Academic literature on the topic 'Cauvery Delta'

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Journal articles on the topic "Cauvery Delta"

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Daniel, J. Alfred, and K. Ramaraju. "Collecting parasitic Aculeata (Hymenoptera) from rice ecosystems of Tamil Nadu, India." Journal of Threatened Taxa 12, no. 8 (2020): 15828–34. http://dx.doi.org/10.11609/jott.4724.12.8.15828-15834.

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Surveys were conducted to explore the parasitic aculeate fauna in rice ecosystems of Tamil Nadu in 2015–2016 in three different rice growing zones, viz., the western zone, the Cauvery delta zone and the high rainfall zone. The study recorded a total of 32 aculeates that represent 12 species under seven families belonging to three super families, viz., Apoidea (Apidae), Chrysidoidea (Bethylidae, Chrysididae, & Dryinidae), and Vespoidea (Mutillidae, Scoliidae, & Thiphiidae). Alpha and beta diversity were computed for the three zones and the diversity indices (Simpson’s index, Shannon-Wiener index, Pielou’s index) revealed the high rainfall zone as the most diverse zone, with the Cauvery delta zone being the least diverse. On comparing the species similarities using the Jaccard’s index in between the three zones taken in pairs, it was found that 42 per cent similarity existed between the western and Cauvery delta zone and 11 per cent similarity between high rainfall and Cauvery delta zones and 16 per cent similarity between the high rainfall and western zones.
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Daniel, J. Alfred, K. Ramaraju, and A. Rameshkumar. "Comparative studies of mymarid diversity from three different zones of paddy ecosystem in Tamil Nadu, India." ENTOMON 44, no. 3 (2019): 173–82. http://dx.doi.org/10.33307/entomon.v44i3.458.

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Surveys were conducted to explore the mymarid fauna from three different rice growing zones viz., western zone, Cauvery delta zone and high rainfall zone in Tamil Nadu during 2015-16. In the present study, 92 mymarid parasitoids comprising of 8 species under 7 genera viz., Anagrus sp., Anaphes sp., Camptoptera sp., Dicopus longipes (Subba Rao), Lymaenon delhiensis Narayanan and Subba Rao, Lymaenon munnarus Mani and Saraswat, Mymar pulchellum Curtis and Ptilomymar dictyon Hayat and Anis were collected. Alpha and beta diversity were computed for the three zones and the diversity indices (Simpson’s index, Shannon-Wiener index, Pielou’s index) revealed high rainfall zone as the most diverse zone, while Cauvery delta zone being the least diverse. Dicopus longipes is found to the predominant species in rice ecosystem. Jaccard’s index of species similarity comparison revealed 42.5 per cent similarity between western and Cauvery delta zones and 62.5 per cent similarity between high rainfall and Cauvery delta zones and 62.5 per cent similarity between high rainfall and western zones. Correspondence analysis and Bray-curtis cluster analysis were also done to understand the diversity assemblage of the mymarids that were collected.
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Atee, Feby, N. Chitra, V. Balasubramani, Sheela Venugopal, and R. Kumaraperumal. "Inventory of leafhoppers in irrigated rice in Tamil Nadu." Oryza-An International Journal on Rice 60, no. 3 (2023): 473–78. http://dx.doi.org/10.35709/ory.2023.60.3.11.

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Leafhoppers diversity was studied in irrigated rice ecosystems of Cauvery Delta Zone, High Rainfall Zone and Western Zone. Leafhopper assemblage comprised 14 species of Cicadellidae and among them Maiestas dorsalis (Motschulsky) was found to be the most abundant species (35.02%), followed by Cofana spectra (Distant) (23.15%). The order of species diversity in the observed districts were Western Zone (13 species) > High Rainfall Zone (8 species) > Cauvery Delta Zone (4 species). Shannon Weiner Index revealed a higher diversity in High Rainfall Zone and Western Zone (H'= 1.77 > 1.76). Margalef's Index of species richness was observed highest in Western Zone (a = 1.93). Pielou's Evenness Index was found to be almost similar for Western Zone (0.30) and Cauvery Delta Zone (0.29) while High Rainfall Zone exhibited highest evenness (0.37). Jaccard index of similarity of 50% (highest) was observed between Western Zone and Kanyakumari, Cauvery Delta Zone and High Rainfall Zone. Berger-Parker Index of dominance (D) revealed M. dorsalis to be the most dominant in Western Zone (0.25) and Cauvery Delta Zone (0.66) while High Rainfall Zone showed a high dominance of Nephotettix nigropictus (Stål) (0.27). Among the leafhoppers studied Balclutha incisa (Matsumura), Cicadulina bipunctata (Melichar), Empoascanara maculifrons (Motschulsky), Exitianus sp., Thomsonia porrecta (Walker) were recorded for the first time in rice ecosystem of Tamil Nadu. The present study will be a baseline information on the diversity of leafhoppers in irrigated rice of Tamil Nadu and will complement the data collected in the future to gain a holistic understanding on the leafhopper diversity of Tamil Nadu.
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Daniel, Johnson Alfred, and Kunchithapatham Ramaraju. "Diversity of parasitic Hymenoptera in three rice-growing tracts of Tamil Nadu, India." Journal of Threatened Taxa 11, no. 13 (2019): 14681–90. http://dx.doi.org/10.11609/jott.4529.11.13.14681-14690.

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Parasitic hymenoptera play a vital role in rice ecosystems as biocontrol agents of pests. Surveys were conducted from August 2015 to January 2016 in three rice growing zones in Tamil Nadu: western zone, Cauvery Delta zone, and high rainfall zone. A total of 3,151 parasitic hymenoptera were collected, of which 1,349 were collected from high rainfall zone, 1,082 from western zone, and 720 from Cauvery Delta zone. Platygastridae, Ichneumonidae, and Braconidae were the most abundant families in all the three zones. The species diversity, richness, evenness as well as beta diversity were computed for all three zones via Simpson’s, Shannon-Wiener and Margalef indices. The results showed the high rainfall zone to be the most diverse and the Cauvery Delta zone the least diverse, but with more evenness. Pairwise comparison of zones using Jaccard’s index showed 75–79% species similarity.
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Arivelarasan, Tamilarasu, V. S. Manivasagam, Vellingiri Geethalakshmi, et al. "How Far Will Climate Change Affect Future Food Security? An Inquiry into the Irrigated Rice System of Peninsular India." Agriculture 13, no. 3 (2023): 551. http://dx.doi.org/10.3390/agriculture13030551.

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Climate change poses a great challenge to food security, particularly in developing nations where important food crops such as rice and wheat have been grown in large quantities. The study investigates food security using an integrated approach, which comprises forecasting future rice production using the AquaCrop model and demand for rice using an economic model. The proposed approach was evaluated in the Cauvery delta zone in the eastern part of Tamil Nadu, which is a major rice-growing hotspot in peninsular India. Our results showed that the future rice productivity of the Cauvery delta region would be reduced by 35% between 2021 and 2040 and by 16% between 2041 and 2050. However, the supply–demand gap addressing food security in the Cauvery delta zone is positive for the future, as evidenced by the availability of surplus rice of 0.39 million tonnes for the period 2021–2030 and 0.23 million tonnes and 0.35 million tonnes for the periods 2031–2040 and 2041–2050, respectively. Nevertheless, as the neighboring regions are relying on rice production from the Cauvery delta, this surplus rice production is potentially not sufficient to meet the demand of the state as a whole, which suggests climate change may pose a severe threat to the food security of the Tamil Nadu State. These findings emphasize the necessity of performing regional-level food security assessments with a focus on developing location-specific policy options to mitigate the adverse effects of climate-induced anomalies on food security.
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Alappat, L., S. Tsukamoto, P. Singh, D. Srikanth, R. Ramesh, and M. Frechen. "Chronology of Cauvery Delta Sediments from Shallow Subsurface Cores Using Elevated-Temperature Post-IR IRSL Dating of Feldspar." Geochronometria 37, no. -1 (2010): 37–47. http://dx.doi.org/10.2478/v10003-010-0025-1.

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Chronology of Cauvery Delta Sediments from Shallow Subsurface Cores Using Elevated-Temperature Post-IR IRSL Dating of Feldspar We present the results of luminescence dating of sediments from two cores from the Cauvery Delta in south-east India. Since all natural quartz OSL signals except one sample were in saturation, the elevated temperature post-IR IRSL protocol for K-feldspar was applied to establish a chronology. Internal dose rates of K-feldspar grains were calculated from the measured internal content of potassium, uranium, thorium and rubidium in the bulk of K-feldspar grains using solution ICP-OES and ICP-MS analysis. A substantial scatter in single-aliquot De values was observed which is most probably due to the effect of incomplete bleaching of fluvial sediments before burial. A minimum age model was applied to extract possible depositional ages. The study revealed that except an upper layer of Holocene sediments (< 5m), the majority of the upper ~50m of Cauvery delta sediments were deposited between marine isotope stage MIS-5 and MIS-10 or older. The feldspar luminescence ages also indicate the existence of a period of non deposition or erosion in the upper part of the cores.
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S, ANTHONI RAJ, GOPALASWAMY G, and ABDUL KAREEM A. "AZOLLA BIOMASS PRODUCTION IN CAUVERY DELTA ZONE." Madras Agricultural Journal 81, July (1994): 390–91. http://dx.doi.org/10.29321/maj.10.a01544.

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Azolla, the water fern grows luxuriantly in cooler periods and the optium temperature ranges from 25-30°C. Due to the hot summer preceding the kharif season rice raised in the Cauvery Delta Zone, raising Azolla as dual crop in rice is not in vogue. Among the Azolla species, A. microphylla adopted itself to this environment at Aduthurai. The biomass production was adequate in summer to provide supply of inoculum for the ensuing Kuruvai crop. Azolla production ranged from 42 g/m²/day to 164 g/m2/day with a 60 day mean production of 92 g/m²/day during April-June, 1990. Despite a water temperature of 42°C attained at 2 PM, A. microphylla established well.
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S, ANTHONI RAJ, GOPALASWAMY G, and ABDUL KAREEM A. "AZOLLA BIOMASS PRODUCTION IN CAUVERY DELTA ZONE." Madras Agricultural Journal 81, July (1994): 390–91. http://dx.doi.org/10.29321/maj.10.a01544.

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Azolla, the water fern grows luxuriantly in cooler periods and the optium temperature ranges from 25-30°C. Due to the hot summer preceding the kharif season rice raised in the Cauvery Delta Zone, raising Azolla as dual crop in rice is not in vogue. Among the Azolla species, A. microphylla adopted itself to this environment at Aduthurai. The biomass production was adequate in summer to provide supply of inoculum for the ensuing Kuruvai crop. Azolla production ranged from 42 g/m²/day to 164 g/m2/day with a 60 day mean production of 92 g/m²/day during April-June, 1990. Despite a water temperature of 42°C attained at 2 PM, A. microphylla established well.
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Kanaka, S. and Subrahmaniyan, K. "Yield gap analysis of Paddy in Tamil Nadu." International Journal of Agricultural Invention 8, no. 2 (2023): 228–33. https://doi.org/10.46492/ijai/2023.8.2.13.

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Paddy cultivated in over 45,800 hectares in 24 districts including Tanjavur and Tiruvarur of Cauvery delta zone of Tamil Nadu. India has recorded an average Paddy productivity of 2.4. t/ha and Tamil Nadu has an yield level of over 3.15 t/ha on the year 2021 exceeding national level. Keeping in view of the production and productivity of Paddy at the national and state levels, and an in depth analysis of production and yield gap of ADT 43 at Cauvery delta zone were studied. The productivity ranged from 3638 Kg/ha in Tanjavur district to 5117 Kg/ha in Tiruvarur district with the mean productivity of 4435 Kg/ha in the Cauvery Delta Zone. (S and C report of GoTN) The mean yield gap in Cauvery delta Zone was 26.33%. The constraints to Paddy productivity included non-availability labour, late planting due to delayed water supply from metur dam and incidence of pests and diseases. The research study given that among the different categories of paddy growers, small farmers were found to have an average yield gap of 55.63 percent followed by medium farmers with an average yield gap of 30.35 percent and for large farmers, the average yield gap was found to be 20.25 %. The R-squared value (R2) is provided as 0.524, which indicates the proportion of variance in the yield gap that is explained by thefactors included in the regression model. The F-statistic is given as 3.404**, which is a test of overall significance for the regression model. These results suggests that the cost of inputs, using own seeds on multiple years, and chemical pesticide usage are significantfactors influencing the yield gap in paddy cultivation, while non-availability of labor and not following soil testing recommendations are not significant factors in this analysis.
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Alfred, Daniel J., K. Ramaraju, and Santhosh Shreevihar. "A Survey of Eulophid Wasps (Hymenoptera: Chalcidoidea) Associated with Rice Ecosystems of Tamil Nadu." Halteres 11 (December 31, 2020): 108–17. https://doi.org/10.5281/zenodo.4406210.

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<strong>Surveys were conducted to explore the eulophid fauna in rice ecosystems of Tamil Nadu during 2015-16 in three different rice-growing zones <em>viz.,</em> western zone, Cauvery delta zone and high rainfall zone. </strong><strong>In the present study, a total of 161 eulophid individuals were collected from rice ecosystems that represent 3 subfamilies, 8 genera and 14 species. The three subfamilies are Entodoninae, Eulophinae and Tetrastichinae</strong><strong>. Alpha and beta diversity were computed for the three zones and the diversity indices (</strong><strong>Simpson&rsquo;s index, Shannon-Wiener index, Pielou&rsquo;s index) revealed that the high rainfall zone was the most diverse zone, while the western zone being the least. <em>Aprostocetus benazeer</em> Narendran was found to be the most abundant species in the rice ecosystem with a relative density of 12.4 per cent. </strong><strong>On comparing the species similarities using the Jaccard&rsquo;s index in between the three sites taken in pairs, it was found that 66 per cent similarity between western and Cauvery delta zones and 42 per cent similarity between high rainfall and Cauvery delta zones and 35 per cent similarity between high rainfall and western zones.</strong>
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Book chapters on the topic "Cauvery Delta"

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Dhanakumar, S., K. Rutharvel Murthy, R. Mohanraj, K. Kumaraswamy, and S. Pattabhi. "Phosphorous Fractionation in Surface Sediments of the Cauvery Delta Region, Southeast India." In Environmental Management of River Basin Ecosystems. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13425-3_22.

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Kokkat, Aswin, N. C. Mondal, P. J. Sajil Kumar, and E. J. James. "Variability of Ground Water Quality in Quaternary Aquifers of the Cauvery and Vennar Sub-basins within the Cauvery Delta, Southern India." In Sustainability of Natural Resources. CRC Press, 2024. http://dx.doi.org/10.1201/9781003303237-12.

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Valarmathi, A., S. Nalini, and M. Kalidhas. "Soil Contamination Level in Cauvery Delta Region Through Machine Learning and GIS Techniques." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6513-5_2.

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Ramathilagam, Arun Balaji, Sudha Natarajan, and Anil Kumar. "Crop Classification in the Cauvery Delta Zone Using Machine Learning on Multi-Sensor Data." In Soft Computing: Theories and Applications. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0707-4_20.

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Murugan, R., R. Karthika devi, Anitha Juliette Albert, and Deepak Kumar Nayak. "An IOT Based Weather Monitoring System to Prevent and Alert Cauvery Delta District of Tamilnadu, India." In Lecture Notes on Data Engineering and Communications Technologies. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-24643-3_55.

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Dhanakumar, S., and R. Mohanraj. "Fractionation of Iron in River-Bed Sediments: Implications for the Assessment of Environmental Integrity of the Cauvery Delta Region, India." In On a Sustainable Future of the Earth's Natural Resources. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-32917-3_6.

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Samidurai, Jayakumar, Honestraj Natarajan, Ashwin Cheruthottunkara Purushothaman, Paramanandham Jothi, Dhananjayan Venugopal, and Muralidharan Subramanian. "Factors Influencing Agrochemical Use, Practices, and Knowledge Systems: Case Study of Rice Farmers in the Cauvery Delta Zone of Tamil Nadu, India." In Sustainable Development and Biodiversity. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3439-3_18.

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Thangaraj, Kongeswaran, and Sivakumar Karthikeyan. "Application of Remote Sensing and GIS in Floodwater Harvesting for Groundwater Development in the Upper Delta of Cauvery River Basin, Southern India." In Water Resources Management and Sustainability. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6573-8_14.

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Raj, A. Stanley, J. P. Angelena, R. Damodharan, and D. Senthil Kumar. "Self-Generating Training Model (SGTM) Algorithm to Estimate Groundwater Level in Consensus with Climate Change Impact Study in Cauvery Delta Zone, Tamil Nadu, India." In Earth and Environmental Sciences Library. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-42056-6_5.

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G., Moghanraj Yadhav, Balaguru Balakrishnan, and Nagamurugan N. "Protection of Indian Traditional Rice Varieties." In Intellectual Property Rights and the Protection of Traditional Knowledge. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1835-9.ch008.

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The crop genetic diversity has been sustainably maintained by the farmers of different regions for generations through cross-breeding. Competition among commercial ventures has placed these traditional varieties under severe exploitation and pilferage. The Indian government, to preserve these traditional varieties, has established PPV and FRA (Protection of Plant Varieties and Farmers Rights Act), which are on par with Intellectual Patent Rights (IPR). This gives the rights and ownership of the crop breed and its characterization to the traditional farmers who developed it. The researchers along with VAANGHAI, an NGO, have represented the traditional farmers, who are growing and maintaining traditional crops in Cauvery River's coastal delta region in Tamil Nadu to characterize and register their varieties under PPV and FRA. This study has identified around 69 rice varieties and characterized them based on their uniqueness, distinctiveness, stability, uniformity, test trials, and adaptability potential. Most potential rice varieties were registered under this act.
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Conference papers on the topic "Cauvery Delta"

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Purneemaa, R. S., and Surendar Manickam. "Evaluating the Spatial and Temporal Patterns of Subsidence in the Cauvery Delta Using Multi-Temporal Interferometric SAR Technique." In 2024 IEEE India Geoscience and Remote Sensing Symposium (InGARSS). IEEE, 2024. https://doi.org/10.1109/ingarss61818.2024.10984050.

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Prasanth, S. Ravi, T. K. Senthamizh, K. Arun Prasad, and Sulochana Shekhar. "Analyzing the Spatio-Temporal Dynamics and Micro-Level Spatial Metrics of Coastal Aquaculture in the Cauvery Delta Using Sentinel-1 Time Series Data." In 2024 IEEE India Geoscience and Remote Sensing Symposium (InGARSS). IEEE, 2024. https://doi.org/10.1109/ingarss61818.2024.10984003.

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Geetha, M., R. C. Suganthe, R. S. Latha, R. Anju, K. Sastimalar, and P. Shobana. "Deep Learning Based Yield Prediction Model To Predict The Yield of Paddy In Cauvery Delta Region." In 2022 International Conference on Computer Communication and Informatics (ICCCI). IEEE, 2022. http://dx.doi.org/10.1109/iccci54379.2022.9740944.

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Geetha, M., R. C. Suganthe, S. K. Nivetha, R. Anju, R. Anuradha, and J. Haripriya. "A Time-Series Based Yield Forecasting Model Using Stacked Lstm To Predict The Yield Of Paddy In Cauvery Delta Zone In Tamilnadu." In 2022 First International Conference on Electrical, Electronics, Information and Communication Technologies (ICEEICT). IEEE, 2022. http://dx.doi.org/10.1109/iceeict53079.2022.9768441.

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