Скачать или смотреть 5 Tips To Predict Frost (Replay)

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WHAT IS FROST?
“Frost” refers to the layer of ice crystals that form when water vapor on plant matter condenses and freezes without first becoming dew.
A light frost occurs when the nighttime temperature drops to at or just below 32°F (0°C).
A hard freeze is a period of at least four consecutive hours of air temperatures that are below 28°F (-2°C).
Many plants can survive a brief frost, but very few can survive a hard freeze.
FROST ADVISORY VS. FREEZE WARNING
As with other significant weather events, meteorologists will often issue a “warning” or an “advisory,” depending on the likelihood of the event happening and its severity. According to the National Weather Service, the warning terms for frosts and freezes are defined as follows:
**Frost Advisory: Issued when minimum temperatures are expected to be between 33° and 36°F (0.5° and 2°C). Skies are generally clear and winds light.
**Freeze Watch: Issued when minimum temperatures are expected to be 32°F (0°C) or less within the next 24 to 36 hours.
**Freeze Warning: Issued when minimum temperatures are imminently expected to be 32°F (0°C) or less.
**Hard Freeze Warning: Issued when minimum temperatures are expected to be 28°F (-2°C) or less.
WHAT TEMPERATURES CAUSE FROST DAMAGE? (SEE THE TABLE DISPLAYED IN THE VIDEO AT 6:53 IN THE VIDEO)
For many vegetables, frost causes damage and crop failure. But also there are other vegetables which actually benefit from a frost. The flavor of broccoli, for instance, actually improves if the plant has experienced a frost, and carrots get sweeter as the temperature drops.
How low can you go? The temperatures shown in the graphic below tell you when the frost will cause damage to the respective vegetable.
HOW TO PROTECT PLANTS FROM FROST
Frost can hit in spring or fall in most areas. Generally, covering plants to create a temporary pocket of warmer air is the best way to protect them.
Keep an eye on the weather forecast. If it looks like temperatures are going to drop, get ready to protect tender plants.
Make use of season extenders like row covers, cold frames, or cloches to protect tender plants, such as seedlings or warm-weather veggies. Row covers or garden fleece can be used to help create a warmer environment beneath them. You’ll need to use posts, bamboo, or flexible PVC piping to create space for the plants to grow, then drape landscape fabric or plastic over the frame; weigh down the edges with rocks or bricks or pegs so the covers do not blow away. To protect young plants from frost, use 2-liter soda bottles cut in half as cloches.
It’s best to have all covers in place well before sunset. Drape loosely to allow for air circulation. Before you cover the plants in the late afternoon or early evening, water your plants lightly.
Remove any covers by mid-morning so that plants can get full exposure to the warming sunlight.


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