Impact of rainfall and water use to produce rice in the coastal land of the Red river delta: A case study in Kim Son district, Ninh Binh province, Viet Nam
2011
Nguyen Van Dung, Nguyen Tat Canh, Ngo Thanh Son, Ngo Thi Dung, Nguyen Thi Giang, Vu Thi Xuan
In Vietnam, there are 81% (eighty one percents) of surface water used for agriculture, 11% (eleven percents) for aquaculture, 5% (five percents) for the industry and 3% (three percents) for domestic use. Due to climate change as well as economic development has been made coastal temperatures higher 0.80C than the average temperature in recent years, besides the monthly average rainfall decreased to 14.1mm of per month compared with same period of previous years. Above reasons lead to make fresh water from upstream run down fewer and the sea water has invaded deeply into the estuary with a high salt concentration to 6.03%o 'b 2.08. Therefore, that's why it is impossible to open gate to irrigate teller ring during the spring. There are 1500 hectares of rice area in Kim Son district was dried and salinity, included 180 hectares of rice lost completely and 40 hectares of land must have replant 1 or 3 times by farmers but the yield was only 1.3 to 1.8 tons/ha which reduced 52.47% to 70.31% compared with yield of un-salt land meanwhile extra costs for purchasing of young rice and others increased variedly from 2.2 to 17.0 million VND per hectare.
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