Delineation of thermal requirements of wheat (Triticum aestivum) staggered in different sowing windows and their validation

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dc.contributor.authorSharma, Ambika
dc.date.accessioned2021-07-30T06:34:23Z
dc.date.available2021-07-30T06:34:23Z
dc.date.issued2021
dc.description.abstractOwing to lack of work on delineation and mapping of thermal requirements of wheat under Punjab conditions, the present study on “Delineation of thermal requirements of wheat (Triticum aestivum) staggered in different sowing windows and their validation” was carried out to assess the impact of climate change. The study used long term temperature data from 1990-2049, wheat yield data from 1990-2018 and phenological data of the field trial, conducted during Rabi season 2019-2020 at research farm PAU, Ludhiana, with wheat variety Unnat PBW 343 and five dates of sowing (D1-25th October, D2-5th November, D3-15th November, D4-25th November and D5-5th December). In field experiment, maximum calendar days (156), accumulated growing degree days (1615.5°C day) and grain yield (62.1 q/ha) were recorded for 5th November sown crop. Results of trend analysis recorded highest rate of increase in AGDD at S.B.S. Nagar (21.05°C day yr-1) under sowing window IV and heat use efficiency at Bathinda (0.046 kg ha-1 °C day-1 yr-1) under sowing window V. Pentad wise analysis revealed that under all sowing windows, maximum variability in HUE was observed during P5 (2010-2014) and minimum during P1 (1990-1994). Through maps, it was observed that spatially under all sowing windows, AGDD showed an increasing pattern in north-east and central regions of the state during the past 30 years, while south-west region reflected increasing pattern only under sowing window IV. Results of future validation projected that most positive deviation in CRI (103.04%) and flowering (55.85%) is likely to occur at Rupnagar and physiological maturity (46.05%) at Patiala during F6 (2045-2049), respectively. However, Amritsar is likely to have least deviation in flowering (6.28%) and physiological maturity (7.19%) during F1 (2020-2024). The study concluded that increasing pattern of thermal requirements warns about more warming scenarios in future and thus, creating a strong need to develop region specific climate smart adaptation strategies.en_US
dc.identifier.citationSharma, Ambika (2021). Delineation of thermal requirements of wheat (Triticum aestivum) staggered in different sowing windows and their validation (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810171148
dc.keywordsWheat, Date of sowing, Phenology, Accumulated growing degree days (AGDD), Spatio-temporal variability, Pentad, Geo-spatial technology, Heat use efficiency (HUE)en_US
dc.language.isoEnglishen_US
dc.pages150en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemDelineation of thermal requirements of wheat (Triticum aestivum) staggered in different sowing windows and their validationen_US
dc.subAgricultural Meteorologyen_US
dc.themeDelineation of thermal requirements of wheat (Triticum aestivum) staggered in different sowing windows and their validationen_US
dc.these.typeM.Scen_US
dc.titleDelineation of thermal requirements of wheat (Triticum aestivum) staggered in different sowing windows and their validationen_US
dc.typeThesisen_US
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