNE-EN-13031 is the Spanish
version of European regulation EN-13031-1
