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10 Cards in this Set
- Front
- Back
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HOW TO PREVENT A RADIATIONAL FREEZE OR FROST
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1) Decrease rate of radiational cooling
2) Increase air temperature |
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HOW TO PREVENT A RADIATIONAL FREEZE OR FROST
1) Decrease rate of radiational cooling |
a) hot caps or plastic tents
b) mulches c) foams d) fog or water vapor e) smoke |
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HOW TO PREVENT A RADIATIONAL FREEZE OR FROST
2) Increase air temperature |
a) eliminate temperature inversion:
1) wind machines 2) helicopters b) irrigation 1) flood irrigation; water is warmer and stabilizes temperature (due to high specific heat) 2) overhead irrigation; constant temperature at 32 oF when liquid/ice present c) oil burners or smudge pots |
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HOW TO PREVENT ADVECTIVE FREEZE DAMAGE
1) Plant selection |
the ideal method, because then no other method is needed
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HOW TO PREVENT ADVECTIVE FREEZE DAMAGE
2) Radiational freeze methods |
some are moderately effective for mild, short freezes.
a) Insulate: mulch, foam, hot caps (NOT fog or smoke) b) Increase air temperature: irrigation, oil burners or smudge pots if mild and little wind c) CANNOT USE: fog, smoke or eliminate temperature inversion |
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HOW TO PREVENT ADVECTIVE FREEZE DAMAGE
3) Site selection |
avoid north side of hills, buildings, etc.; avoid low areas, valleys, etc.
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HOW TO PREVENT ADVECTIVE FREEZE DAMAGE
4) Delay development in spring |
avoids damage to new spring growth and flower buds from late spring frost.
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HOW TO PREVENT ADVECTIVE FREEZE DAMAGE
5) Harden-off or cold acclimation in fall |
is a normal part of dormancy and preparation of the plant for for winter.
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Harden-off or cold acclimation in fall: Naturally Triggered By:
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Naturally triggered by:
a) short days b) cool temperatures c) cold temperatures |
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Harden-off or cold acclimation in fall: Allow to occur naturally by observing the following
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1) Do not encourage growth:
a) decrease fertilization b) decrease watering c) avoid pruning 2) Avoid stress a) insect, disease or physical damage b) poor nutrition and nutrient deficiencies c) too heavy fruit load |
