MODELLING NET IRRIGATION WATER REQUIREMENTS AND IRRIGATION SCHEDULING OF BORO RICE USING ........

According to the conclusions of this study, the FAO-Penman-Montieth equation is frequently suggested as the standard method for computing reference and crop evapotranspiration notwithstanding crop and irrigation water requirements using the FAO CROPWAT 8.0 and CLIMWAT 2.0 models. In Bangladesh's northern parts, accurate measurement of irrigation water demand trends has a significant impact on water resource planning for agricultural development and expansion. The net irrigation water requirement of boro rice switched into a rising pattern at the 5% level of significance, confined between 74.0 mm and 7.4 mm per year. The tendency shifted away from temperature and toward an integrative effect of wind speed, relative humidity, rainfall, and evapotranspiration (ET0). The monthly reference evapotranspiration (ETo) for boro rice was calculated to be 3.69 mm/day. The highest crop water requirement (ETc) was 61.0 mm/dc in April, while the entire crop water requirement (ETc), including land preparation, was 586.0 mm/dc. The largest irrigation demand for the month of March was 52.0 mm/dec, with a total irrigation demand of 621.8 mm/dc during the crop season. Boro rice was irrigated, and the CROPWAT model indicated that a successful harvest would require a net irrigation water requirement of 448.2 mm and a gross irrigation water requirement of 595.1 mm (with 70% field efficiency). These discoveries could be used to increase water efficiency and streamline boro rice production in the Rajshahi district of Bangladesh.

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