The cause of the dew is a natural natural process in which atmosphere, hydrosphere and earth's surface is constantly exchanging moisture. It arises from the fumes of their movements in the atmosphere, subsequent condensation in the form of periodic deposition of different precipitation and runoff back to the oceans. This process is called the great or the global water cycle in nature. Along with him are two more small cycle: oceanic and continental. The first is directly over the ocean and like a world cycle is a continuous process of movement of moisture. In the same way is the continental water cycle, but only over land areas. It should be noted that in this process, the ocean loses more moisture than it receives. On the mainland the situation is the opposite way: much more precipitation falls than evaporates. But in the end, all they are ever fallen on the land, back into the ocean.Among all types of precipitation, which are formed as a result of the water cycle, dew, perhaps the most surprising. On hot summer days from the surface of lakes, rivers, streams, and plant and soil evaporation of moisture. At night, the air temperature decreases and can reach values, which is enough for saturation of water vapor. This condition is also called the dew point. There comes a time when couples can no longer stay at this point and deposited on the ground surface, plant leaves, etc. in the form of water drops. But as soon as the first rays appear above the horizon, the dew immediately begin to evaporate. So if you want to see this wonderful phenomenon of nature, it should be done at dawn.Since ancient times, people washed by the dew of herbs, and trees, and walked through it. Dew, absorbing the healing power of plants, sparking in the morning sun, gave health and joy to man.
Advice 2: Why dew appears in the morning
In the basis of the occurrence of many natural processes and phenomena – rain, snow, frost, fog, dew – lay is an amazing physical property of water. Dew is water droplets that appear on the vegetation on summer nights and disappearing under the sunlight in the morning. There is a figure of speech: "had the dew". Indeed, to some extent, Rosa – a form of precipitation. However, it does not fall out as, for example, rain or snow from clouds, and, strictly speaking, this is not exactly, and not only atmospheric water. And what then?
The process of moisture evaporation from any water surface is constant. A certain percentage of the water evaporates from the soil. Under the action of sunlight, evaporation is more intense. Microscopic droplets form a vapor, transparent streams rising above the ground. Air masses always contain water vapor, but warm air it anymore.
But evening comes, the sun sets and the earth's surface slowly begins to cool. If the sky is starry and cloudless, the earth surface cools faster. Warm layers of air that contains water vapor into contact with the objects, giving quick heat and also cold. Seen – the dew is not formed on earth, as it retains daytime heat.
Gradually adjacent to the land air masses are cooled to a temperature called the dew point. At this temperature, the vapor becomes saturated and condenseries on cold objects the grass and leaves. The formation of dew contributes to the breeze, carrying air masses have to repay a portion of its water vapor and brings new, rich moisture. And so early in the morning on the grass and the leaves of the trees appear drops of dew.
Water vapor contained in the air always, but its amount in different parts of the earth differently. Accordingly, a variety and intensity of dew formation. For example, in deserts it falls quite a bit, but it is very important, as is virtually the only source of water for all living things.
Most intensively the process of dew formation occurs in the tropics. High daytime temperatures in these areas is highly conducive to evaporation, so the near-earth layers of the air contain large amounts of water vapor. In hot Equatorial areas day and night almost the same time, so during the night the earth's surface manages to be quite cool. Especially fast heat gives off lush tropical vegetation. All these factors lead to intensive condensation of water vapor.
Noticed, however, that the vegetation of the dew in the morning is always more than non-living objects – painted benches, roofs, rocks, fences, etc., Scientists have found that only a small portion of moisture appearing in the early morning on the grass and the leaves of the plants is condensate. A large part of the morning dew – the result of a process of smorreale, ie zamorochena. Through tiny stomata from the body plants on the surface are droplets of water coming from the roots. Therefore, the plant redeems himself in the heat of summer from the scorching rays of the sun.
Advice 3: Powdery mildew on currant
Powdery mildew on currant manifests as a whitish gray coating on young shoots, leaves and even berries. And if time does not take action, the Bush dies. There are several ways, including folk, anti-mildew.
What is powdery mildew of currant
Powdery mildew is a fungal disease, caused by the fungus parasite, which affects not only red and black currants, and gooseberries. First, the shoots and the leaves appear whitish plaque, he soon becomes brown and deformed shoots, leaves curl, lose color and gradually fade. Amazed and berries, they are still green fall off. The fungus overwinters in plant debris and plant in the spring it starts to produce spores that infect close-growing shrubs. Especially, the disease spreads in warm wet weather. And if left untreated currants, it dies.
Ways to combat mildew
Get rid of powdery mildew you can, if you combine the methods of treatment and prevention. In the fall be sure to trim the bushes, rake the fallen leaves and burn it all. Additionally, in the fall or early spring process the currants and the ground under it 5% solution of copper sulfate.
In the summer should spray the bushes, at this time, fungicides, for example, there are such effective drugs as "Topaz", "Thiovit jet Kolodny sulfur, etc.
Also a good helping of traditional methods. These include spraying the affected currants with a solution of soap with the addition of copper sulfate ( 10 liters of water 100 grams of soap and 5 g sulfate), infusion of wood ash with soap ( for 10 l water 1 kg of ash and 100 grams of soap), infusion of manure or rotted hay. The last recipe, you can cook it this way. The capacity to put one-third rotted hay or manure, to condense, to fill with water and allow to infuse for 3-4 days. To 1 part infusion take 10 parts of water, add a little soap and sprayed currants in the morning or evening.
To avoid this disease, grow on your plot of varieties of currant, resistant to powdery mildew. This "Dove", "Agat", "Belarusian sweet", "Bagheera", "Fancy", "Black pearl" etc.