ESTIMATION OF CROP WATER REQUIREMENT FOR BORO RICE IN BANDARBAN, BANGLADESH BASED ON CROPWAT 8.0 ...

Crop water requirements (CWR) are important in determining which irrigation plants and plant structures to use in specific areas, such as Bandarban, Bangladesh, to ensure efficient water use and higher irrigation practises. The FAO CROPWAT model was used to estimate irrigation needs and irrigation of boro rice (watered during the dry season) in the Bandarban region of Bangladesh. For boro rice, three decades (I, II, III) and seven crop growth stages (nursery, nursery/land preparation, land preparation, initial, development, mid-season, late-season) were studied. The harvest reference evapotranspiration (ET0) and irrigation requirements of boro rice produced in the area were calculated in this study. The Chattogram meteorological Station collected many climate data from 1988 to 2018, with the model calculating 40.77mm/day ETo within the study region, with the best quantity of 4.30 mm/day in April and the lowest 2.36 mm/day in December. The cultures' evapotranspiration ranged from 0.29 mm/day to 4.84 mm/day. The average annual precipitation and effective precipitation for plant growth and development were 300.7 mm/day and 105.1 mm, respectively. It is determined that the irrigation water demand is 543.5 mm/dec. This was compared to CROPWAT's irrigation water demand data to determine whether or not farmers were engaged in associated economic irrigation application.

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