Journal articles: '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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7

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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9

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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10

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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Surveys were conducted to explore the eulophid fauna in rice ecosystems of Tamil Nadu during 2015-16 in three different rice-growing zones viz., western zone, Cauvery delta zone and high rainfall zone. 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. Alpha and beta diversity were computed for the three zones and the diversity indices (Simpson’s index, Shannon-Wiener index, Pielou’s index) revealed that the high rainfall zone was the most diverse zone, while the western zone being the least. Aprostocetus benazeer Narendran was found to be the most abundant species in the rice ecosystem with a relative density of 12.4 per cent. On comparing the species similarities using the Jaccard’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.

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Mahendran, Dr G. "The Economic Dimension of Labour Migration Cauvery Delta Zone in Tamil Nadu, India." International Journal for Research in Applied Science and Engineering Technology 9, no. 12 (2021): 1149–53. http://dx.doi.org/10.22214/ijraset.2021.39463.

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Abstract: Majority are international migrant and interstate migrants, majority (75%) of the respondents in the age groups (21 to 40) migrated to different places like Thiruppur, Coimbatore, Chennai, Kerala and Saudi, Arabia, Dubai, Mascot, Malaysia, and Singapore. Main reasons for migration are low wages, unemployment debt due to failure in agriculture due to lack of rains, more employment opportunities in the destination place and more jobs and a handsome salary which leads to improvement of the living conditions.Such pull and push factors encourage emigration to high-income countries experiencing labour shortages. Emigration has different impacts on sending country and destination country. Low wages and rain-fed agriculture in the native place have been found the economic factors leading to migration, while poverty, poor civic amenities, leading a poor life, high aspirations and demonstration effect were social and psychological factors resulting to migration. Lesser storage of water in delta region consequent on insufficient rainfall in the catchment area does not allow the farmers to Cauvery Delta Zone. Keywords: Labor migration, Employment, income and Cauvery Delta Zone

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12

Saravanan, A., V. Velu, and K. M. Ramanathan. "Ammonia Volatilization Loss in Rice Soils of Cauvery Delta." International Rice Research Newsletter 12, no. 4 (1987): 59–60. https://doi.org/10.5281/zenodo.7123231.

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This article 'Ammonia Volatilization Loss in Rice Soils of Cauvery Delta' appeared in the International Rice Research Newsletter series, created by the International Rice Research Institute (IRRI). The primary objective of this publication was to expedite communication among scientists concerned with the development of improved technology for rice and for rice based cropping systems. This publication will report what scientists are doing to increase the production of rice in as much as this crop feeds the most densely populated and land scarce nations in the world.

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Sathyamoorthy, N. K., R. Jagannathan, and A. P. Ramaraj. "Rainfall Profile of Cauvery Delta Zone of Tamil Nadu." Current World Environment 11, no. 2 (2016): 524–30. http://dx.doi.org/10.12944/cwe.11.2.21.

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Thanjavur and Nagapattinam districts of Cauvery Delta Zone (CDZ) depend on canal irrigation for agriculture and are subjected to the vagaries of monsoon. This creates water crisis and affects agriculture of the region considered as rice bowl of Tamil Nadu. This necessitated the study of rainfall to plan and mitigate water scarcity. Rainfall data from Adhirampattinam, Aduthurai stations of Thanjavur district (Inland) and Nagapattinam station (Coastal area of Nagapattinam district) were utilized for the study. Normal rainfall of CDZ is 956 mm; Nagapattinam receives highest (1350 mm) and aduthurai (994 mm) recorded lowest. November is the wettest month for all locations while driest month differs among locations. Northeast monsoon (NEM) was considered as stable monsoon for CDZ as could be seen from the seasonal mean of 641 mm, 620 mm and 919 mm recorded by Adhirampattinam, Aduthurai and Nagapattinam, respectively. Trend analysis of seasons revealed that Adhirampattinam and Nagapattinam follow a decreasing trend for rainfall and rainydays during NEM and Southwest monsoon (SWM), with an increasing trend for Hot weather period (HWP) and Cold weather period (CWP). An interesting deviation is that Aduthurai recording an increasing trend for NEM while it followed same trend for HWP and SWM.

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Selvaraj, Selvakumar, Venkadesh Samykannu, Boomiraj Kovilpillai, and Rajarathinam Palanivel. "Google earth engine based assessment of soil loss using the RUSLE Model: A study of Cauvery Delta Zone, Tamil Nadu, India." INTERNATIONAL JOURNAL OF PLANT SCIENCES 18, RAAAHSTSE (2023): 33–36. http://dx.doi.org/10.15740/has/ijps/18.raaahstse/33-36.

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Tamil Nadu is very susceptible to soil erosion due to its deforestation, urbanization, complicated terrain and heavy rainfall. The objective of this study was to estimate soil erosion in the Cauvery-delta zone (CDZ) of Tamil Nadu, India, using the Revised Universal Soil Loss Equation (RUSLE) model in Google Earth Engine (GEE) platform. The GEE environment provides a faster and better method for spatial output maps. Several parameters including runoff-rainfall erosivity factor (R), soil erodability factor (K), topographic factor (LS), cropping management factor (C), and support practice factor (P) takes into consideration for RUSLE model. The result revealed that the annual average soil loss within the Cauvery delta zone is approximately 49.08 t/hac/year (metric tonne per hectare per year). The study area has a 45 % very high erosion risk, 42.6 % severe erosion risk, and 8.4 % high risk. Other erosion risk classes, such as slight and moderate erosion, accounted for 3 % and 1 % of the total area, respectively. The results of the study indicate that GEE allow targeted solution to reduce future soil erosion.

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Ponnudurai, Gurusamy, Natarajan Rani, Balan Rubinibala, Alagarsamy Alagesan, and Ramasamy Saravanan. "Detection of Theileria and Anaplasma spp. in carrier buffaloes (Bubalus bubalis) by polymerase chain reaction in Tamil Nadu, India." Buffalo Bulletin 41, no. 4 (2022): 571. http://dx.doi.org/10.56825/bufbu.2022.4143426.

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A total of 150 heparinised blood samples and equal number of blood smears were collected from buffaloes in three agro-climatic zones of Tamil Nadu viz., Cauvery delta, North - western and Southern zones to detect Theileria and Anaplasma by blood smear examination and Polymerase Chain Reaction. The blood smear examination revealed that none of animals were found to harbour any haemoprotozoan parasites. Whereas PCR detected Theileria and Anaplasma in 26.9% and 48.0%, and 10% and 15% of the animals, respectively in north- western zone and Cauvery delta, however no animal from south zone was detected positive for any protozoan. Besides, mixed infection of Theileria and Anaplasma was recorded in 8 (5.3%) animals. The analysis of data collected to determine the risk factors associated with occurrence of haemoprotozoan parasites revealed that the pure breed Murrah showed higher percentage of Theileria and Anaplasma positivity (30.7% and 46.1%) than non - descriptive breed (8.7% and 16.0%). The percentage of positivity of haemoprotozoan parasites was found to be higher among animals of 1 year, followed by 2 years and > 4 years of age.

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Selvaraj, Selvakumar, Venkadesh Samykannu, Boomiraj Kovilpillai, and Rajarathinam Palanivel. "Google earth engine based assessment of soil loss using the RUSLE Model: A study of Cauvery Delta Zone, Tamil Nadu, India." INTERNATIONAL JOURNAL OF PLANT SCIENCES 18, no. 2 (2023): 158–61. http://dx.doi.org/10.15740/has/ijps/18.2/158-161.

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Tamil Nadu is very susceptible to soil erosion due to its deforestation, urbanization, complicated terrain and heavy rainfall. The objective of this study was to estimate soil erosion in the Cauvery-delta zone (CDZ) of Tamil Nadu, India, using the Revised Universal Soil Loss Equation (RUSLE) model in Google Earth Engine (GEE) platform. The GEE environment provides a faster and better method for spatial output maps. Several parameters including runoff-rainfall erosivity factor (R), soil erodability factor (K), topographic factor (LS), cropping management factor (C), and support practice factor (P) takes into consideration for RUSLE model. The result revealed that the annual average soil loss within the Cauvery delta zone is approximately 49.08 t/hac/year (metric tonne per hectare per year). The study area has a 45 % very high erosion risk, 42.6 % severe erosion risk, and 8.4 % high risk. Other erosion risk classes, such as slight and moderate erosion, accounted for 3 % and 1 % of the total area, respectively. The results of the study indicate that GEE allow targeted solution to reduce future soil erosion.

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D Hebsiba Beula. "An Analysis of Crop Insurance as an Adaptation Tool of Climate Vulnerability in Cauvery Delta Zone." Communications on Applied Nonlinear Analysis 31, no. 2s (2024): 664–75. http://dx.doi.org/10.52783/cana.v31.694.

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Using the Climate Vulnerability Index (CVI), this study investigates the efficacy of crop insurance as an adaptation strategy for reducing climate vulnerability in the Cauvery Delta Zone. The effects of climate change, such as increased temperatures, changed precipitation patterns, and extreme weather events, are particularly vulnerable to the region's agriculture. In order to create a composite Climate Vulnerability Index (CVI) score, indicators such as Rainfall, Paddy Production, Cultivated Land, and Insured Land are normalised. Our assessment of crop insurance concentrated on how it can improve adaptive capacity by offering monetary protection against crop failures are induced by climate change. The findings demonstrate crop insurance's important role in boosting resilience by showing a considerable reduction in the CVI. In order to reduce climate risks and promote sustainable agriculture in the Cauvery Delta Zone (CDZ), this study emphasises the significance of incorporating crop insurance into more comprehensive adaption measures. A five-year data collection covering the fiscal years 2018–2019 through 2022–2023 was considered for this study from the Government of India's Directorate of Economics & Statistics.

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K. Revathi, G., B. Amudhambigai, V. Narmadha, and T. Poornima. "Identification of Social Problems of Farmers Using Fuzzy Mathematics." International Journal of Engineering & Technology 7, no. 4.10 (2018): 624. http://dx.doi.org/10.14419/ijet.v7i4.10.21297.

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In this article the reasons behind farmers suicide in Cauvery Delta Zone in Tamil Nadu a state in India were collected and analyzed through fuzzy sets and fuzzy logic. A fuzzy model was developed to identify the factor which causes the excessive stress on farmers to commit suicide. Finally some valuable suggestions towards the welfare of farmers also provided.

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K., Susmitha, Velmurugan D., Sita Devi K., and Babu S. "Mapping Climatic Vulnerability in Cauvery Delta Region of Tamil Nadu." Environment and Ecology 43, no. 1A (2025): 185–89. https://doi.org/10.60151/envec/vgie8642.

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Climatic vulnerability is an emerging concept for understanding the impacts of climate change and its policy implications. It refers to the degree to which a system is susceptible to, or unable to cope with, the adverse effects of climate change, including climate variability and extremes. Climate change significantly impacts agriculture, causing damage to crop productivity, food security, and economic stability. In India, about 80% of the population resides in highly vulnerable districts. The southern part of India is particularly susceptible to extreme climate events. This study attempts to map the vulnerability of the Cauvery Delta Region in Tamil Nadu using the Composite Vulnerability Index (CVI) and to classify districts into categories ranging from highly vulnerable to least vulnerable. The results of the study identify district as the most vulnerable, Cuddalore with a CVI of 0.65, followed by Nagapattinam (CVI: 0.52), Thiruvarur (CVI: 0.49), Perambalur (CVI: 0.44), Ariyalur (0.36). Pudukkottai and Tiruchirappalli (CVI: 0.34 each) and Thanjavur (CVI: 0.32) are categorized as less vulnerable districts. This classification is crucial for planning effective remedial measures to mitigate the impacts of climate change and enhance the resilience of the region.

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Bama, K. Sathiya, K. R. Babu, R. Sharmila, and A. Anuradha. "Influence of nitrogen application on direct seeded rice in old and new Cauvery Delta zone of Tamil Nadu, India." Journal of Applied and Natural Science 13, no. 4 (2021): 1462–69. http://dx.doi.org/10.31018/jans.v13i4.3095.

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Direct seeded rice is a boon to farmers where the water release from the reservoir is delayed. Nitrogen fertiliser management is one of the strategies bto rectify the nutrient-related issue in Direct seeded rice. The present study aimed to optimize the nitrogen dose for direct-seeded rice in the new and old Cauvery delta zone of Tamil Nadu. Field experiments were conducted during kuruvai and samba seasons at Tamil Nadu Rice Research Institute, Aduthurai and Agricultural research station Thanjavur representing old and new Cauvery delta regions during 2019-20 and 2020-21. Totally from eight experiments, the results of four field experiments in each location revealed the highest grain yield in the treatment T6 -application of 150 kg Nha-1 (5596kg/ha) which was statistically on par with treatment T5 -125kg N/ha (5326 kg/ha) in old delta and new delta. The higher grain yield was recorded in the T6 (5140 kg/ha), statistically on par with T5 (4550 kg/ha). The higher available nitrogen content of 312 kg/ ha,292 kg/ha was recorded for N application @ 150kg/ha, which was statistically on par with 309 kg/ha and 289 kg/ha, respectively, both the kuruvai and samba seasons for N application of 125 kg/ha. In the new CDZ, the same trend was followed as that of the old delta. Based on economics, N applied @125 kg/ha recorded a higher BC ratio for direct-seeded rice. For the benefit of farmers of both deltaic regions, the nitrogen application of 125 kg ha-1 for direct-seeded rice is recommended.

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Porchelvi, R. Sophia, and P. Selvavathi. "An Assessment of Drinking Water Quality in Cauvery Delta Region and Palar Region, Tamil Nadu." Scholedge International Journal of Multidisciplinary & Allied Studies ISSN 2394-336X 3, no. 12 (2017): 238. http://dx.doi.org/10.19085/journal.sijmas031201.

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Delta regions of the Cauvery River basin are one of the significant areas of rice production in India. In spite of large-scale utilization of the river basin for irrigation and drinking purposes, the lack of appropriate water management has seemingly deteriorated the water quality due to increasing anthropogenic activities. Vellore is the second most populous district of Tamil Nadu in India where the Palar River flowing towards east for about 295 Km. Vellore is surrounded by many leather tanneries and small scale dying industries and their effluents are discharged into the Palar river causing impact on the quality of the underground water. To assess the extent of deterioration, physicochemical characteristics of surface water were analyzed select regions of Cauvery Delta River basin and Palar region, Tamil Nadu, during March 2016 to May 2016. This study aimed to examine quality of drinking groundwater. The results represented whether the water was suitable or unsuitable for drinking purposes in this area. It was also observed that some areas like Tiruvarur, Needamangalam, Kamalapuram, Arcot, Soraiyur, Ranipet had low quality drinking water. It is suggested to take some necessary measures for supplying desirable water to the people living in these areas.

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Prabha, A. C. Surya, A. Rajkamal, M. Senthivelu, and S. Pragadeesh. "Soil Characteristics of Casuarina, Eucalyptus, Melia and Teak Plantations in Tamil Nadu, India." Ecology, Environment and Conservation 30, Suppl (2024): S124—S130. http://dx.doi.org/10.53550/eec.2024.v30i04s.022.

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Soil is the major source of nutrients for the growth of plants and determining the degree of soil physicochemical characteristics are very necessary to evaluate the soil fertility. The present investigation was conducted to study the soil properties of important plantations in the Cauvery delta zone of Tamil Nadu. The tree species selected for the study were Casuarina, Eucalyptus, Melia and Teak. Composite soil samples were collected from the selected plantations at three different depths; i.e., 0-15, 15-30 and 30-45 cm. The maximum OC (0.69 %) was recorded in Casuarina clonal plantation (CH-5) of > 5 years at 0-15 cm depth. The mean soil pH in selected plantations of the Cauvery delta zone varied from 5.96 ± 0.08 to 7.40 ± 0.08. Nitrogen availability (307.57 kg ha-1) and potassium availability (339.57 kg ha-1) was maximum in >5 years of Casuarina clonal plantation (CH-5). The available phosphorus content was high in the surface soils (0-15 cm) of >6 years of E. camaldulensis (26.31 kg ha-1). The study has contributed to the understanding of the soil properties in different plantation species of clonal and seedling origin in Tamil Nadu.

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Suganya, S. "Response of chilli to drip irrigation on sandy clay loam soil under Madukkur soil series (Typic ustropept) in cauvery New Delta Zone." INTERNATIONAL JOURNAL OF AGRICULTURAL SCIENCES 17, AAEBSSD (2021): 215–21. http://dx.doi.org/10.15740/has/ijas/17-aaebssd/215-221.

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In Tamil Nadu, one of the most important agro-climatic zone dictating the total rice production is by Cauvery Delta zone. In Cauvery Delta zone the area under rice cultivation has been reduced drastically and this situation forms the base for a paradigm shift from rice cultivation to alternate crops that requires less amount of irrigation water. Suitable alternate cropping pattern plays an important role in improving the purchasing power of farmer with the help of inclusion of commercial crops in rice based cropping system. Chilli is an important spice cum vegetable crop cultivated extensively in India. This project is indented to study the fertigation system in one of promising alternate crops in chillies in rice ecosystem. By keeping all these points in view, the present investigation was undertaken to study the response of chilli to drip irrigation on sandy clay loam soil under Madukkur soil series (Typic Ustropept) in cauvery new delta zone. Field experiment was conducted at Soil and Water Management Research Institute, Kattuthottam, Thanjavur financially supported by Department of Science and Technology under SERB programme with a budget outlay of Rs. 13.0 lakhs for three years during 2012-2015 in strip plot design with four replications. The results revealed that Sub surface drip fertigation at 10 cm depth recorded the maximum plant height, number of branches, number of flowers and number of fruits at B2 irrigation regime (IW/CPE = 0.75). Total green chillies yield was higher under sub surface drip fertigation @ 10 cm depth at IW/CPE=1 (15.59 t ha-1) followed by surface drip fertigation at IW/CPE = 0.75 (13.50 t ha-1) and sub surface drip fertigation @ 10 cm depth at IW/CPE = 0.75 (11.17 t ha-1).Thus, introduction of chillies as an alternate crop under sub surface drip fertigation @ 10 cm depth technology during January under Broad bed furrow method of cultivation paves the way for improving the social security to the rice farmers.

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Arumugam, Surendran, Ashok K.R., Suren N. Kulshreshtha., Isaac Vellangany, and Ramu Govindasamy. "Yield variability in rainfed crops as influenced by climate variables." International Journal of Climate Change Strategies and Management 7, no. 4 (2015): 442–59. http://dx.doi.org/10.1108/ijccsm-08-2013-0096.

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Purpose – This paper aims to explore the impact of climate change on yields and yield variances in major rainfed crops and measure possible changes in yields under projected climate changes in different agro-climatic zones of Tamil Nadu, India. Although many empirical studies report the influence of climate change on crop yield, only few address the effect on yield variances. Even in such cases, the reported yield variances were obtained through simulation studies rather than from actual observations. In this context, the present study analyzes the impact of climate change on crops yield and yield variance using the observed yields. Design/methodology/approach – The Just-Pope yield function (1978) is used to analyze the impact of climate change on mean yield and variance. The estimated coefficient from Just-Pope yield function and the projected climatic data for the year 2030 are incorporated to capture the projected changes in crop yield and variances. Findings – By the year 2030, the yield of pulses is estimated to decline in all the zones (Northeast, Northwest, Western, Cauvery delta, South and Southern zones), with significant declines in the Northeast zone (6.07 per cent), Cauvery delta zone (3.55 per cent) and South zone (3.54 per cent). Sorghum yield may suffer more in Western zone (2.63 per cent), Southern zone (1.92 per cent) and Northeast zone (1.62 per cent). Moreover, the yield of spiked millet is more likely to decrease in the Southern zone (1.39 per cent), Northeast zone (1.21 per cent) and Cauvery delta zone (0.24 per cent), and the yield of cotton may also decline in the Northeast zone (12.99 per cent), Northwest zone (8.05 per cent) and Western zone (2.10 per cent) of Tamil Nadu, India. Originality/value – The study recommends introducing appropriate crop insurance policies to address possible financial losses to the farmers. Prioritizing area-specific stress-tolerant crop varieties without complementing yield would sustain crops cultivation further.

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Logesh, V., M. Ramasubramanian, M. A. Vennila, C. Karthikeyan, and M. Prahadeeswaran. "An Analysis of Constraints Faced by Organic Farmers in the Cauvery Delta Zone of Tamil Nadu, India." International Journal of Environment and Climate Change 13, no. 10 (2023): 888–95. http://dx.doi.org/10.9734/ijecc/2023/v13i102733.

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Aim: This study examines the multifaceted challenges encountered by organic farmers operating within the Cauvery Delta Region of Tamil Nadu. Study Design: Ex-post facto research design was used to investigate and reveal the challenges that organic farmers have encountered over the preceding years. Place and Duration of Study: The study was conducted in the Cauvery Delta Zone of Tamil Nadu. Five districts were selected for the study namely, Thanjavur, Thiruvarur, Nagapattinam, Mayiladuthurai and Tiruchirapalli. Respondents were interviewed during the period of June 2023 – July 2023. Methodology: The study aimed to include 40 organic farmers from each district, resulting in a collective sample size of 200 respondents across these districts, facilitated through snowball sampling technique. A well – structured interview schedule which included the major constraints faced by organic farmers of the CDZ was developed based on review of past literatures and discussion with experts in the area of organic farming. Based on the ranks given by the respondents to the constraints, the data was analyzed and conclusive results were obtained using the Rank Based Quotient (RBQ) technique. Constraints were studied in 7 different dimensions namely, labour, technical, service and supply, credit and economic, environmental, cropping and marketing constraints.  Results: The prime constraints with a higher RBQ values identified in these dimensions were, Labour scarcity due to MGNREGA (93.13), Cumbersome (Slow and complicated) certification process (79.90), Lack of supportive institutions for organic farming (91.80), Inadequate subsidies for organic agriculture (92.75), Use of polluted river water for irrigation (93.90), Lack of inputs specifically for weed management (96.63), Challenge in finding proper marketing channel (90.38). In addition to this, some minor issues were also identified as constraints in the study area. Conclusion: Through an in-depth exploration of these challenges, the study aims to provide insights that can guide policy makers, practitioners, and stakeholders in devising strategies to overcome the obstacles faced by organic farmers in the Cauvery Delta Zone which could have a threshold effect in boosting up the organic productivity of the state.

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R, KAVIMANI, VIJAYABASKARAN S, and AROKIA RAJ A. "WEED DYNAMICS IN RICE BASED CROPPING SEQUENCE IN CAUVERY DELTA ZONE." Madras Agricultural Journal 85, December (1998): 508–10. http://dx.doi.org/10.29321/maj.10.a00784.

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Experiments conducted in a farmer's field with clay loam soil in Cauvery delta zone during 1993 and 1995 revealed that broad leaved weeds constituted the major weed flora followed by grasses and sedges in rice grown during thaladi season and in relay sown blackgram. In case of sesame, either sown immediately after rice or after blackgram or after a fallow period, grasses dominated the weed flora followed by broad leaved weeds and sedges.

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R, VAITHILINGAM, KALAIMANI S, and NATARAJAMOORTHY C. "ADT 1: A NEW SOYBEAN VARIETY FOR CAUVERY DELTA RICE - FALLOW CULTIVATION." Madras Agricultural Journal 82, December (1995): 621–23. http://dx.doi.org/10.29321/maj.10.a01279.

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A culture UGM 33, is a pureline selection from 'Hill'. It was high yielding under 'Cauvery delta rice- fallow cultivation and released as ADT 1. It possesses erect, compact and medium plant stature (70 cm), with cream coloured seeds, 2 to 3 in a pod with velvetty hairs. The duration is 85- 90 days. Main yield is 1274 kg/ha. Seeds contain 30% protein and 29% oil and no beany flavour.

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Prabakar, C., K. Sita Devi, S. M. Suresh Kumar, P. Stalin, and R. Singaravel. "Remodelling of Existing Cropping System towards Risk Optimization in Cauvery Delta Zone of Tamil Nadu." Environment and Ecology 42, no. 4C (2024): 2117–30. https://doi.org/10.60151/envec/ryfp8787.

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This study explores the challenges faced by farmers in the cauvery delta zone of Tamil Nadu, an area highly vulnerable to drought and flooding. The traditional reliance on mono-cropping, especially paddy, has made farmers more susceptible to risks posed by uncertain water availability and climate variability. The study aims to develop a risk-optimized, crop-diversified alternative cropping system using the Minimization of Total Absolute Deviation (MOTAD) model. Through a stratified random sampling, 600 farmers were selected across five agronomically and socio-economically homogeneous village clusters, to capture the diversity of cropping patterns and irrigation sources. The results revealed that, the degree of farm-level crop diversification was much low in the study area. The MOTAD model integrates risk considerations into farm planning by balancing profit maximization and risk minimization. The findings suggest alternative cropping systems, which include combinations of Paddy, Banana, Coconut-Pepper and low-water-intensive crops such as Brinjal, Bhendi, Maize, Cotton, Marigold and Tuberose. The findings emphasize the need for awareness among farmers about crop diversification as a risk mitigation strategy and suggest that agricultural extension agencies should promote the adoption of these diversified cropping systems. By evolving cluster-specific cropping plans, the study proposes a sustainable approach to enhance the resilience of farming in the Cauvery delta zone.

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Tamilmounika, R., S. Pazhanivelan, K. P. Ragunath, et al. "Paddy area estimation in Cauvery Delta Region Using Synthetic Aperture Radar." Ecology, Environment and Conservation 28, no. 01s (2022): 69. http://dx.doi.org/10.53550/eec.2022.v28i01s.069.

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Chander, Mahesh, MS Kannadhasan, and D. Bardhan. "Migratory Sheep Farming Practices in Cauvery Delta Zone in Tamil Nadu." INDIAN JOURNAL OF VETERINARY SCIENCES AND BIOTECHNOLOGY 16, no. 01 (2020): 62–65. http://dx.doi.org/10.21887/ijvsbt.16.1.14.

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Migratory sheep, due to its movement, poses threat of spreading diseases among small ruminants. Considering this, the study was carried out to identify the focus area of extension intervention among the migratory sheep farmers to disseminate scientifically recommended practices which minimize disease risk and enhance flock health. The study was conducted following ex post fact research design at Venganur village, Cuddalore district, Tamil Nadu. Using a semi-structured interview schedule, data were personally collected from 30 migratory sheep farmers who were selected purposively. The findings were subjected to focussed group interview involving seven farmers. The results envisaged a wider difference among the farmers from 100 per cent non-adoption of balanced ration to 100.00 per cent adoption of deworming. Therefore, extension interventions need to be intensified to educate the farmers on technologies which help in disease prevention and control.

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Vignesh Kumar, S., and C. Karthikeyan. "Farmers’ Distress in Cauvery Delta Region of Tamil Nadu - An Analysis." Madras Agricultural Journal 104, no. 10-12 (2017): 381. http://dx.doi.org/10.29321/maj.2017.000083.

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E. Tamileniyan, A. Latchumikanthan, K. Thilagavathi, and R. Velusamy. "A REPORT ON MIXED INFECTIONS OF ACUARIA HAMULOSA, HETERAKIS GALLINARUM AND HOLOMENOPON LEUCOXANTHUM IN NATIVE DUCKS OF CAUVERY DELTA REGION OF TAMIL NADU." Indian Journal of Veterinary and Animal Sciences Research 54, no. 3 (2025): 74–81. https://doi.org/10.56093/ijvasr.v54i3.167851.

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Post mortem examination of two duck carcasses revealed the presence of worms in the gizzard and caecum. The worms from gizzard were identified as Acuaria hamulosa and caecal worm were identified as Heterakis gallinarum based on the morphological features. In addition, lice were collected from the feathers and identified as Holomenopon leucoxanthum. This study reports the occurrence of Acuaria hamulosa, Heterakis gallinarum and Holomenopon leucoxanthum in native ducks from Cauvery delta region of Tamil Nadu.

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Sabarisakthi, M. "An Exploration on Farm Crisis and Suicides in the Cauvery Delta Districts of Tamil Nadu." Shanlax International Journal of Economics 7, no. 4 (2019): 84–90. http://dx.doi.org/10.34293/economics.v7i4.646.

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The Cauvery delta is the most productive food bowls in India and which cultivates more than 70 percent of paddy in Tamil Nadu. However, the situation of farmers suicides is alarming and leading to farm suicides manifested from the fragile situation during 2017, since farmer suicides are rare in this region. In this context, this study is taken-up and used descriptive research design with both primary and secondary data source. Empirical data have been collected from the 21 victim farmers’ households of three Cauvery districts of Thanjavur, Thiruvarur, and Nagapattinam. The empirical research found several causes: the scarcity of water and drought are the major causes of the present agrarian crisis. It is reported that every victim farmers of the study area borrowed for crop cultivation and unable to repay the borrowings on time due to crop failure. The victim farmers are disappointed by the crop failure, agriculture policies, and schemes are failed to compensate for their needs. Thus, safety net measures like crop insurance and allowances may be provided as immediate relief from debts. Intensive counseling at the household level is another intervention, which may reduce the suicides immediately. Local educational institutions and their community service wings may be utilized for educating and counseling the distress farmers.

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Balasubramaniyan, P., and S. Sankaran. "Response of Selected Minikit Rice Varieties to Nitrogen and Tungro Virus (RTV) on the Cauvery Delta." International Rice Research Newsletter 11, no. 2 (1986): 5–6. https://doi.org/10.5281/zenodo.7121666.

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This article 'Response of Selected Minikit Rice Varieties to Nitrogen and Tungro Virus (RTV) on the Cauvery Delta' appeared in the International Rice Research Newsletter series, created by the International Rice Research Institute (IRRI). The primary objective of this publication was to expedite communication among scientists concerned with the development of improved technology for rice and for rice based cropping systems. This publication will report what scientists are doing to increase the production of rice in as much as this crop feeds the most densely populated and land scarce nations in the world.

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Budhar, M. N., S. Palanisamy, and A. A. Kareem. "Simulation of Yield Potential of Rice Varieties in Cauvery Delta Zone, Tamil Nadu." International Rice Research Newsletter 16, no. 2 (1991): 11. https://doi.org/10.5281/zenodo.7218172.

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This article 'Simulation of Yield Potential of Rice Varieties in Cauvery Delta Zone, Tamil Nadu' appeared in the International Rice Research Newsletter series, created by the International Rice Research Institute (IRRI). The primary objective of this publication was to expedite communication among scientists concerned with the development of improved technology for rice and for rice based cropping systems. This publication will report what scientists are doing to increase the production of rice in as much as this crop feeds the most densely populated and land scarce nations in the world.

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Sundharavadivu, S., and K. Ghadei. "Farmers Knowledge on Sri Technology in Cauvery Delta Region of Tamil Nadu." Journal of Global Communication 12, no. 1 (2019): 12. http://dx.doi.org/10.5958/0976-2442.2019.00003.x.

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S. KARTHICK and R. SAMINATHAN. "Problems of the Farmers in Marketing Paddy in Cauvery Delta Zone, Tamilnadu." Journal of Humanities and Social Sciences Studies 2, no. 6 (2020): 163–67. http://dx.doi.org/10.32996/jhsss.2020.2.6.18.

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Indian economy is essentially a rural economy. The very presence of monetary exercises of the whole individuals is bound up with the state and soundness of this area. In India, around 70% of individuals are occupied with horticultural interests and around 50% of the public pay starts from agribusiness. Henceforth the degree of effectiveness and profitability in horticulture pretty much decides the productivity of Indian economy. In India, individuals and their whole entirety are such a great amount of bound up with the fortunes of horticulture that the movement of life and the example of exercises do close to reflect all that occurs in this area. Since farming is the benefactor of the biggest measure of merchandise and enterprises to the improvement of the nation, it gets fundamental and dependable with respect to the Government to manage and control the promoting arrangement of Agricultural produce. Horticultural promoting in India is plagued with numerous deformities. "The rancher, when all is said in done, sells his produce at a troublesome spot and at an ominous time, and generally gets entirely horrible terms." So, in such conditions, it isn't unexpected to find that the horticultural makers as a class are being abused by the buyers.

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Rajakumari, Sambandan, Renganathan Mahesh, Kaladevi Jayadevan Sarunjith, and Ramachandran Ramesh. "Volumetric change analysis of the Cauvery delta topography using radar remote sensing." Egyptian Journal of Remote Sensing and Space Science 25, no. 3 (2022): 687–95. http://dx.doi.org/10.1016/j.ejrs.2022.06.003.

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S. JEYARAMAN and T. N. BALASUBRAMANIAN. "Cyclonic flood management for rice crop in Cauvery Delta Zone, Tamil Nadu." Journal of Agrometeorology 6, no. 1 (2004): 125–30. http://dx.doi.org/10.54386/jam.v6i1.723.

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Selvan, M. Tamil, S. Sumitha, A. Nithya Devi, H. P. Maheswarappa, and R. K. Mathur. "Performance of tenera oil palm hybrids in cauvery delta region of India." Indian Journal of Horticulture 79, no. 1 (2022): 76–80. http://dx.doi.org/10.5958/0974-0112.2022.00012.3.

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Senthil, R., G. Senthil Kumar, A. Serma Saravana Pandian, and Thanga Thamil Vanan. "Economic efficiency of goat farming in cauvery delta zone of Tamil Nadu." Indian Journal of Small Ruminants (The) 28, no. 1 (2022): 170–76. http://dx.doi.org/10.5958/0973-9718.2022.00028.9.

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Ragunath Kaliaperumal, Sugavaneshwaran Kannan, S. Pazhanivelan R. Kumaraperumal, and K. Sivakumar. "Rice Area Estimation using Sentinel 1A SAR Data in Cauvery Delta Region." International Journal of Current Microbiology and Applied Sciences 10, no. 2 (2021): 848–53. http://dx.doi.org/10.20546/ijcmas.2021.1002.100.

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Theodore, Ravi Kumar, N. Venkatesa Palanichamy, and V. Ravi. "Impact Assessment of Mechanical Transplantation in Cauvery Delta Districts of Tamil Nadu." JOURNAL OF EXTENSION EDUCATION 29, no. 4 (2018): 5945. http://dx.doi.org/10.26725/jee.2017.4.29.5945-5957.

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Senthil, R. "Constraints in Backyard Goat Farming in Cauvery Delta Zone – The Farmers’ Perception." International Journal of Pure & Applied Bioscience 6, no. 5 (2018): 990–94. http://dx.doi.org/10.18782/2320-7051.5378.

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Jagadeesan, K., AS Selvaramesh, and P. Vijayakumar. "A field survey of prevalence of Umblachery bullocks in Cauvery delta zone." International Journal of Veterinary Sciences and Animal Husbandry 9, no. 4 (2024): 224–26. http://dx.doi.org/10.22271/veterinary.2024.v9.i4d.1548.

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Ahmad, Malik Zubair, and Pramod Singh. "REE geochemistry of core sediments of Cauvery delta, India for provenance studies." Acta Geochimica 39, no. 4 (2019): 512–26. http://dx.doi.org/10.1007/s11631-019-00379-1.

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Sujatha, V., C. Suresh, and M. Saminathan. "Prevalence of subclinical ketosis in eastern cauvery delta region of Tamil Nadu." Journal of Immunology and Immunopathology 25, no. 1 (2023): 33–36. http://dx.doi.org/10.5958/0973-9149.2023.00005.9.

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S., Vallal Kannan. "Compendium for Mechanised Direct Sown Rice Cultivation in Cauvery New Delta Zone." Madras Agricultural Journal 103, June (2016): 110–13. http://dx.doi.org/10.29321/maj.10.001001.

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Shortages of labour, water and the adverse effects of puddled soil health are forcing farmers to switch from puddled transplant to alternate rice production system. The experiment results showed that sowing of seed @ 40kg ha-1 by multi crop planter (Happy seeder) under dry condition. Alternate wetting and drying (AWD) method of irrigation along with the fertilizer dose of 120:50:50 NPK kg ha-1 , weed management by the application of Pretilachlor @ 0.45 l ha-1 on 5 DAS and two machine weeding on 30 and 45 DAS had recorded the highest establishment percentage, optimum number of productive tillers, the highest number of grains per panicle, the highest grain yield (8.16 t ha-1 ), net income (74,477 Rs ha-1 ), BCR(3.80) and the highest water use efficiency (0.58 kg ha-1mm-1 ). Sowing of seed @ 40 kg ha-1 by multi crop planter (Happy seeder) under dry condition and AWD method of irrigation is important to achieve higher establishment percentage, higher production of grain and straw yield, BCR and WUE. Lesser weed density, higher weed control efficiency and higher plant height was achieved under continuous submerged irrigation. Similarly, increase in seed rate reduced the weed density and increased the weed control efficiency.

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A.C., Surya Prabha, Velumani R., Senthivelu M., Arulmani K., and Pragadeesh S. "Soil organic carbon assessment under different land uses in Cauvery delta zone of Tamil Nadu, India." Journal of Applied and Natural Science 12, no. 4 (2020): 478–83. http://dx.doi.org/10.31018/jans.v12i4.2372.

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Soil organic carbon (SOC) plays a vital role in soil fertility and is important for its contributions to mitigation and adaptation to climate change. The present study was undertaken to estimate the SOC stock in soils under different land uses of Cauvery Delta zone of Tamil Nadu. Four different land uses were selected for the study viz, Forests, Agriculture, Agro-forestry and Plantations. Soil samples were collected from Madukkur and Kalathur soil series of Cauvery Delta zone for soil carbon analysis. The soil samples were fractionated into three aggregate size classes viz., macro-aggregates (250-2000µm), micro-aggregates (53-250 µm) and silt and clay sized fraction (<53 µm). At 0-30 cm depth, the forest land use stored the maximum SOC stock in the different size fractions viz. macro-sized fraction (73.0 Mg ha-1), a micro-sized fraction (76.0 Mg ha-1) and silt+clay sized fraction (77.0 Mg ha-1) in Madukkur series. Agriculture land use registered the lowest SOC stock. Among the different size fractions, silt+clay sized fraction (< 53 µm) retained the maximum SOC in all the land uses. In Kalathur series also, maximum soil organic carbon stock was recorded in forest land use. The data generated in the study will be beneficial to the user groups viz., farmers in identifying the most suitable land use for enhancing the storage of soil organic carbon thereby improving yields of crops and trees.

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N, RAJU, RAJENDRAN R, ABDUL KAREEM A, and RANGANATHAN T.B. "POPULATION TRENDS OF RICE GREEN LEAFHOPPERS IN CAUVERY DELTA ZONE OF TAMIL NADU." Madras Agricultural Journal 84, April (1997): 196–201. http://dx.doi.org/10.29321/maj.10.a00869.

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Peak occurrence of green leafhoppers (GLH) was observed during September and October months of the three years 1991 93. The species composition in light-trap and field collections revealed that Nephotettix virescens dominated over N. nigropictus. The seasonal incidence of GLH in the three defined seasons of Cauvery Delta Zone revealed that early planting of the crop in Kuruval season i... July 25 recorded low incidence of GLH than the late planted crop. The early as well as late planting of samba and thaladi season was susceptible to GLH. Among the weather factors. relative humidity and minimum temperature influenced the pest population.

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Journal articles on the topic 'Cauvery Delta'

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