Greenhouse

Question 1

Prevent excess solar radiation in the greenhouse

Answer 1

Shading

Question 2

Method of greenhouse construction where modular roof units are connected at the eave by a common gutter

Answer 2

Ridge and Furrow greenhouse

Question 3

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.

Answer 3

1.8 m- accessible for both side
0.9 m- accessible to one side only

Question 4

For fixed benches the usable space should be _______ of the floor area while
______ for rolling benches.

Answer 4

66% - 75%- fixed benches
90%- rolling benches

Question 5

Population density per square meter of bench based on pot sizes

Answer 5

Pot size. Population density/m² of bench
(mm-d)
10. - 100
16. - 36
300. - 16

Question 6

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.

Answer 6

0.30 m- determinate

0.80 m- indeterminate

Question 7

Larger
greenhouses often have _________ secondary aisle and ________ primary aisle

Answer 7

0.60 m - 0.90 m- secondary
1.2 m - 1.8 m- primary

Question 8

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.

Answer 8

0.60 m

Question 9

The length of the greenhouse should not exceed _______.

Answer 9

50 m

Question 10

For gutter connected
greenhouses, the total width should not exceed ______ for well distribution of air.

Answer 10

50 m

Question 11

The eave height for a gable roof greenhouse shall be at least ____ with a minimum
gable height of _____.

Answer 11

1.70 m- eave height
2.4 m- minimum gable height

Question 12

Gutter heights of _______ are recommended for multi span
houses to allow machines to move freely.

Answer 12

2.8 m - 3.0m

Question 13

The height of the house in the walk areas shall not be less than _______.

Answer 13

2.0 m

Question 14

For tall crops ______ shall be the minimum height at the eaves

Answer 14

2.0 m

Question 15

For permanent greenhouses, all foundations shall be of durable material and
shall extend to a minimum depth of ________.

Answer 15

0.45 m

Question 16

Greenhouse walls, height of side posts and columns should be _______.

Answer 16

0.30 m - 3 m

Question 17

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 ________.

Answer 17

25 kg/m2

Question 18

Framing shall be able to withstand maximum wind gusts of _____.

Answer 18

250 km/hr

Question 19

Purlins should be connected by a cross tie. ________ spacing should be used
depending on the size of the greenhouse.

Answer 19

One to 2.5 m

Question 20

Most economical material for constructing the greenhouse frames, it can be shaped to form
various structural components and needs no maintenance after installation.

Answer 20

Aluminum

Question 21

Roof pitch for a glass greenhouse should be ______ to prevent inside condensation
from dripping on plants.

Answer 21

51%

Question 22

Plastic covered greenhouses require a steeper pitch of ________ to prevent drip.

Answer 22

58% - 70%

Question 23

For gutter connected greenhouses a _____ slope shall be provided for drainage.

Answer 23

2%

Question 24

If walking tractors are
to be used, ____ wide standard doors shall be provided. A minimum of ______ wide side
doors shall be used.

Answer 24

1.2 m- tractor
0.8 m- minimum width

Question 25

A concrete, gravel or stone walkway ________ wide should be built for easy
access to the plants.

Answer 25

0.60 m – 0.9 m

Question 26

Benches should be of height and width suitable to an averaged size worker,
benches shall not exceed _______ high when against a wall.

Answer 26

0.90 m

Question 27

The ________ type bench arrangement gives the greatest amount of bench area
per unit of aisle space and permits convenient access to all areas.

Answer 27

peninsular type bench arrangement

Question 28

Artificial lighting should be provided for the production of photo-period sensitive plants and
for the workers, ________ should be provided.

Answer 28

200 lux

Question 29

__________ are the most efficient and provide greater control over the
amount of water applied

Answer 29

Drip or tickle systems

Question 30

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.

Answer 30

10%-15%

Question 31

The recommended drainage rate is _________ of the water dose given to the
plant. The drained water should be contained in a storage tank.

Answer 31

30% - 50%

Question 32

Fans should be spaced not more than ______ apart for uniform ventilation.

Answer 32

7.5 m