Impact of climate change on irrigation water demand of dry season Boro rice in northwest Bangladesh

Abstract

Climate change will affect irrigation water demand of rice via changes in rice physiology and phenology, soil water balances, evapotranspiration and effective precipitation. As agriculture is the main sector of water use in Bangladesh, estimation of the agricultural water demand in the changing environment is essential for longterm water resources development and planning. In the present paper, a study has been carried out to estimate the change of irrigation water demand in dry-season Boro rice field in northwest Bangladesh in the context of global climate change. The study shows that there will be no appreciable changes in total irrigation water requirement due to climate change. However, there will be an increase in daily use of water for irrigation. As groundwater is the main source of irrigation in northwest Bangladesh, higher daily pumping rate in dry season may aggravate the situation of groundwater scarcity in the region.

Farmers’ adaptation to water scarcity in drought-prone environments: A case study of Rajshahi District, Bangladesh

“…However, seasonal and inter-annual variability of rainfall is high in the district where a disproportionate amount of rain (90%) falls during short spells (June-October), even though the total amount of rain does not change much (BMD, 2013;Rashid et al, 2013;Shahid, 2011). As a result, agricultural production is constantly threatened due to the high likelihood of drought and recurring water shortages.…”

Impact of temperature changes on groundwater levels and irrigation costs in a groundwater-dependent agricultural region in Northwest Bangladesh

“…Herrington (1996) estimated an irrigation demand increased of 12% in England because the temperature increased by 1.1°C. Similar studies in other parts of the world indicate that rising temperature due to global warming will increase irrigation demand in most climate regions (Peterson and Keller, 1990;Rosenberg et al, 1990;Shahid 2011;Wang et al, 2016a, b).…”

“…The intensively irrigated agriculture in the area effectively contributes to ensuring the food security of Bangladesh. However, because of inappropriate anthropogenic intervention, the ground water level during the irrigation period continues to decrease (Shahid and Behrawan, 2008;Shahid, 2011). Currently, the groundwater levels in most of the shallow tube-wells, which are widely used for irrigation, are below the suction lift capacity during the peak irrigation period.…”

Impact of Climatic Paramaters on Aman Rice Production in Rangpur District.

“…Agriculture in Bangladesh is already under pressure both from huge and increasing demands for food, and from problems of agricultural land and water resources depletion (Ahmed et al,2000). Among the agricultural products only rice is contributing to about 71% of total agro based production in Bangladesh (Shahid, 2011;Hasan et al, 2017). Bangladesh is facing challenges in tackling and managing the effect of uncertain climate change.…”