Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Historic Centre of Bukhara' has mentioned 'Irrigation' in the following places:
Occurrence Sentence Text Source
The water was important in the hot, dry climate of Central Asia, so from ancient times, irrigation farming was developed.
However, the heavy use of agrochemicals during the era under the Soviet Union, diversion of huge amounts of irrigation water from the two rivers that feed Uzbekistan, and the chronic lack of water treatment plants, have caused health and environmental problems on an enormous scale.