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Das B.,Tocklai Experimental Station | Roy S.K.,North Bengal Agricultural University
Research Journal of Pharmaceutical, Biological and Chemical Sciences | Year: 2014

The study was conducted to identify the important characters under boron deficient and supplemented conditions that may be used as selection criteria in a wheat breeding program. Experiment was carried out in a randomized complete block in a split-plot arrangement with twenty one wheat genotypes. Data were recorded on different parameters like, Days to 50% flowering, Plant height (cm), Tillers/plant, Spike length (cm), Spikelets/spike, Grains/spike, Chaffy grains (%), 1000 Grain weight (g), Harvest Index and Yield/plant (g). The PCV were always higher than GCV for all the ten characters studied under both boron deficient and boron supplemented condition. This indicated environmental influence on the expression of characters under study. In the present investigation, high genetic advance associated with high heritability and with comparable genotypic coefficient of variation were evident for the characters viz., chaffy grain %, harvest index under both conditions and number of seeds per spike and grain yield per plant under boron deficient condition. Therefore, these traits deserve more attention in further breeding programs for evolving better wheat for stress environments.

Hatibaruah D.,Jorhat Engineering College | Baruah D.C.,Tezpur University | Sanyal S.,Tocklai Experimental Station
Journal of Food Processing and Preservation | Year: 2013

Microwave drying characteristics of Assam crush, tear, curl (CTC) tea were determined at five different microwave power of 180, 360, 540, 720 and 900W respectively. The effect of power level on moisture content and drying rate (d.b.) of 50g CTC tea sample were investigated. The time required to reduce the moisture content to any given level in microwave drying was dependent on the power level. Four mathematical models (Henderson and Pabis, Lewis, Page and logarithmic) were used for fitting experimental data. The estimated empirical parameters together with the corresponding sum of square error from nonlinear regression analysis for all the models were tested. The Page model was found to have the better suitability for describing drying characteristics of Assam CTC tea. © 2012 Wiley Periodicals, Inc.

Karak T.,Tocklai Experimental Station | Karak T.,Upper Assam Advisory Center | Bhattacharyya P.,Indian Statistical Institute | Paul R.K.,Indian Agricultural Research Institute
Clean - Soil, Air, Water | Year: 2014

The dynamic parameters of the transformation of fresh cow dung (FCD), municipal solid waste (MSW), pond sediment (PST), tea pruning litter (TPL), tea waste (TWE), and water hyacinth (WHH) into a manure using a co-composting process were investigated. Among the six different modes of compost, it was observed that the best quality of compost can be produced where the substrate was FCD/MSW/TPL/PST/TWE/WHH 1:1.5:1.5:2.5:2.5:1 with respect to Indian compost standard. Hierarchical agglomerative cluster analysis (HCA) for physical and chemical variables during composting yielded a dendrogram and formed two clusters, one of which includes temperature, amount of cadmium, chromium, copper, lead, MSW, nickel, phosphorus, and zinc and the other includes cation exchange capacity, FCD, germination index of chickpea, germination index of green gram, mercury, nitrogen, organic carbon (OC), pH, TPL, potassium, PST, TWE, and WHH. Principal component analysis (PCA) was applied to all the data sets, which resulted in nine, four, four, three, and two latent factors of the total variance in compost quality. Varifactors of PCA implied that the parameters responsible for metals and P were MSW and temperature variation, N was mainly related to PST and TWE whereas OC was influenced by TPL and FCD. Therefore, on application of HCA and PCA, a meaningful classification of the above-mentioned parameters has been obtained. Thus, these results should be effective measures for future in using tea garden waste materials for the preparation of valued eco-friendly compost. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Hatibaruah D.,Jorhat Engineering College | Baruah D.C.,Tezpur University | Sanyal S.,Tocklai Experimental Station
Journal of Food Processing and Preservation | Year: 2011

Moisture sorption isotherms of Assam CTC manufactured from tea cultivar T3E3 were determined at 30, 40 and 50C using the static gravimetric method over a range of relative humidity from 0.1 to 0.9. The equilibrium moisture content of the tea sample decreased with increase in temperature at constant relative humidity. Seven mathematical models (Brunauer-Emmett-Teller, Peleg, Oswin, Henderson, Halsey, modified Chung-Pfost and Guggenheim-Anderson-de Boer [GAB]) were used for fitting experimental data. The Oswin and GAB models were found to have better suitability for describing the sorption curves. The monolayer moisture content values for the sorption at different temperatures were calculated by using the GAB model. The net isosteric heat of sorption was estimated from equilibrium sorption data, using the Clausius-Clapeyron equation. The enthalpy-entropy compensation theory was applied to sorption isotherms, and plots of Δhd versus ΔSd provided the isokinetic temperatures, indicating an enthalpy-controlled sorption process. Practical Applications: Assam CTC tea is an important processed food commodity involving substantial commercial activities at national as well as international levels. Appropriate processing and perfect storage of this commercially important commodity are two critical issues to be addressed to fetch higher prices at competitive tea markets. The cultivars available today for tea production are T3E3, S3A1, S3A3, TV1 to TV31, etc. T3E3 is a very popular yield clone for CTC tea production in Assam. There is a considerable variation in the rate of loss of moisture among these cultivars. The knowledge of equilibrium moisture content (EMC) vis-à-vis water activity (Aw), which is the central theme of the present investigation, is one of the important factors to regulate overall manufacturing processes. Moreover, results of the present investigation will also be helpful to ascertain appropriate storage conditions for processed tea. Because biologic activities in tea during storage are highly sensitive to its moisture content due to the presence of several complex enzymes, such as polyphenol oxidase, peroxidase, etc., inactivation of these enzymes requires the knowledge of safe moisture content. Thus, the results of the present investigation would have important practical applications, particularly in tea processing and marketing sectors. © 2011 Wiley Periodicals, Inc.

Das S.K.,Jagannath Barooah College | Sabhapondit S.,Tocklai Experimental Station | Ahmed G.,Gauhati University | Das S.,Tocklai Experimental Station
Biochemical Genetics | Year: 2013

To verify the quality of triploid varieties of Camellia tea species at the secondary metabolite level, we tested caffeine and catechin profiles of 97 F1 segregating progenies in two breeding populations with a common tetraploid parent and diploid parents of two geographic and varietal origins. Catechin and caffeine levels of the triploid progenies were quantified and compared against their diploid parent. Some of the progenies showed better performance than their diploid parent. Most of the progenies of the diploid C. sinensis × tetraploid cross showed heterosis for caffeine and EGCG. Progenies of the C. assamica subsp. lasiocalyx × tetraploid cross showed heterosis for +C, EC, EGC, and TC. The genomic contributions of the diploid parent seem to be the main factor in the variation between the two populations. Our studies showed quantitative enhancement of some of the quality-related parameters in tea, providing a platform to refocus on this classical breeding approach for developing quality cultivars in tea. © 2013 Springer Science+Business Media New York.

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