Impact of climate change on evapotranspiration of pea using CROPWAT model in Himachal Himalayas
Sargun Kaur, Mohan Singh, SK Bhardwaj
Pea is one of the most important Rabi crops of Himachal and northern gangetic plain and thousands of farmers depends upon its cultivation to earn their livelihood. Reference crop evapotranspiration (ET0) and crop evapotranspiration (ETc) of pea during Rabi 2017-18 for mid hill region of Himachal Pradesh was computed using FAO CROPWAT model. Seasonal mean reference crop evapotranspiration (ET0) was relatively higher in D2 (1.79 mm/day) as compared to D1 (1.59 mm/day) and similar trend was also observed in radiation use efficiency viz. 14.77 MJ/m²/day and 14.19 MJ/m²/day, respectively. A direct relation was observed between ET0 and RUE. It was also found that an increase in the existing temperature by 0.5, 1.0, 1.5 and 2.0 oC will increase the ET0 by 0.63, 1.26, 1.89 and 2.52 % and irrigation water requirement by 1.10, 2.21, 3.31and 4.35 %, respectively. A higher positive linear relation was observed between predicted and observed ET for first date of sowing which indicated that pea must be sown on or before 1st December in the mid hills of HP. The study concluded that global warming scenarios are likely to increase crop water requirements, suggesting thereby the need for effective planning and sustainable use of water resources in the region.
Sargun Kaur, Mohan Singh, SK Bhardwaj. Impact of climate change on evapotranspiration of pea using CROPWAT model in Himachal Himalayas. International Journal of Ecology and Environmental Sciences. 2020; 2(4): 425-428.