Droughts Drought is a natural phenomenon that occurs when there is a long absence of precipitation combined with high evaporation, which causes desiccation. Drought. Consequences of drought Download presentation on drought

Drought. Drought is a long (from several weeks to two to three months) period of stable weather with high (for a given area) air temperatures and little precipitation (rain), as a result of which soil moisture reserves decrease and oppression and death of cultivated plants occurs. In mid-latitudes, droughts are most often observed in the steppe zone, less often in the forest-steppe zone: 2-3 times a century droughts occur even in the forest zone. In Central Russia in 1972, 2002 and 2010, due to prolonged heat and drought, numerous forest and peat fires, which led to smoke in Moscow and many other cities and numerous health problems among people. Depending on the time of year, spring, summer and autumn droughts are distinguished. Spring droughts are especially dangerous for early grain crops; summer ones cause severe damage to both early and late grain and other annual crops, as well as fruit plants; autumn ones are dangerous for winter crop seedlings. The most destructive are spring-summer and summer-autumn droughts.

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Drought - long (from several
weeks to two to three months) period
stable weather with high
air temperatures and low
amount of precipitation (rain), in
resulting in a decrease in moisture reserves

soil and oppression and death arise
cultivated plants.
Depending on the time of year, there are spring,
summer and autumn droughts.
spring droughts are especially dangerous for early
grain crops;
summer ones cause great harm to both early and
late grains and other annual crops,
as well as fruit plants;

autumn ones are dangerous for winter crop seedlings.
The most destructive are spring-summer and summer-autumn droughts.
In mid-latitudes, droughts are most common
observed in the steppe zone, less often in
not applicable to regions with rainless summers
and extremely low rainfall, where
agriculture is possible only with
artificial irrigation (for example, deserts
Sahara, Gobi and others).
Droughts are common in subtropical
belt and in the subequatorial zone, where it rains
only occur during the wet season. In order to
raising global awareness
public the UN established a worldwide
day to combat desertification and drought.

When most people hear the word "drought"
it hardly seems like anything special
scary. But prolonged droughts
capable of causing harm comparable to
worst disasters, cause crop failure
and hunger. Farmers are afraid of them even in our
days, and even a hundred years ago worse words for them
simply did not exist. What droughts?
in the history of mankind were considered
most terrible?

Drought in Illinois. 1988−89. One
one of the worst droughts in US history,
causing damage worth 60 billion
dollars. Accompanied by mass
death of corn and monstrous
fires that led to death
thousands of people.

Drought in Spain. year 2014. - one of
severe disasters that the country
experienced over the last 150 years.
Some experts predicted
that Spain can fully
lose supplies drinking water, A
the world was facing severe shortages
olive oil.

The Great Drought in Western Australia.
1829 This disaster did not spare
not a single Australian farmer
destroying the entire
grown crop. People were
forced to leave the Western
Australia in search of a new place for
life.

Drought in the USA. 1983 Late
spring in the midwest area and
The Great Plains that year caused
sudden increase in temperature
in the summer - she held steady
at 40 degrees for several months
contract. He died from the heat
a lot of people, let alone
crops.

Stops during drought
water supply to the root system
plants, moisture consumption exceeds it
inflow is critically decreasing
water saturation of plant tissues,
normal conditions are violated
growth.

Drought Drought is a prolonged and significant lack of rain, often at elevated temperatures and low air humidity, as a result of which moisture reserves in the soil dry up, which leads to a decrease or loss of the crop. The onset of drought is usually associated with the establishment of an anticyclone. The abundance of solar heat and dry air create increased evaporation (atmospheric drought), and soil moisture reserves are depleted without replenishment by rain (soil drought). During drought, the flow of water into plants through the root systems is hampered, the moisture consumption for transpiration begins to exceed its influx from the soil, the water saturation of tissues decreases, and the normal conditions of photosynthesis and carbon nutrition are disrupted.

Drought Depending on the time of year, there are spring, summer and autumn droughts. spring droughts are especially dangerous for early grain crops; summer ones cause severe damage to both early and late grain and other annual crops, as well as fruit plants; autumn ones are dangerous for winter crop seedlings. The most destructive are spring-summer and summer-autumn droughts. Most often, droughts are observed in the steppe zone, less often in the forest-steppe zone: 2-3 times a century droughts occur even in the forest zone. The concept of drought is not applicable to areas with rainless summers and extremely low precipitation, where agriculture is possible only with artificial irrigation (for example, the Sahara, Gobi and others deserts). In order to raise global awareness, the UN established World Day to Combat Desertification and Drought.

Occurrence The onset of drought is usually associated with the establishment of a sedentary high anticyclone. The abundance of solar heat and gradually decreasing air humidity create increased evaporation (atmospheric drought), and therefore the reserves of soil moisture are depleted without replenishment by rain (soil drought). Gradually, as soil drought intensifies, ponds, rivers, lakes, and springs dry up—a hydrological drought begins. During drought, the flow of water into plants through the root systems is hampered, the moisture consumption for transpiration begins to exceed its influx from the soil, the water saturation of tissues decreases, and the normal conditions of photosynthesis and carbon nutrition are disrupted.

Differences Depending on the time of year, spring, summer and autumn droughts are distinguished. spring droughts are especially dangerous for early grain crops; summer ones cause severe damage to both early and late grain and other annual crops, as well as fruit plants; autumn ones are dangerous for winter crop seedlings. The most destructive are spring-summer and summer-autumn droughts.

Regions In mid-latitudes, droughts are most often observed in the steppe zone, less often in the forest-steppe zone: 2-3 times a century droughts occur even in the forest zone. The concept of drought is not applicable to regions with rainless summers and extremely low precipitation, where agriculture is possible only with artificial irrigation (for example, the Sahara, Gobi and others deserts). Droughts are common in the subtropical zone and in the subequatorial zone, where rain occurs only during the wet season. In order to raise global awareness, the UN established World Day to Combat Desertification and Drought.