Agriculture is the single most important sector of Bangladesh’s economy. About
84% of the 145 millions people of Bangladesh are directly or indirectly engaged in
a wide range of agricultural activities (Rahman 2004). Crop is the main sector of
agriculture and within the crop sector, rice dominates with an average of 71% share
(Food and Agriculture Organization 2004). High Yield Variety (HYV) Boro rice
is the highest contributors of total rice supply in Bangladesh. Out of 27.83 million
metric tons total rice production in 2007–2008, 16.9 Million metric ton was from
Boro rice. Boro rice, grown during dry season (Jan to May) and cultivated under
irrigation scheme, is the main cultivated crop in northern as well as other parts
of the country. The rapid growth of minor irrigation equipments has inspired the
farmers to make a progressive shift from high-risk, monsoon dependent agriculture
to low-risk, irrigation-based agriculturBangladesh is one of the most vulnerable countries in the world to climate
change (Intergovernmental Panel on Climate Change 2007). Hydrologic changes
are the most significant potential impacts of global climate change in Bangladesh
(Organization for Economic Co-operation and Development 2003). It has been
predicted that due to climate change, there will be a steady increase in temperature
and change in rainfall pattern of Bangladesh (Intergovernmental Panel on Climate
Change 2007). Higher evapotranspiration due to temperature rise will demand
higher amount of water for irrigation. At the same time the higher temperature
will change the crop physiology and shorten the crop growth period which in turn
will reduce the irrigation days. These contradictory phenomena will change the total
irrigation water demand which is required to quantify for long-term water resources
planning and management.e. The average area of Boro rice has increased
substantially in last 20 years (Akter and Jaim 2002). The population of Bangladesh
is growing by two million every year and may increase by another 24 millions over
the next 12 years (Bangladesh Bureau of Statistics 2003). Bangladesh will require
about 4.5 million tons of more rice to feed the increased population by 2020. A large
portion of this increased production is expected to come from expansion of irrigation
based Boro rice cultivation (Wahid et al. 2007).
Agriculture is the single most important sector of Bangladesh’s economy. About84% of the 145 millions people of Bangladesh are directly or indirectly engaged ina wide range of agricultural activities (Rahman 2004). Crop is the main sector ofagriculture and within the crop sector, rice dominates with an average of 71% share(Food and Agriculture Organization 2004). High Yield Variety (HYV) Boro riceis the highest contributors of total rice supply in Bangladesh. Out of 27.83 millionmetric tons total rice production in 2007–2008, 16.9 Million metric ton was fromBoro rice. Boro rice, grown during dry season (Jan to May) and cultivated underirrigation scheme, is the main cultivated crop in northern as well as other partsof the country. The rapid growth of minor irrigation equipments has inspired thefarmers to make a progressive shift from high-risk, monsoon dependent agricultureto low-risk, irrigation-based agriculturBangladesh is one of the most vulnerable countries in the world to climatechange (Intergovernmental Panel on Climate Change 2007). Hydrologic changesare the most significant potential impacts of global climate change in Bangladesh(Organization for Economic Co-operation and Development 2003). It has beenpredicted that due to climate change, there will be a steady increase in temperatureand change in rainfall pattern of Bangladesh (Intergovernmental Panel on ClimateChange 2007). Higher evapotranspiration due to temperature rise will demandhigher amount of water for irrigation. At the same time the higher temperaturewill change the crop physiology and shorten the crop growth period which in turnwill reduce the irrigation days. These contradictory phenomena will change the totalirrigation water demand which is required to quantify for long-term water resourcesplanning and management.e. The average area of Boro rice has increasedsubstantially in last 20 years (Akter and Jaim 2002). The population of Bangladeshis growing by two million every year and may increase by another 24 millions overthe next 12 years (Bangladesh Bureau of Statistics 2003). Bangladesh will requireabout 4.5 million tons of more rice to feed the increased population by 2020. A largeportion of this increased production is expected to come from expansion of irrigationbased Boro rice cultivation (Wahid et al. 2007).
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