Simulating the impact of climate change on evapotranspiration of barley (Hordeum vulgare L.) using CROPWAT
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Date
2017
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Punjab Agricultural University, Ludhiana
Abstract
Field experimentations on “Simulating the impact of climate change on evapotranspiration of barley (Hordeum vulgare L.) using CROPWAT” was conducted at Research Farm, School of Climate Change and Agricultural Meteorology, Punjab Agricultural University, Ludhiana during rabi 2016-17. ET requirements of barley for Gurdaspur was also computed by CROPWAT model using the input parameters. The experiment was laid out in split plot design with three replications comprising of three sowing environments D1 (25th October), D2 (10th November), D3 (25th November); two varieties V1 (DWRUB-52) & V2 (PL-807) and three irrigation levels I1 (Recommended), I2 (Skip at vegetative stage) and I3 (Skip at anthesis stage). Growth parameters and yield attributes were higher in crop sown on 10th November as compared to 25th October and 25th November sown crop. DWRUB-52 performed better in terms of several growth parameters, yield components and water use efficiency as compared to PL-807. The 10th November sown crop produced grain yield (45.31 q/ha) much higher than 25th October (42.49 q/ha) and 25th November (37.95 q/ha) sown crop. Mean crop evapotranspiration computed with soil moisture depletion method was higher for 25th November sown crop (38.16 cm) followed by 25th October (37.11 cm) and 10th November (36.01 cm) sown crop. Reference crop evapotranspiration computed by CROPWAT was found higher for Ludhiana (2.74 mm day-1) than Gurdaspur (2.17 mm day-1). Irrigation requirement estimated by CROPWAT was maximum for Ludhiana (299 mm/dec) than Gurdaspur (173 mm/dec). The increasing temperature scenarios i.e. +0.5, +1.0, +1.5 and +2 0C were attempted to investigate the effect of Climate Change on ET requirement of Barley at Ludhiana and Gurdaspur. The elevated temperatures were found to increase the water requirement of barley on both the locations using CROPWAT 8.0.
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