Darjeeling Tea Research and Development Center

Bhubaneshwar, India

Darjeeling Tea Research and Development Center

Bhubaneshwar, India
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Bisen J.S.,Darjeeling Tea Research and Development Center | Chauhan R.K.,Darjeeling Tea Research and Development Center | Singh A.K.,Darjeeling Tea Research and Development Center | Singh M.,Darjeeling Tea Research and Development Center | And 2 more authors.
Ecology, Environment and Conservation | Year: 2017

Vermicomposting is a natural process of quick recycling of organic material into nutrient rich compost using earthworms under aerobic condition. It is an eco-friendly nontoxic product and requires low energy input during processing. In the present investigation an attempt has been made to develop vermicomposting technology suitable for Darjeeling conditions in which various organic wastes were evaluated to find out the best organic raw material for quality vermicompost production, insulating material for increasing vermibed temperature during winter for faster process of multiplication and growth of earthworms. Results showed that among the various organic raw materials Guatemala was found superior in respect to nitrogen (3.50%) and phosphorus (0.60%) whereas maximum potash content (3.00%) was recorded in water hyacinth. However, at maturity maximum nitrogen (2.60%) was found in Guatemala followed by tea waste whereas highest phosphorus (0.90%) and potash (1.41 %) content was recorded in kitchen waste followed by Guatemala, water hyacinth, tea waste, paddy straw, weed biomass, and saw dust. Total bacteria count was maximum in saw dust followed by kitchen waste, tea waste, weed biomass, saw dust, paddy straw and water hyacinth. Among insulating material, paddy straw + polythene used as insulating material could raise temperature up to 4-5 °C in the bed than ambient temperature. Multiplication rate of four earthworm species were studied and highest multiplication was recorded for Eisenia foetida followed by Perionyx excavates, Udrilus euginea and local species. © EM International.


Moitra S.,Allergy and Asthma Research Center | Thapa P.,Darjeeling Tea Research and Development Center | Das P.,Allergy and Asthma Research Center | Das J.,Allergy and Asthma Research Center | And 4 more authors.
International Journal of Occupational and Environmental Medicine | Year: 2016

Background: Indian tea industry workers are exposed to various exposures at their workplace. Objective: To investigate the respiratory health of Indian tea industry workers. Methods: We administered a respiratory questionnaire to and measured lung function in workers of 34 tea gardens and 46 tea factories. We used correlation matrices to test the association between their respiratory symptoms and lung functions. Results: The garden workers complained of shortness of breath 3 times higher than the factory workers. However, nasal allergy was more predominant among the factory workers compared to garden workers (69.6% vs 41.2%, p=0.02). The factory workers had higher total (median 107.3% vs 92.9%, p=0.05, as measured by R at 5 Hz) and peripheral airway resistance (143.8% vs 61.1%, p=0.005, as measured by R at 5–20 Hz) than the garden workers. Respiratory symptoms were inversely associated with airway obstruction as measured by the ratio between forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC) and positively correlated with increased overall airway reactance among the workers. Conclusion: Respiratory symptoms and increased allergen susceptibility of Indian tea industry workers due to occupational exposures warrant routine systematic surveillance of their workplace air quality and health monitoring. © 2016, NIOC Health Organization. All rights reserved.


Chandra S.,University of Calcutta | Chandra S.,Directorate of Research | Chakraborty N.,University of Calcutta | Chakraborty A.,Darjeeling Tea Research and Development Center | And 3 more authors.
Archives of Phytopathology and Plant Protection | Year: 2014

Tea, the second most consumed beverage after water in the world, is produced from the processed tender leaves of tea plants (Camellia sinensis). Production of tea is hindered by various biotic and abiotic stresses. Among the biotic factors, blister blight disease caused by an obligate fungal pathogen, Exobasidium vexans Massee, is a serious problem to the tea industry. The present study was to evaluate the efficacy of elicitor calcium chloride (CaCl2) in inducing resistance in tea plants against blister blight disease. During the pick time of blister incidence at Darjeeling tea garden, the application of CaCl2 at a concentration of 1% resulted in disease inhibition around 71% over the control set. Treatment also resulted in the induction of defence enzymes like peroxidase, polyphenol oxidase, phenylalanine ammonia lyase, β-1,3-glucanase and higher phenol accumulation. Furthermore, the increase in defence molecules also correlated with increase in nitric oxide (NO) generation, a potent defence molecule in plant defence. The result suggests that CaCl2 can used as a potential elicitor in the integrated disease management in organic tea cultivation. © 2014 © 2014 Taylor & Francis.


Biswas P.,Darjeeling Tea Research and Development Center | Kumar N.,Darjeeling Tea Research and Development Center | Singh M.,Darjeeling Tea Research and Development Center | Majumder A.B.,Tea Board of India | And 3 more authors.
Proceedings of the International Conference on Sensing Technology, ICST | Year: 2012

The term 'quality' is used as a description of all the characters of tea by which it is judged on its market value. So quality means the summation of the desirable attributes comprising aroma/flavour, strength, colour, briskness and character of infused leaf. In this investigation, as a new approach to determine tea quality, biochemical investigation, such as determination of total phenols, theaflavins, thearubigins and caffeine, E-Nose response, E- Vision taken images and tasters scores were acquired for large number of orthodox black tea samples obtained from different Darjeeling tea gardens and results are correlated to find the functional relationship. The relationship is used to calibrate the E-Nose sensor response for this kind of produce. A relationship between the types of the liquor colours with taster's scores of the samples has also been observed and also explained with the help of the biochemical test results. © 2012 IEEE.


Dasgupta N.,Indian Statistical Institute | Biswas P.,Darjeeling Tea Research and Development Center | Kumar R.,Darjeeling Tea Research and Development Center | Kumar N.,Darjeeling Tea Research and Development Center | And 2 more authors.
Physiology and Molecular Biology of Plants | Year: 2013

Ten Darjeeling tea clones (BT15/263, RR17/144, B777, T253, B157, Sundaram, HV39, AV2, K1/1 and TTV1) were collected from the experimental garden of Darjeeling Tea Research and Development Centre, Kurseong. Total phenol, flavonoids and two antioxidating enzymes (peroxidase and superoxide dismutase) were estimated. The total phenol ranged between 241 and 28 GAE mg g-1 of leaf dry weight. The highest amount obtained in four clones, B15/263 (241.47), RR17/144 (221.2), B777 (154.54) and B157 (140.23 mg g-1). Flavonoids were estimated as Catechin equivalent (CE) and ranged between 56.88 and 20.81 CE mg g-1 leaf dry weight. Higher amounts occurred in BT15/263 (56.88 mg g-1), B777 (56.69) and RR17/144 (48.63). Antioxidant activities were measured following DPPH and ABTS free radicle scavenging procedures and the results were well according to total polyphenol content among the clones (in total phenols, ranges of correlation in DPPH assay were r2 = 0.990-0.989, p ≤ 0.05; in flavonoids r2 = 0.954, p ≤ 0.01-0.987, p ≤ 0.05). Similarly, ABTS percent scavenging results were quiet significant. The IC50 values were determined for both DPPH and ABTS assay. PAGE expressions of isoforms in two antioxidative enzymes and quantification of them also varied much among the investigated clones. The incidence of total phenols, flavonoids, PRX and SOD and ROS scavenging assay in in-situ condition, might be used as biochemical markers towards the superior adaptability against abiotic stress. In the present work, four clones (B15/263, B777, RR17/144 and B157) would be designated as comparatively better suited to the predicted abiotic stress. © 2013 Prof. H.S. Srivastava Foundation for Science and Society.


Bisen J.S.,Darjeeling Tea Research and Development Center | Singh A.K.,Darjeeling Tea Research and Development Center
Indian Journal of Horticulture | Year: 2012

Organic cultivation of tea has already started in India. Darjeeling tea has an edge in international and domestic markets. A study was undertaken to compare the traditional and organic cultivation in Darjeeling region in 21 gardens. Yield reduction was 10 to 21.2% during conversion period. In medium and low yielding gardens there was a reduction of upto 29%. However, the quality parameters were quite better with higher price realization.

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