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Wind chill, fleece etc.
How much does wind chill effect plants? I assume that because it's a
calculated figure intended to give humans some idea of how cold it feels, then an air temperature of say 2C with a wind chill of say -3C doesn't actually mean plants will freeze (assuming they would anyway at sub-zero temperatures). But I also assume that, because of the effect of the wind, plants will actually reach that 2C much quicker than they would do in still air, and that their own individual microclimate within the 'envelope' of the plant would be greatly reduced or literally blown away. Which brings me on to fleece. In still air (or almost so) I assume fleece works by preventing loss of heat by radiation and thus prevents a ground frost settling on the plant. In windy conditions, I assume that the fleece goes some way to preserving the microclimate within the envelope of the plant (see above) and so provides some insulation and also prevents desiccation to some degree. Is there a rule-of-thumb as to how much frost protection can be achieved with fleece and under what conditions? I assume it depends to some degree on wind strength. Am I right? Any views or experiences? -- Chris E-mail: christopher[dot]hogg[at]virgin[dot]net |
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