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Tamil Nadu Agricultural University (2018)

Sustaining pulse production in changing climate over tamil nadu

Pradipa C.

Titre : Sustaining pulse production in changing climate over tamil nadu

Auteur : Pradipa C.

Université de soutenance : Tamil Nadu Agricultural University

Grade : Doctor of Philosophy (PhD) Agriculture - Meteorology 2018

Résumé
A research study was carried out at Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore during 2016-2018 to understand the impact of climate change on major pulse crops of Tamil Nadu and attempts to devise adaptation options through crop simulation modeling by incorporating the downscaled projected climate data was carried out. The research was done by imposing the downscaled climate data (CCSM4 data using REGCM4.4 model) for RCP 4.5 into CSM DSSAT for the crops, Blackgram and Redgram. The impact of Climate Change on these crops was studied with the default sowing date that is under practice (August 1st) while the adaptation strategies viz., evaluation of the existing important cultivars, altering the date of sowing (advancing and receding by 15 and 30 days), modifying the nitrogenous fertilizer input and if indispensable, devising a virtual cultivar were also examined. For elimination of the regions, that would be inefficient for these selected pulse crops to flourish, Efficient Cropping Zones were identified using RSI and RYI. The cultivars CO6 and VBN6 of Blackgram, and APK1 and CO(RG)7 of Redgram were employed for the study after calibration and validation of the DSSAT model, as these are the popular varieties preferred by the farmers. The efficient regions for the five major pulse crops over Tamil Nadu where they would be grown with the effective utilization of the available resources were identified. It was found that the High altitude and hilly zone as well as High rainfall zone were insignificant for the five important pulse crop of Tamil Nadu. The projected changes in the maximum temperature, minimum temperature and rainfall were also briefly studied. The relative increase in maximum temperature was 1.58, 2.01 and 3.64 ºC during the near, mid and end century, respectively. The minimum temperature increase by 3.26, 5.17, 6.59 ºC during the near, mid and end century, respectively. The relative deviation in rainfall over Tamil Nadu was found to be 202.77 mm (13.1 %), 428.61 mm (27.7 %) and 94.12 mm (6.1 %) during the near, mid and end century, respectively. The yield of Blackgram and Redgram were found to have beneficial stimulus towards the changing climate.

Présentation et version intégrale (Shodhganga)

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