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lab quiz 1

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43 Terms

1
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intermittent mist
cools the atmosphere and covers leaf surface to reduce plant/seed water loss
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how does misting reduce leaf transpiration
reduction in leaf temperature and maintains high humidity conditions at the leaf surface
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dry fog size
10-20 microns
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wet fog size
20-30 microns
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mist size
30-60 microns
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spray size
60 microns
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how do small orifice nozzles work
liquid is forced through tiny orifice at high pressure breaking it up into small droplets
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how do impingement/deflection type nozzles work
solid stream of fluid hits pin and breaks the fluid into fine droplets where it then disperses
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misty mist
deflection; volume rated at .17 gallons per minute at 36 psi and .22 gallons at 73 psi - 6ft spray pattern
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pin perfect
deflection; .80-1.27 gallons per minute depending on pressure, 10 ft spray pattern
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phytomist
deflection; most efficient at 40-50 psi
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electronic leaf with electrode
as water evaporates sensor switches to open position triggering irrigation
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electronic leaf with balance
water weights leaf down which triggers sensors turning off solenoid, water evaporates and activates solenoid triggering irrigation
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static timer
timers set manually to run for predetermined amount of time
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Pb/bulk density
dry weight of substrate per unit of volume in g/cm3
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total porosity/E
water added to substrate/total container volume x 100
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Pv / volumetric moisture content
percent total porosity - percent air space = percent water holding capacity
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Ea / air filled porosity
drained water/total container volume x 100
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where do you apply auxin on plant
basal 1/4 to 1/2 in - dilute soak basal 1 in
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how long to liquid quick dip
5-15 seconds
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softwood/herbaceous iba concentration
500-1,250 ppm
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semi-hardwood iba dip ppm
1,000-5,000 ppm
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hardwood iba dip ppm
1,000-5,000 ppm
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hormodin 1 ppm
1,000 ppm
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hormodin 2 ppm
3,000 ppm
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hormodin 3 ppm
8,000 ppm
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how far to space cuttings
2-4in
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nodal cut
basal cut below node - helps prevent fungal rot and increases root production
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internodal cut
reduces fungal growth in wide pithed or hollow pithed species
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herbaceous cuttings
3-5in but can vary depending on species - cut basal end at an angle, keep foliage off substrate and keep wet
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terminal cutting
contains a terminal bud (top of plant)
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medial cutting
no terminal bud
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single eye cutting
alternate leafed plant
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double-eye cutting
opposite leaf plant
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split node cutting
splitting of the node on an opposite leaf plant
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higher pressure results in
smaller droplet size
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most efficient height of mist nozzle
short
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most efficient nozzle head
pin perfect
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percent porosity bmp
50-85%
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percent air space bmp
10-30%
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water holding capacity bmp
45-65%
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sand had
too little air space and too much water holding
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best rooting medium
promix or verm