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Geethalakshmi, V.
- Rainfall Scenario in Future over Cauvery Basin in India
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1 Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore-3
1 Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore-3
Source
Indian Journal of Science and Technology, Vol 6, No 7 (2013), Pagination: 4966-4970Abstract
A study was undertaken for developing rainfall scenarios using the ensemble of all 16 different Global Climate Model outputs for A1b scenario for mid (2040-2069) and end (2070-2099) century. For the analysis, the entire Cauvery basin was demarcated into five smaller basins viz., Basin 1 (Upper Cauvery upto Mettur reservoir), Basin 2 (Bhavani basin from Mettur to Upper Anicut), Basin 3 (Amaravathy basin), Basin 4 (Upper Anicut to Grand Anicut) and Basin 5 (Downstream of Grand Anicut, including lower Anicut and the delta region). From the 16 Global Climate Model ensemble outputs, rainfall in the mid century is expected to increase in the SWM months starting from May through December in the order of 1 to 36% (Basin 1), 3 to 21% (Basin 2), 1 to 17% (Basin 3), 3 to 22% (Basin 4) and 4 to 22% (Basin 5). The same trend is expected in the end century with different magnitude. The South West Monsoon (JJAS) and post-monsoon rainfall (ONDJ) is expected to increase towards mid and end century whereas not much change is expected in the pre-monsoon rainfall in the future. Annual rainfall is expected to be 21, 11 and 7% more during mid century compared to the baseline (1981-2000) in the upper Cauvery (Basin 1), mid Cauvery (Basin 2, 3 and 4) and delta region (Basin 5) respectively. The rainfall would be higher by 33, 15 and 10% than the current quantity in the upper Cauvery, mid Cauvery and delta region respectively during end century. These results could contribute to the development of policies for future agricultural water management.Keywords
Cauvery Basin, Climate Model Ensemble, RainfallReferences
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- Comparative Performance of RegCM Model Versions in Simulating Climate Change Projection over Cauvery Delta Zone
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Authors
Affiliations
1 Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore-641003, Tamilnadu, IN
1 Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore-641003, Tamilnadu, IN
Source
Indian Journal of Science and Technology, Vol 6, No 8 (2013), Pagination: 5115-5119Abstract
RegCM is a Regional Climate Model (RCM), mostly applied in regional climate change and seasonal prediction around the world. The International Centre for Theoretical Physics improves this model and releases updated version over years. In the present study a comparison was made between RegCM3 and RegCM4 versions of this model in simulating climate change over Cauvery Delta Zone of Tamilnadu. The simulations were made using ECHAM5 global climate model outputs of A1B scenario with a resolution of 25 km from 1971 to 2100. The comparison of yearly and decadal means indicated that there exists a significant and positive difference in simulation of rainfall and relative humidity by RegCM4 while solar radiation, maximum temperature, minimum temperature and wind speed showed significant negative difference. The Seasonal and monthly comparisons revealed that difference across weather variables is not consistent as that of yearly and decadal. The decadal projections showed a marked increase in maximum temperature, minimum temperature and rainfall. A slight increase in relative humidity and a slight decline in solar radiation and wind speed were noticed under RegCM4 simulations.Keywords
RegCM3, RegCM4, Cauvery Delta Zone, A1B ScenarioReferences
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- Identification of Efficient Cropping Zone for Rice, Maize and Groundnut in Tamil Nadu
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Authors
Affiliations
1 Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore-3, IN
1 Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore-3, IN
Source
Indian Journal of Science and Technology, Vol 6, No 10 (2013), Pagination: 5298-5301Abstract
A methodological study was made at the Agro Climate Research Centre, Tamil Nadu Agricultural University, and Coimbatore during 2012 to identify the potential districts for cultivation of rice, maize and groundnut in Tamil Nadu. The data on area, production and productivity of study crops for 2000–‘01 to 2009–‘10 were collected and indices such as Relative Spread Index (RSI) and Relative Yield Index (RYI) were computed and the potential cropping districts for the study crops were identified. In Tamil Nadu, nine districts were found to be prospective regions for rice, seven districts for maize and three districts for groundnut as in these areas both the RYI and the RSI were high. In some of the districts, RSI is more for a particular crop, while the RYI is low indicating non suitability of that crop. However, due to other factors such as market demand and value of the produce, farmers cultivate the crops that are not suitable for their location which relates in high RSI with low RYI.Keywords
Efficient Cropping Zone, Relative Spread Index, Relative Yield IndexReferences
- Sanbagavalli S, Rohini A et al. (2002). Efficient cropping zones - decadal analysis for major crops in Tamil Nadu, Indian Journal of Agricultural Research, vol 36(4), 227–233.
- Thavaprakaash N, Babu C et al. (2008). Identifying potential cropping zones for important horticultural crops of Tamil Nadu, The Madras Agricultural Journal, vol 95(7–12), 418–424.
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- Kanwar J (1972). Cropping patterns, scope and concept, In. Proc. Symp, on Cropping Pattern in India, ICAR, New Delhi, 11–32.
- Narayanan A L, Balasubramanian T N et al. (2003). Identification of efficient rice cropping zone for union territory of Pondicherry, The Madras Agricultural Journal, vol 90 (10–12), 729–731.
- Poornima S, Kokilavani S Et al. (2008). Examining the prospective cropping zone of important field crops of Tamil Nadu, The Madras Agricultural Journal, vol 95 (7–12), 364–370.
- Effect of Elevated Temperature on Development Time of Rice Yellow Stem Borer
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Authors
Affiliations
1 (Agricultural Meteorology), Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, IN
2 (Department of Entomology), Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, IN
3 (Agro Climate Research Centre), Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, IN
1 (Agricultural Meteorology), Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, IN
2 (Department of Entomology), Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, IN
3 (Agro Climate Research Centre), Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 6, No 12 (2013), Pagination: 5563–5566Abstract
Insects, as cold-blooded animals are directly under the control of temperature for their growth and they cannot sustain living below and above certain thresholds. Therefore, temperature is probably the single most important environmental factor influencing insect behavior. Current estimates of changes in climate indicate an increase in global mean annual temperatures of 1°C by 2025 and 3°C by the end of the next century. Such increases in temperature may decrease the developmental time and increase the number of generations per year. An investigation was adopted to understand the effect of five different constant temperatures (28.3°C, 30.6°C, 32.7°C, 34.3°C and 36°C) on the development time of Yellow Stem Borer (YSB). The results revealed that the number of eggs laid by YSB increased at higher temperatures while egg hatching was reduced. Egg hatching was higher (90.6%) in 30.6°C followed by 28.3°C. The development time taken by different stages of the YSB revealed that there was an inverse relationship with development time and incubation temperature level. Insects develop faster which may oviposit early and hence the population was likely to grow earlier than expected.Keywords
Yellow Stem Borer, Temperature, Climate Change, Global WarmingReferences
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- Influence of Projected Climate on Rice Yield Over Tamilnadu
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Authors
Affiliations
1 Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore-641003, Tamilnadu, IN
1 Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore-641003, Tamilnadu, IN
Source
Indian Journal of Science and Technology, Vol 8, No 11 (2015), Pagination:Abstract
A study was carried out at Agro Climate Research Centre, Tamil Nadu Agricultural University using PRECIS and RegCM4 Regional Climate Models (RCMs) by downscaling HadCM3 (Q0) and ECHAM5 global climate model outputs at 25 km resolution. The downscaled data obtained from the RCMs were verified with CRU observed climatology and found to have good agreement. Four weather variables viz., maximum temperature, minimum temperature, solar radiation and rainfall were extracted and employed in DSSAT crop simulation model for rice yield simulation for agricultural grids of Tamilnadu State India from 1971-2100. Two treatments were fixed as control and CO2 enriched conditions. The maximum temperature and minimum temperature showed increase in temperature at the end of the century with high rate of increase for minimum temperature. Rainfall exhibited high variability. The rice yield simulations showed decline in yield in the study period for both control and CO2 enriched conditions, with later consistently showing higher yields than the former till the end of 21st century.Keywords
21st Century, Climate Projection, Rice Yield, Tamilnadu- Evaluation of Weather based Crop Insurance Products for Kharif Rice
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Authors
Affiliations
1 Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore-641 003, IN
1 Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore-641 003, IN