International Journal of Tea Science Volume 4 (2005)

Permanent URI for this collectionhttp://hdl.handle.net/2263/52008

International Journal of Tea Science Volume 4 (2005)

Contents

Chand, G., Sood, A., Palni, L.M.S.	Time division cycle in tea (Camellia sinensis) cultures
Choudhury, P., Dutta, B.K., Bhattacharjee, P.C.	Control of termites in tea (Camellia sinensis L(0) Kuntz) plantations of Barak Valley, Assam, (India)
Chowdhury, P., Mukerjee, S., Buragohain, D., Borah, K., Sadhu, M.K.	Effect of NPK fertilizer on yield of tea
Das, D., Bhattacharya, S.C., Maulik, S.R.	Dyeing of wool and silk with tea
George, U., Barpujari, N.	Influence of some soil chemical properties on yield of tea (Camellia sinensis) in the Dooars Region of North Bengal, India
Hazarika, L.K., Bhattacharrya, S., Kalita, S., Das, P.	BT as biocide and its role in management of tea pests
Mishra, A.K., Dutta, S., Kumar, B.S.D.	Biological control of brown rot disease and enhanced crop production in tea by a fluorescent pseudomonas strain
Tamang, M.B., Jain, N.K.	Vision and strategies of tea development in Hilly States
Trivedi, P., Pandey, A., Palni, L.M.S. Bag, N., Tamang, M.B.	Colonization of rhizosphere of tea by growth promoting bacteria
Yinfang, C., Zhong, X.H., Huokun, L. Mei, N.J., Xiaxiong, C.	Review on the investigation and protection measurements of spiders in tea gardens in China
Sharma, D.	WTO policies : how plant patents and trade policy threaten global food security

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Now showing 1 - 11 of 11

WTO policies : how plant patents and trade policy threaten global food security
(International Society of Tea Science (ISTS), 2005) Sharma, D.; Jain, N.K.
The fifth WTO Cancun Ministerial has failed. But just prior to it, the United States and the European Union had arrived at a new accord, which in letter and spirit lays out a detailed road map for what can be called as the second phase of the great trade robbery. And after the breakdown of the talks, the US-EU continue to make empty promises of growth and development without making any effort towards a true and meaningful reform in their own domestic policies.
Control of termites in tea (Camellia sinensis L(0) Kuntz) plantations of Barak Valley, Assam, (India)
(International Society of Tea Science (ISTS), 2005) Dutta, B.K.; Bhattacharjee, P.C.; Jain, N.K.
Termites cause serious damage to tea plantations in Barak Valley, Assam (India) especially during the dry season (i.e. September-March). Tea plantations in the southwest facing slopes are worst affected possibly due to poor soil moisture and shade. Termites also cause considerable damage to the vegetation growing in and around tea plantations. Both chemical and phytopesticides were effective for the control of termites. Among chemical pesticides, endosulphan, chloropyriphos and phorate were equitoxic. Crude neem oil and the extracts of Andrographis paniculata controlled the termite infestation and reduced the severity of termite damage.
Review on the investigation and protection measurements of spiders in tea gardens in China
(International Society of Tea Science (ISTS), 2005) Yinfang, C.; Zhong, X.H.; Huokun, L.; Mei, N.J.; Xiaxiong, C.; Jain, N.K.
Bio-control of tea pests by spiders in China has been reviewed by Chen Yinfeng et al. Spiders constitute 65% to 90% population of all the predacious natural enemies in tea gardens of China. Some 290 species belonging to 28 families predate on harmful insect pests and play a significant role in natural control of tea pests. The review profiles their occurrence, habits and hunting ability. Spiders prefer habitat with mild temperature and high humidity. Presence of interplant trees and some weeds help in building up their populations. However, spiders are sensitive to pesticide sprays, which reduce their populations by 20% to 90%. Both the hunting and net-forming spiders have an enormous potential as agents of natural control of tea pests. They are voracious consumers of insect pests. On an average, each spider eats up 20 - 120 insect larvae, nymphs and adults per day. Female spiders are better hunters of insect pests than males. Cases have been reported where a single female consumed more than 295 adult hoppers in one day. This review suggests agro-techniques to regulate pest-predator ratio and maximize benefit by spider-actuated control of harmful pests in tea gardens.
Dyeing of wool and silk with tea
(International Society of Tea Science (ISTS), 2005) Das, D.; Bhattacharya, Subhash Chandra; Maulik, S.R.; Jain, N.K.
Silk and wool fabrics were coloured employing aqueous tea extract in absence and presence of magnesium sulphate, aluminium sulphate and ferrous sulphate as the mordanting agents. Colour uptake for wool was found to be more than that for silk under all conditions studied. Colouring biochemical components of tea revealed highest affinity for both the protein fibres at pH 2 to 4 in presence and absence of such mordanting agents. Use of ferrous sulphate and aluminium sulphate produced significant improvement in colour uptake following a pre- or post mordanting methods. Coloured protein fibres in general produced a light-fastness rating of 5 on a scale of 1- 5 and a wash-fastness rating of 4 on a scale of 1-5. Ferrous sulphate and aluminium sulphate improved colour retention on washing and the fastness properties further. Coloured protein fibres became blackish, when ferrous sulphate was employed as mordanting agent.
Time division cycle in tea (Camellia sinensis) cultures
(International Society of Tea Science (ISTS), 2004) Chand, G.; Sood, A.; Palni, L.M.S.; Jain, N.K.
Propagations of tea (Camellia sinensis (L.) 0. Kuntze) through tissue culture is gaining momentum worldwide. We have studied the cell division cycle at regular intervals to optimise the medium and time period when maximum mitotic activity is seen. The study also includes effect of medium constituents on the genomic stability since such reports on cell division in 'In vitroJ'grown tissues in woody perennials are scanty. Perceptible differences in the mitotic indices were noticed in the cells from root tips, callus and somatic embryos growing under identical conditions. Best response was found in cells of the actively growing root tips. Further, it was seen that there was a very narrow time frame when the cells accounted for maximum divisional activity. Values for mitotic indices varied with the composition of media and growth regulator employed. This information could be helpful for better understanding of the somaclonal variations.
Vision and strategies of tea development in Hilly States
(International Society of Tea Science (ISTS), 2005) Tamang, M.B.; Jain, N.K.; Jain, N.K.
The International Society of Tea Science helped organize a National Seminar by the Uttaranchal Tea Development Board at Almora on May 29-30 after a field visit to the site of new tea plantations at Kausani, Uttaranchal, India. The meeting discussed the feasibility of introducing Clonal tea on the land that once supported a flourishing tea industry and then abandoned tea plantations for some reason which is still not clearly understood.
Effect of NPK fertilizer on yield of tea
(International Society of Tea Science (ISTS), 2005) Chowdhury, P.; Mukerjee, S.; Buragohain, D.; Borah, K.; Sadhu, M.K.; Jain, N.K.
An experiment was conducted to study the effect of various dosage of fertilizer on yield of mature tea and to determine the nutrient concentrations in tea soils and leaves under different dosage. The standard clone TV-1 was taken into consideration in three different agro-climatic zones of Assam. Total eight treatments were imposed in the trial along with normal fertilizer dose. Although T6 (50% excess of normal dose ie. 195 kg Nitrogen, 60 kg phosphate and 195 kg Potassium per hectare per year) give maximum yield, it is evident from plant nutrient analysis values that the above & higher dose of nutrient application tends to create micronutrient imbalance. Therefore it has been inferred that T5 (25 % excess of normal dose ie. 162.5 kg Nitrogen, 50 kg Phosphate and 162.5 kg Potash per Ha per year) has emerged as best treatment without adversely affecting the nutrient status of the soil. It was observed that soil N, P and K are positively correlated with leaf N, P and K respectively and also the yield of green leaf.
BT as biocide and its role in management of tea pests
(International Society of Tea Science (ISTS), 2005) Hazarika, L.K.; Bhattacharyya, Badal; Kalita, S.; Das, P.; Jain, N.K.
Bacillus thuringiensis (Berliner) has been under extensive use as a biopesticide for the last 55 years in many parts of the world, contributing 90% of the total commercial biopesticides formulations. It is being utilized as a natural regulating agent for different lepidopteran pests of tea. Recent studies revealed that commercial formulations of Bt were as effective as chemical pesticides. With the advent of genetic engineering, the insecticidalgene of Bf has been successfully isolated and cloned into many commercial crops. This review paper critically discusses the scope of using Bt and Bt transgenics for the management of tea pests.
Biological control of brown rot disease and enhanced crop production in tea by a fluorescent pseudomonas strain
(International Society of Tea Science (ISTS), 2004) Mishra, A.K.; Dutta, S.; Kumar, B.S.D.; Jain, N.K.
A fluorescent Pseudomonas strain isolated from soil under tea cultivation and designated as RRLJ 134 exhibited in vitro antibiosis against Fomes lamoensis, the causal organism of brown rot disease of tea on three different synthetic media. Dressing of two year old tea cuttings with this strain enhanced the shoot height, root length, number of buds, leaves and chlorophyll content of the newly emerged leaves in the nursery condition. Also, a statistically significant increase in fresh and dry weight of root, shoot, leaf and a bud was noted against control. The application of this strain also showed significant reduction in the number of infected tea cuttings in soil amended with F: lamoensis under nursery condition. The result indicates the possible use of this strain as a biocontrol agent of brown rot disease of tea besides enhancing the crop production.
Colonization of rhizosphere of tea by growth promoting bacteria
(International Society of Tea Science (ISTS), 2004) Trivedi, P.; Pandey, Anita; Palni, L.M.S.; Bag, N.; Tamang, M.B.; Jain, N.K.
Based on a detailed study conducted to isolate microbes from soil samples collected from various tea gardens located in the Indian Himalayan region, two bacteria namely Bacillus subtilis and Pseudomonas corrugata have been selected as promising inoculants for field application in tea gardens. Bioassays based on the inoculation of seed raised and tissue culture raised tea plants had earlier indicated the biocontrol and growth promotion properties of selected bacteria. With a view to introduce these bacterial isolates eventually in the tea gardens, suspension cultures were raised and applied (inoculated) in the rhizosphere region of both seedling and cutting raised (four clones) young tea plants under net-house conditions. Monthly enumeration of bacterial (including free living nitrogen fixers), fungal and actinomycetes populations, up to a period of one year, indicated excellent rhizosphere colonization by the inoculated bacteria. The presence of "introduced" bacteria in the rhizosphere was confirmed by the use of antibiotic markers. The inoculated tea plants have been transferred to new plantation sites, near Kausani in District Bageshwar, Uttaranchal for further monitoring of growth and overall performance.
Influence of some soil chemical properties on yield of tea (Camellia sinensis) in the Dooars Region of North Bengal, India
(International Society of Tea Science (ISTS), 2005) George, U.; Barpujari, N.; Jain, N.K.
The soils of Dooars (the sub-Himalayan regions of North Bengal) are high in organic C and available S compared to the prime tea-growing areas ofAssam. The effect of these two parameters as well as soil pH and available K, routinely tested in tea soils of Northeast lndia, on yield of tea was assessed. The results were compared with earlier observations made on the tea soils ofAssam. Effect of soil pH and available K status on yield of tea is similar to that of Assam. The survey showed that the productivity of tea soils was often lower where the organic C is greater than 2% and/or where the available S was greater than 30 ppm. The possible reason may be due to the interaction of soil pH, organic C and available S in the tea soils of Dooars and their interactions on yield of tea.

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