Irrigatiion

Irrigation

It is unknown who first irrigated his crops with water brought specially from a nearby river,but archeological evidence suggests that,where ever farming began to take place,irrigation soon followed.There is evidence of irrigation from around 6000 B.C.E in summer in Mesopotamia, and also on ancient Egyptian farms near the Nile. Some 2000 years later,irrigation occurred in Geokysur in South Russia,and in the Zana valley in the Andes Mountains of Peru. By 3000 B.C.E the same techniques were used by the Indus valley civilization in what is now Pakistan.

When,at around 6000 B.C.E, the first farmers in Mesopotamia planted their crops of barley,wheat and other plants near the Tigris or Euphrates rivers,they relied on rain,the occasional flood,and the ability of the soil to hold water to ensure that their crops grew from seed to harvest. Water could be carried in buckets from the river,but if the rain stopped and there was a lengthy drought,the crops would die.

The problem of over-reliance on natural water supplies was solved by creating artificial means of bringing the water to the fields. The water was either diverted from a major river through canals and drainage ditches that flowed alongside the fields,or it was stored in the reservoirs and ponds that were refilled in times of flood,and distributed from these. The effect of this irrigation was to extend the area of fertile land from just a narrow strip on either side of a river to a wide band that could be several miles across. Having more irrigated land resulted in more crops, and thus the ability to support a rising population.

Comments

Facts about DEATH

DEATH➽ Like birth, death too is a part of our life. When we think about it, our mind conjures up images of cemeteries and old people. But death can also come to younger people, through illness or accidents. The way bereavement is handled differs from person to person, and from culture to culture. Many also argue in favour of euthanasia, or mercy,killing,in a situation where a person is in a permanent state of coma or in extreme pain and agony due to an incurable disease. What happens when people become old ❓ People get wrinkles on the skin and grey hair when they grew old.The actual ageing process takes place inside the body. The efficiency of the body cells goes down over the years.At some point of time,muscles start shrinking,sense organs like eye and ear grow weak,and the body's general energy level dips.Many old people appear confused;others remain alert till the end. In some cultures,old people take leave ...

Antilock Braking System (ABS)

Antilock Braking System (ABS) The Antilock Braking System (ABS) was designed by Frenchman Gabriel Voisin (1880-1973),originally as a way of preventing planes from swerving on landing. He first installed a system to keep airplane brakes from locking up 1920. Several decades later, after limited success with similar systems in cars a breakthrough came in 1978, when Mercedes-Benz announced the installation of electronic ABS in its S-Class car. Theoretically, ABS can stop a serious car accident from occurring by allowing a driver to maintain control in slippery conditions or during an emergency stop. On an icy road, a car's wheels can lock up, sending the vehicle to spin. In cold cars that did not have ABS, drivers had to try to pump the brakes to prevent this. With ABS, the brakes are automatically pumped-the system senses the change in condition and alters the brake fluid pressure accordin...

Drugs...

Drugs➽ Earlier,the term 'drugs' referred to drie d parts of plants that had an intoxicant effect and were used for medicinal purpose. Today, the term also includes those substances which induce a state of dreamy forgetfulness and are thus often used by people who want to temporarily escape from reality. Soft drugs, such as alcohol or tobacco, which are found in cigarettes or cigars, can be purchased anywhere; however, they too can be injurious to health if taken in excess. In contrast, hard drugs, such as Heroin or Cocaine are prohibited. But they are still smuggled across borders from other countries where they are produced. What happens when one takes hard Drugs ❓ Hard drugs, such as heroin or LSD,often lead to addiction the very first time they are taken. Once the d...

Technical Travelling and health

Search This Blog