Greenhouse Flashcards
Prevent excess solar radiation in the greenhouse
Shading
Method of greenhouse construction where modular roof units are connected at the eave by a common gutter
Ridge and Furrow greenhouse
Greenhouse benches should be up to _____m wide if they are to be access from both sides, and
should not exceed ___m if they are accessible only from one side.
1.8 m- accessible for both side
0.9 m- accessible to one side only
For fixed benches the usable space should be _______ of the floor area while
______ for rolling benches.
66% - 75%- fixed benches
90%- rolling benches
Population density per square meter of bench based on pot sizes
Pot size. Population density/m² of bench
(mm-d)
10. - 100
16. - 36
300. - 16
If the walkway will be used only as a place to stand while servicing the benches, a
minimum of ______ aisle shall be used for determinate crops and a minimum of _____ aisle
for indeterminate crops.
0.30 m- determinate
0.80 m- indeterminate
Larger
greenhouses often have _________ secondary aisle and ________ primary aisle
0.60 m - 0.90 m- secondary
1.2 m - 1.8 m- primary
When figuring the length of a plastic structure, an extra ______ shall be
allowed to fasten the plastic properly, for glass, allow for the width of the projecting part of
each sash bar plus a fraction of an inch clearance.
0.60 m
The length of the greenhouse should not exceed _______.
50 m
For gutter connected
greenhouses, the total width should not exceed ______ for well distribution of air.
50 m
The eave height for a gable roof greenhouse shall be at least ____ with a minimum
gable height of _____.
1.70 m- eave height
2.4 m- minimum gable height
Gutter heights of _______ are recommended for multi span
houses to allow machines to move freely.
2.8 m - 3.0m
The height of the house in the walk areas shall not be less than _______.
2.0 m
For tall crops ______ shall be the minimum height at the eaves
2.0 m
For permanent greenhouses, all foundations shall be of durable material and
shall extend to a minimum depth of ________.
0.45 m
Greenhouse walls, height of side posts and columns should be _______.
0.30 m - 3 m
Framing shall adequately support the covering and any equipment and/or hanging
baskets suspended from the framing. It shall be able to carry trellising loads up to ________.
25 kg/m2
Framing shall be able to withstand maximum wind gusts of _____.
250 km/hr
Purlins should be connected by a cross tie. ________ spacing should be used
depending on the size of the greenhouse.
One to 2.5 m
Most economical material for constructing the greenhouse frames, it can be shaped to form
various structural components and needs no maintenance after installation.
Aluminum
Roof pitch for a glass greenhouse should be ______ to prevent inside condensation
from dripping on plants.
51%
Plastic covered greenhouses require a steeper pitch of ________ to prevent drip.
58% - 70%
For gutter connected greenhouses a _____ slope shall be provided for drainage.
2%
If walking tractors are
to be used, ____ wide standard doors shall be provided. A minimum of ______ wide side
doors shall be used.
1.2 m- tractor
0.8 m- minimum width
A concrete, gravel or stone walkway ________ wide should be built for easy
access to the plants.
0.60 m – 0.9 m
Benches should be of height and width suitable to an averaged size worker,
benches shall not exceed _______ high when against a wall.
0.90 m
The ________ type bench arrangement gives the greatest amount of bench area
per unit of aisle space and permits convenient access to all areas.
peninsular type bench arrangement
Artificial lighting should be provided for the production of photo-period sensitive plants and
for the workers, ________ should be provided.
200 lux
__________ are the most efficient and provide greater control over the
amount of water applied
Drip or tickle systems
A general rule of thumb to follow in irrigating greenhouse crops is to apply _______ more water than the container will hold to facilitate leaching at each irrigation and
reduce the potential for the accumulation of soluble salts.
10%-15%
The recommended drainage rate is _________ of the water dose given to the
plant. The drained water should be contained in a storage tank.
30% - 50%
Fans should be spaced not more than ______ apart for uniform ventilation.
7.5 m
