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  Information புதியவர் (பதிவு செய்து கொள்ளாதவர்)

  Sinhala Northen Part of Sri Lanka (The Dry Zone area) Early Settlements The first extensive Sinhalese settlements were along rivers in the dry northern zone of the island. Because early agricultural activity-- primarily the cultivation of wet rice-- was dependent on unreliable monsoon rains, the Sinhalese constructed canals, channels, water-storage tanks, and reservoirs to provide an elaborate irrigation system to counter the risks posed by periodic drought. Such early attempts at engineering reveal the brilliant understanding these ancient people had of hydraulic principles and trigonometry. The discovery of the principle of the valve tower, or valve pit, for regulating the escape of water is credited to Sinhalese ingenuity more than 2,000 years ago. By the first century A.D, several large-scale irrigation works had been completed. The mastery of hydraulic engineering and irrigated agriculture facilitated the concentration of large numbers of people in the northern dry zone, where early settlements appeared to be under the control of semi-independent rulers. In time, the mechanisms for political control became more refined, and the city-state of Anuradhapura emerged and attempted to gain sovereignty over the entire island. The state-sponsored flowering of Buddhist art and architecture and the construction of complex and extensive hydraulic works exemplify what is known as Sri Lanka's classical age, which roughly parallels the period between the rise and fall of Anuradhapura (from ca. 200 B.C. to ca. A.D. 993).

  18 years ago | பதிலளி | hide comment
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  Information புதியவர் (பதிவு செய்து கொள்ளாதவர்)

  CURRENT STATUS OF CASHEW PRODUCTION http://www.fao.org/docrep/005/ac451e/ac451e08.htm

  18 years ago | பதிலளி | hide comment