To study the impact of climate change on irrigation water demand in the study area,
first the increased temperature is used to compute the change in Boro rice phenology
using degree-day method. The length of growth stages of Boro rice modeled by
Mahmood (1997) for northern and northwestern Bangladesh is taken as the base
length. Temperature projected by the climatic models during the months of January
to May in the year 2025, 2050, 2075 and 2100 are used to compute the change
of growing stages of Boro rice in those years. The modeled changed of Boro rice
phenology due to the rise of temperature is given in Table 5. The result shows that
the total growing period of Boro rice will shortened to 140 days in 2025, 136 days in
2050, 133 days in 2075 and 130 days in 2100. This finding collaborates with the finding
of Karim et al. (1999) that the shortening of Boro rice growing period by 2 to 12 days.
The irrigation days will be shortened to 121 days in 2025, 117 days in 2050, 114 days
in 2075, and 112 days in 2100.
To study the impact of climate change on irrigation water demand in the study area,first the increased temperature is used to compute the change in Boro rice phenologyusing degree-day method. The length of growth stages of Boro rice modeled byMahmood (1997) for northern and northwestern Bangladesh is taken as the baselength. Temperature projected by the climatic models during the months of Januaryto May in the year 2025, 2050, 2075 and 2100 are used to compute the changeof growing stages of Boro rice in those years. The modeled changed of Boro ricephenology due to the rise of temperature is given in Table 5. The result shows thatthe total growing period of Boro rice will shortened to 140 days in 2025, 136 days in2050, 133 days in 2075 and 130 days in 2100. This finding collaborates with the findingof Karim et al. (1999) that the shortening of Boro rice growing period by 2 to 12 days.The irrigation days will be shortened to 121 days in 2025, 117 days in 2050, 114 daysin 2075, and 112 days in 2100.
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