Remember that during the day the earth absorbs heat from the sun, and at night it radiates its heat back into the atmosphere. The more moisture in the air at night, the less likelihood that frost will occur that night. Commercial farmers often irrigate crops when frost is predicted. They are, in fact, artificially raising the dew point to decrease the likelihood of frost.
There are ways we can minimize freeze and frost impacts in the garden. Siting is the first consideration. Gardens on slopes or high ground and southern exposures are less affected by frost and freeze. Cold air is heavy and flows downhill to form "frost pockets" in low-lying areas such as valleys or hollows. These dates tell you when it is safe to begin planting, pruning and other activities.
The dates are compiled by the National Climatic Data Center and are based on historical weather data from that area over a year period. Ann Auerbach is a Rutgers master gardener in Camden County. Send your lawn and garden questions to njgarden camdencounty. A Rutgers master gardener will respond to all questions received. Master gardeners are there from 9 a. Facebook Twitter Email.
Understand frost, freeze and dew point. In the other can put only crushed ice and cool tap water. Fill the can about half way full of ice and then put just enough tap water in the can to cover the ice. Note the frost forming on the outside of the can with the ice and salt mixture. Compare this with the liquid moisture on the outside of the can which contains ice only. Warm, humid air is full of moisture that can condense during calm, cool nights. Weather conditions can also influence an area's dew point.
Strong winds, for instance, mix different layers of air, containing different amounts of water vapor. This reduces the atmosphere's ability to form dew. Cold weather can also prevent the formation of dew. At a frost point, water vapor does not condense. It sublimate s, or changes directly from a gas to a solid. Moisture changes from water vapor to ice. Dew is most likely to form at night, as temperatures drop and objects cool. However, dew can form whenever a dew point is reached.
Although warm, humid areas commonly experience heavy dew, dew does not form in amounts people could to collect as a water source. Still, several organizations are working to develop technology that will allow them to harvest dew as a freshwater resource.
They hope that foil condenser s will help meet the water needs of arid areas. The most successful of these condensers have been put to work in Kutch, India, where hundreds of liters of water can be harvest ed every night at certain times of the year.
Dew collects on a red rose. Photograph by James L. Stanfield, National Geographic. Media Credits The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit. Media If a media asset is downloadable, a download button appears in the corner of the media viewer.
Text Text on this page is printable and can be used according to our Terms of Service. Interactives Any interactives on this page can only be played while you are visiting our website. Related Resources.
0コメント