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98 Cards in this Set
- Front
- Back
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H |
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The main advantage of a truss roofing system over rafters? |
Wider clearspan floor area |
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True or false Poured concrete or concrete block should be supported by a concrete footing? |
True |
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True or false Normally, greenhouses wooden support posts and sill are 'not' pressure treated? |
False |
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Foundations should extend to below the frost line or to a minimum depth of ... |
18 inches |
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The strongest greenhouse foundation is.. |
Poured concrete |
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True or false Where wind poses a hazard, greenhouses should have a low profile as possible |
True |
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Negative air pressure can be achieved inside a poly covered greenhouse by... |
Closing all doors and intake louvers with the exhaust fan turned on |
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Snow may be removed from gutter connected greenhouse range by ... |
Physical removal Heating the entire greenhouse Providing heat to the gutter areas |
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Which area of the greenhouse structure is most susceptible to damage from excessive crop load |
End wall |
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What type of GH |
Quonset |
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What type of GH |
Post and truss |
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Rigid frame |
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Gothic |
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What type of gh has.. A Clear span up to 60' |
Post and truss |
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Wood frame with the least shading |
Rigid frame |
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Which GH has Sidewall height restrictions |
Quonset |
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Which GH has the highest profile and thus greater resistance to windload |
Gothic arch |
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Wood frame with the most shade potential |
Post and truss |
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Most heat loss per floor area of structure |
Gothic arch |
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Least on site Labour to construct |
Quonset |
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Less difficult to control snow loads Free standing greenhouse range? Gutter connected greenhouse range? |
Free standing greenhouse range |
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Better isolation of disease & insect out break
Free standing greenhouse range?Gutter connected greenhouse range? |
Free standing greenhouse range |
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Lower heating costs Free standing? Or Gutter connected greenhouse range? |
Gutter connected greenhouse range |
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Less difficult to establish different growing environments
Free standing? Or Gutter connected greenhouse range? |
Free standing greenhouse range |
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Better utilization of land Free standing? Or Gutter connected greenhouse range? |
Gutter connected greenhouse range |
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Walk areas in a GH should have a minimum clearance |
2m |
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Most common roof pitch (slope) used for rigid frame GH's |
6-12 |
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Strongest per unit of material used Aluminum Wood Steel |
Steel |
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Shortest life span
Aluminum Wood Steel |
Wood |
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Least expensive
Aluminum Wood Steel |
Wood |
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Subject to rusting
Aluminum Wood Steel |
Steel |
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Most shading problems
Aluminum Wood Steel |
Wood |
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Used for glazing bars and vent frames
Aluminum Wood Steel |
Aluminum |
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Requires the most maintenance Aluminum Wood Steel |
Wood |
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Results in harsh shadows from GH frame
Poly (2 layer) Fiberglass Glass Polycarbonate |
Glass |
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Best heat conservation
Poly(2layer) Fiberglass Glass Polycarbonate |
Poly (2 layer) |
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Lowest cost for material
Poly (2 layer) Fiberglass Glass Polycarbonate |
Poly (2layer) |
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Highest cost for material
Poly (2 layer) Fiberglass Glass Polycarbonate |
Glass |
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Best light transmission
Poly (2 layer) Fiberglass Glass Polycarbonate |
Glass |
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Requires UV stabilizers for increased life span
Poly (2 layer) Fiberglass Glass Polycarbonate |
Poly (2layer) |
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Increased humidity problems inside the GH Poly (2 layer) Fiberglass Glass Polycarbonate |
Poly (2 layer) |
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Most diffused light
Poly (2 layer) Fiberglass Glass Polycarbonate |
Fiberglass |
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Most flammable
Poly (2 layer) Fiberglass Glass Polycarbonate |
Fiberglass |
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May be corrugated for strength
Poly (2 layer) Fiberglass Glass Polycarbonate |
Polycarbonate |
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May be single or double layered
Poly (2 layer) Fiberglass Glass Polycarbonate |
Poly (2layer) |
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Light transmission decreases with age
Poly (2 layer) Fiberglass Glass Polycarbonate |
Poly (2layer) |
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Requires the most frequent replacement
Poly (2 layer) Fiberglass Glass Polycarbonate |
Poly (2layer) |
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Greater weight requiring a stronger structure
Poly (2 layer) Fiberglass Glass Polycarbonate |
Glass |
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What type of benching.... Allows the most production area |
Moveable benches |
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What type of benching.... Has Least production area in a GH |
Conventional longitude benches |
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After soil sterilization, there's a chance of toxicity from |
Ammonia |
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Soil is commonly sterilized at what temp |
100 degrees C |
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The most common way to eliminate pathogens in a soil is? |
Pasteurization |
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Soil sterilization kills what amount of soil organisms? |
All |
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What is most likely to be found in a peat-lite mix? (Raise ph) |
Dolomite lime |
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True or false ? The main reason for adding inorganics to fertilizer is to increase CEC |
False |
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Over time perlite is more subject to be compacted in a mix than vermiculite |
. |
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True or false ? Sand has a lower CEC than vermiculite |
True |
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True or false ? Bark provides better areation/drainage the sawdust |
True |
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True or false ? Perlite is used to increase areation and drainage in soil mix |
True |
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True or false ? Peat moss is acidic |
True |
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True or false ? Peat light mix contains N &P |
False |
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True or false ? Peat moss has good areation and drainage |
False |
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What depth of container does soil drain better in? |
Deep |
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Has a greater chance of containing contaminates Peat lite mix or topsoil? |
Topsoil |
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Lighter to handle Peat lite mix or topsoil? |
Peat lite mix |
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Has less chance of containing pathogens Peat lite mix or topsoil? |
Peat lite mix |
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1 ppm N is defined as |
1 gram of N in a million grams of H2O |
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Liquid feeding gives more or less even nutrient levels? |
More |
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What elements are almost always liquid fed to GH crops grown in a soil- less mix? |
Ñ and K |
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1:100 or 1:200 has greater volume of stock solution |
1:100 |
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Positive displacement dilutors are more or less accurate than venturi ones? |
More |
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What compound has the highest salt index |
Calcium nitrate |
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Azalea would start to show a 10% reduction in growth at a conductivity of |
1 |
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Soil conductivity gives us a measure of soil.. |
Salts |
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Tensiometers are used to measure |
Soil moisture |
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Calcium nitrate and mg sulphate may form insoluble precipitates when mixed in HIGH or LOW concentrations? |
High |
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Given that we have a 100:1 injector, and we want 2gms of fertilizer per liter of water in the final working solution, what should be the concentration (gm/liter) of stock solution? |
200 |
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Trickle irrigation is more feasible with SMALLER OR LARGER containers? |
Larger |
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In a trickle irrigation system, a threaded end Cap is attached to the end of the row header so that... |
The row header can be flushed |
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True or false? All trickle rubes should be the same length? |
True |
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True or false? A tensiometer has a less suction at saturation than at wilting Point? |
True |
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True or false? If possible avoid leaching with each watering |
False |
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True or false? The surface of potted plants should always be kept Moist |
False |
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True or false? A trickle system is best suited to a bench of mixed plants? |
False |
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When buds are removed, those remains INCREASE OR DECREASE in size? |
Increase |
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All ray flowers with incurved petals; large flowers grown as standards Incurve--Spider--Pom-pom--Daisy -- or decorative? |
Incurve |
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Tubular petals that may be hooked at the end of a petal? Incurve--Spider--Pom-pom--Daisy -- or decorative |
Spider |
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All ray flowers, with short petals; small,ball shaped heads Incurve--Spider--Pom-pom--Daisy -- or decorative |
Pom-pom |
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Yellow disc flowers; ray flowers with flattened petals Incurve--Spider--Pom-pom--Daisy -- or decorative |
Daisy |
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Flowers are both incurved and reflexes Incurve--Spider--Pom-pom--Daisy -- or decorative |
Decorative |
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An 8 week chrysanthemum will flower when.. |
8 weeks after the start of the short day period |
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The night tempature for chrysanthemums is INCREASED OR DECREASED through the cropping season? |
Decreased |
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The growth regulator used on the chrysanthemum to create a compact plant is ... |
Auxin |
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S.B.R. OR C.B.R OR STANDARD? |
C.B.R Several flowers per break |
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S.B.R OR C.B.R OR STANDARD |
S.B.R |
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S.B.R OR C.B.R OR STANDARD |
S.B.R 1 flower per break |
