Journal articles: 'Cauvery Delta Zone'

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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, 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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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Devadarshini, E., V. Geethalakshmi, S. Pazhanivelan, et al. "Insights into Rainfall Extremities Across the Agroclimatic Zones of Tamil Nadu, India." International Journal of Environment and Climate Change 13, no. 9 (2023): 3096–108. http://dx.doi.org/10.9734/ijecc/2023/v13i92552.

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Rainfall is a crucial agrometeorological parameter that impacts hydrology and agricultural planning in a region. The spatiotemporal changes in the occurrences of precipitation extremes must be monitored to reduce the hazards caused by the fluctuating rainfall pattern. The extreme rainfall indices for each year categorized under excess, normal and deficit rainfall categories were calculated over the agroclimatic zones of Tamil Nadu using the high-resolution CHIRPS datasets from 1991 to 2022. The results highlighted that High Rainfall Zone has more consecutive wet days (22 days), minimum consecutive dry days (25 days) and Daily Intensity Index with threshold of 2.5 mm (28.6 mm) compared to other zones. The maximum consecutive dry days of 99 days, a high rainy day of 142 days, and minimum daily intensity of 8.9 mm are experienced by the Cauvery Delta Zone, High Altitude and Hilly Zone, and Western Zone, respectively. Overall, the High Rainfall Zone faces a higher number of extreme rainfall events in terms of wet days and intensity, whereas the average maximum consecutive dry days and minimum rainfall intensity is observed over the north eastern zone and north western zone, respectively indicating high dry periods.

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Kumar, C. Arul, and G. Manimannan. "Spatial Pattern of Agriculture Productivity of Crops in Cauvery Delta Zone of Tamilnadu." IOSR Journal of Agriculture and Veterinary Science 7, no. 11 (2014): 01–07. http://dx.doi.org/10.9790/2380-071120107.

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Venkadesh, S., S. Pazhanivelan, K. P. Ragunath, R. Kumaraperumal, S. Panneerselvam, and R. Sathy. "Spatio-Temporal Analysis of Meteorological Drought in Cauvery Delta Zone of Tamil Nadu." International Journal of Current Microbiology and Applied Sciences 8, no. 06 (2019): 1356–63. http://dx.doi.org/10.20546/ijcmas.2019.806.164.

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Mohanraj, V., P. Balasubramaniam, and M. Senthilkumar. "Risk Behavior of Small and Marginal Farmers in Cauvery Delta Zone, Tamil Nadu." International Journal of Environment and Climate Change 13, no. 3 (2023): 134–42. http://dx.doi.org/10.9734/ijecc/2023/v13i31691.

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Farmers’ risk preferences play an important role in agricultural production decisions, risk takers means the farmers who are willing to take risky decisions in farming, risk aversion means an attitude of reluctance to take risky decisions in farming. Climatic change effects all regions across the globe and causes substantial agitations that can be expected to be natural systems that have foreseeable influences on the economic systems of upland regions through both direct and indirect means. Risk preferences reflect the farmers’ personal experiences and beliefs, these preferences explain how the decision-maker assesses and react to risks. This study characterizes risk behaviour among marginal and small farmers in Cauvery Delta Zone and determines how these risk preferences affects the farmers. The study was conducted in Cauvery Delta zone of Thanjavur, Thiruvarur and Nagapattinam districts with a Sample size of 366 farmers which consists of 183 marginal and 183 small farmers was selected randomly based on proportionate random sampling method. The risk behavior was measured by the measure of risk attitude and two lottery methods viz., Eckel-Grossman and Holt-Laury based lottery method. Measure of risk attitude results shows that, 27.60 per cent of farmers were moderate risk taker followed by 24.30 per cent were risk averser and 15.00 per cent of farmers were risk taker. The Eckel and Grossman lottery method result shows CRRA (Constant Relative Risk Aversion) value was 0.38 to 0.67, which shows that marginal farmers were risk aversers and small farmers were moderate risk takers. The CRRA adapted from Holt and Laury [1] range for the maximum was 1.37 and minimum -1.71 for their choices. The majority of marginal farmers were risk aversers, the socio-economic characteristics of the farmers decides the risk preference. The risk-averse farmer this may imply risk-taking behavior that is reduced by risk aversion (resulting in on-farm risk management strategies) and a reduced demand of insurance.

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C. Prabakar, K. Sita Devi, Y. Shelton Peter, G. Baradhan, R. Selva Kumar, and Chowdula Shireesha. "Crop Diversification - Its Status and Scope in Cauvery Delta Zone of Tamil Nadu." Ecology, Environment and Conservation 31, Suppl (2025): S54—S60. https://doi.org/10.53550/eec.2025.v31i02s.010.

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This paper explores the potential for crop diversification in the Cauvery delta region of Tamil Nadu, an area where monocropping of paddy dominates, leading to vulnerability in the face of climatic challenges such as drought and floods. The study aims to analyse the current level of crop diversification, the factors influencing farmers’ awareness on diversification, and the reasons for its limited adoption. A stratified random sampling technique was employed to gather data from 600 farmers across different districts. Various analytical tools, including the Herfindahl Index, Simpson Index, Markov Chain Analysis, Logit Model, and Garrett Analysis were used to assess the degree of diversification, shifts in cropping patterns, factors determining awareness on crop diversification, and reasons for non-adoption of crop diversification. The results show that crop diversification is at very minimal level, with paddy retaining a stronghold in the cropping system, despite risks associated with water scarcity and labour shortages. Age, Education, participation in agricultural extension meetings, and experiences with labour and water scarcity significantly influence farmers awareness on diversification. However, the main barriers to adoption include lack of awareness on alternative crops and fear of production failure. The findings highlight the importance of tailored interventions by agricultural extension agencies to encourage diversification in this climatevulnerable region.

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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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Soodamani, Arunprakash, and Paranidharan Vaikuntavasan. "Survey and Isolation of Rice False Smut Pathogen Ustilaginoidea virens (Cooke) Takahashi." International Journal of Plant & Soil Science 35, no. 20 (2023): 277–83. http://dx.doi.org/10.9734/ijpss/2023/v35i203808.

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Roving survey has been conducted during first quarter of 2023 at selected paddy fields of Cauvery Delta zone (Tanjore, Perambalur) and Western zone (Coimbatore, Erode) of Tamil Nadu to assess the Percent Disease Incidence for rice false smut disease in which the maximum disease incidence was recorded in Erode district (40%). The infected spikelet were observed with the characteristic symptoms where the individual rice grains turned into large, fluffy and velvety green balls, later these balls turns hard during maturity. The pathogen Ustilaginoidea virens was isolated from the infected smut balls in potato sucrose agar medium in which the fungus appears as small white colonies after seven days of isolation.

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T.M, THIYAGARAJAN, RANGANATHAN C.R, BHASKARAN A, MATHAN K.K, and KARIVARADARAAJU T.V. "Trends in rice area, production and productivity in the different agro climatic zones of Tamil Nadu." Madras Agricultural Journal 87, june (2000): 287–90. http://dx.doi.org/10.29321/maj.10.a00466.

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Rice grain production in Tamil Nadu had ranged from 3.33 million tonnes to 7.56 million tonnes during 1959-60 to 1996-97. The overall trend on rice production and productivity increased but the area under rice showed a decreasing trend. Rice area in the state was declining at an average rate of 22,900 ha-1 yr and the total rice grain production increased at an average of 84,600 1 yr. The North Eastern Zone, Cauvery Delta Zone and Southern Zone contributed to 87% of total rice production in the state with a standard deviation of 1.64%. The Western Zone, North Western Zone and High Rainfall Zone contributed to 12.8% Rice productivity (kg grain ha-1) in Tamil Nadu had shown an increasing trend at an average of 82 kg ha-1 yr. The overall mean of rice productivity was highest in the Western Zone (4.2 ha).

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Samykannu, Venkadesh, and Pazhanivelan S. "Validation of PERSIANN Precipitation Product Using TAWN Rain Gauge Network Over Different Agro-climatic Zones in Tamil Nadu." Madras Agricultural Journal 108, september (2021): 1–6. http://dx.doi.org/10.29321/maj.10.000513.

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Currently, several satellite-precipitation products were developed using multiple algorithms to estimate rainfall. This study carried out using Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks (PERSIANN) product over seven agro-climatic zones of Tamil Nadu during the northeast monsoon (NEM) season of October to December for 2015-2017 (three years) against 118 rain-gauges data of Tamil Nadu Agricultural Weather Network (TAWN). The performance compares aggregated seasonal scale of rainfall using continuous (CC, RMSE, and NRMSE) statistical approaches. It was observed that PERSIANN is accurate in the high-altitude hilly zone and the Cauvery delta zone. For 2015, 2016, and 2017, the correlation values were 0.77, 0.52, and 0.71, respectively. The highest RMSE value was measured for northeast zone (NEZ) during 2015 (222.17 mm), and the lowest was determined for 22.63 in the High-altitude hilly zone (HAHZ) during 2016 and NRMSE had less errors during all three seasons. The study concluded that the PERSIANN data set could be useful substitute for rain-gauge precipitation data.

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M, KUMAR, and CHANDRASEKARAN B. "ASSESSING THE PERFORMANCE OF Azolla microphylla IN DIFFERENT NON-SUPPLEMENTED SOIL SERIES SAMPLES." Madras Agricultural Journal 85, December (1998): 593–96. http://dx.doi.org/10.29321/maj.10.a00810.

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Among the different species of Azolla, Azolla microphylla performs well at this Cauvery Delta Zone (CDZ). An experiment initiated with an objective to assess the biomass production of Azolla microphylla in different soil series over weekly intervals revealed that the capacity of soil irrespective of soil series to buttress the growth of A. microphylla is only upto 23 weeks from the date of inoculation. Among the four soil series tested (Kalathur, Adhanur, Padugai and Alangudi), Kalathur series had supported higher biomass production owing to the medium P status.

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J. Kavipriya et al.,, J. Kavipriya et al ,. "A Scale to Measure Attitude of Farmers Towards Farm Diversification on Cauvery Delta Zone." International Journal of Agricultural Science and Research 9, no. 3 (2019): 137–42. http://dx.doi.org/10.24247/ijasrjun201921.

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Vijayabhama, M., K. Baranidharan, R. Ravikumar, and K. Divya. "Studies on growth attributes of Casuarina species in Cauvery delta zone of Tamil Nadu." International Journal of Farm Sciences 12, no. 1 (2022): 122–26. http://dx.doi.org/10.5958/2250-0499.2022.00028.3.

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Kavipriya, J., K. Mahandrakumar, J. S. Amarnath, and M. Prahadeeswaran. "An Extend of Farm Diversification in Cauvery Delta Zone - A Spatial and Temporal Analysis." International Journal of Current Microbiology and Applied Sciences 8, no. 05 (2019): 1257–63. http://dx.doi.org/10.20546/ijcmas.2019.805.143.

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Sivakumar, V., K. Kumanan, R. Balakumbahan, V. Alex Albert, and M. Alagar. "Assessment of cassava varieties in cauvery delta zone of Tamil Nadu for sustainable productivity." International Journal of Chemical Studies 8, no. 4 (2020): 3705–7. http://dx.doi.org/10.22271/chemi.2020.v8.i4au.10220.

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Angles, S., and K. R. Jahanmohan. "Impact of mechanization on rice fallow pulses in cauvery delta zone of Tamil Nadu." INTERNATIONAL JOURNAL OF PLANT SCIENCES 18, RAAAHSTSE (2023): 21–26. http://dx.doi.org/10.15740/has/ijps/18.raaahstse/21-26.

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The rice fallow pulses crop is one of the major crop in Thanjavur District of Tamil Nadu state, in recent years the area under rice fallow pulses are dwindling due to use of heavy machinery like combine harvesters and tractor mounted balers. Hence, this study was conducted with an objective to assess the impact of mechanization on the rice fallow pulse and to quantify the economic loss due to non-cultivation of rice fallow pulses. Multistage Stratified Random Sampling method was employed for drawing the 100 numbers of samples farm households from Kumbakonam and Orathanadu blocks of Thanjavur district.Among the various consequences, season skipping was the main consequence of heavy machinery usage in rice farming on pulses cultivation in both the study blocks. The reduction in yield of fallow pulses to the tune of more than 50 per cent was felt as the major impact of mechanization in rice farming. Farmers in both the study blocks have cited that the reduction in yield was the major impact which was due to sub optimal plant population due to use of combine harvesters and tractor mounted balers. Non-availability of labour and associated higher cost for labourers was the prime for preference of heavy machineries like combine harvesters and balers in rice farming. It is suggested for development of paddy harvesters specifically for the regions where rice fallow pulses were practices, promotion of irrigated pulses in alternate season and to extend the price incentive which would incentivize the farmers to bring more area under pulses crops.

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S, Mathiyazhagan, Jayasudha J, Venkatesh M, et al. "Productivity and economics of direct seeded rice in Cauvery delta zone of Nagapattinam district." International Journal of Agriculture Extension and Social Development 8, no. 1 (2025): 522–26. https://doi.org/10.33545/26180723.2025.v8.i1h.1577.

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Angles, S., and K. R. Jahanmohan. "Impact of mechanization on rice fallow pulses in cauvery delta zone of Tamil Nadu." INTERNATIONAL JOURNAL OF PLANT SCIENCES 18, no. 2 (2023): 110–15. http://dx.doi.org/10.15740/has/ijps/18.2/110-115.

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The rice fallow pulses crop is one of the major crop in Thanjavur District of Tamil Nadu state, in recent years the area under rice fallow pulses are dwindling due to use of heavy machinery like combine harvesters and tractor mounted balers. Hence, this study was conducted with an objective to assess the impact of mechanization on the rice fallow pulse and to quantify the economic loss due to non-cultivation of rice fallow pulses. Multistage Stratified Random Sampling method was employed for drawing the 100 numbers of samples farm households from Kumbakonam and Orathanadu blocks of Thanjavur district.Among the various consequences, season skipping was the main consequence of heavy machinery usage in rice farming on pulses cultivation in both the study blocks. The reduction in yield of fallow pulses to the tune of more than 50 per cent was felt as the major impact of mechanization in rice farming. Farmers in both the study blocks have cited that the reduction in yield was the major impact which was due to sub optimal plant population due to use of combine harvesters and tractor mounted balers. Non-availability of labour and associated higher cost for labourers was the prime for preference of heavy machineries like combine harvesters and balers in rice farming. It is suggested for development of paddy harvesters specifically for the regions where rice fallow pulses were practices, promotion of irrigated pulses in alternate season and to extend the price incentive which would incentivize the farmers to bring more area under pulses crops.

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Mani, G., K. Vanangamudi, and J. E. Vinila. "Screening the resistance of different seed sources of Azadirachta indica for acidity and alkalinity tolerance." Journal of Non-Timber Forest Products 11, no. 1 (2004): 25–29. http://dx.doi.org/10.54207/bsmps2000-2004-y5j6k6.

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To screen the resistance towards alkalinity and acidity, the seeds of Azadirachta indica collected from six seed sources, comprising six agro-climatic zones of Tamil Nadu were utilized. The seeds were sown between paper towel medium. The solutions of pH ranging from 1 to 12 were employed as treatments to dip the paper towels sown with seeds from different seed sources. Water served as control. The result of the experiment proved that Azadirachta indica has the tolerance to certain level of acidity (up to pH 4) and alkalinity (up to pH 8). The species is not capable of germinating in a pH lesser than 4 or more than 8. Among the seed sources, significant variation has been exhibited. The seeds collected from Southern zone seed source exhibited good potential to tolerate a pH ranging from 4 to 8. Seeds collected from Cauvery-delta zone seed source were found to be more susceptible to extremes of pH.

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Journal articles on the topic 'Cauvery Delta Zone'

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