• The technique for vegetative propagation of tea by internodal cuttings.
  • Released 30 TV (Tocklai Vegetative) clones, 14 biclonal seed stocks and 151 region specific garden series clones.
  • Invention of following tea machineries:
    • MacTear Rotorvane
    • Borbora Continuous Leaf Conditioner
    • Continuous Tray Drier
    • Continuous Fermenting Machine
    • Borua Continuous Roller
    • Tea Breaker-cum-Stalk Separator
    • Green Leaf Storage Device
    • Continuous Withering Machine
    • Electronic Monitoring and Control System for Withering
  • Introduction of extended pruning cycle in lieu of annual prune for higher productivity and better distribution of crop.
  • Optimisation of plant population.
  • New techniques of bringing up young tea reducing the gestation period from planting to full bearing.
  • Land planning, drainage and balance manuring for higher productivity. Soil Amendment techniques.
  • Establishment of the necessity for a light even canopy of shade for tea plantations in the plains of N.E. India.
  • Introduction of safer pesticides for effective pest and weed control with emphasis on Integrated pest management.
  • Introduction of bioagents – Trichoderma and Bacillus for control of certain tea diseases and their formulation for commercial application.
  • Generation of data on pesticide residues in tea from multi-locational supervised field trials.

Tocklai’s Achievements in nutshell [decadewise]:

TRA Major achievements up to 1950 :

Introduction of annual prune
Improved pest control measures
Clonal propagation of tea from single nodal cuttings
Importance of legume as shade
Release of TV1, TV2 and TV3

TRA Major achievements up to 1950-59:

Release of TV4, TV5, TV6, TV7, TV8 and TV9.
Introduction of herbicides
Standardisation of tipping level at 5 leaves

TRA Major achievements up to 1960-69 :

Balanced NPK manuring
Introduction of longer pruning cycle
Leguminous shade tree
Planting pattern and plant density
Recommentation of herbicides

TRA Major achievements up to 1970-79 :

Introduction of micronutrient
Potash application basis
Biclonal seeds and their release
Drainage improvement
Young tea management
Better pest control methods

TRA Major achievements up to 1980-89 :

Plant growth regulators for crop productivity
Introduction of tissue culture in tea
Introduction of polyploidy clones
Irrigation and drainage
Improved pest control methods through IPM

TRA Major achievements up to 1990-99 :

Biopesticides, Trichoderma, Package for Helopeltis control
Drip irrigation
Tissue culture technique
New biclonal seeds and clones
Establishment of pesticide residue testing laboratory
Establishment of laboratory for heavy metal testing
Conservation of tea germplasm.


Production Division :

Standardization of Nutrient Management
Application of machinery in field practices
Biodegradable jute textiles for soil conservation
Establishment of the limits of chemical residues and heavy metals

Plant Improvement Division :

Development and release of high yielding diploid and triploid clones and biclonal seed stocks for Assam, Dooars and Darjeeling.
Identification of tissue cultured somaclones with high yield as well as quality.
Identification of Physiological parameters influencing drought resistance for development of superior planting material.
Development of tissue culture techniques for regeneration of shade tree plantlets from Albizzia odoratissima and A. chinensis.
Determination of endogenous hormones quantifid and effect of exogenous application on yield.
DNA fingerprinting carried out using RAPD Techniques in TV clones. These are being registered with National Bureau of Plant Genetics, New Delhi to protect their indentity. The fingerprinting work has been extended to other molecular techniques such as ISSR and AFLP. Genetic transformation studies were carried out where Ri plasmid of Agrobacterium rhizogenes was successfully transformed in tea shoots.

Plant Protection Division :
Entomology Department

Testing of new molecules for bio-efficacy against major pests.
Development of package of practices for Helopeltis and termite control
Evaluation of a number of phytochemicals, insect growth regulators and animal product and recommendations for IPM of major pests.
Generation of data on residues of seven pesticides in made tea from extensive supervised field trials.

Mycology and Microbiology Department :

Establishment of bio-efficacy of Trichoderma and recommendations for use against root and stem diseases of tea – this effectively brought down the rehabilitation period after uprooting to one year.
Establishment of the effectiveness of Bacillus subtilis and Beauveria bassiana for controlling leaf diseases and sucking pests of tea.
Development of bio-fertilizer formulation containing VAM and nitrogen fixer and made available to the member gardens for field evaluation.

Quality Division :
Tea Processing and Manufacture Advisory Department :

Introduction of split orthodox and modified CTC process with very encouraging results during monsoon months to improve tea quality.
Commercialisation of Electronic Monitoring and Control system for withering leading to energy savings and consistency in withering, cost effective withering through time and money saving.

Biochemistry Department :

Standardisation of biochemical constituents during processing with special reference to catechins and flavour.
Development of tea byproducts.

Service Division : Library, Planning & Information Technology :

Three projects on automation and database creation on hand.
Patents and Doctoral Theses database creation
Institutional repository of Doctoral theses in tea
Creation of CD versions of TRA publications
Scanning , digitization and creation of DVDs of Tocklai Library holdings
Proposed forming of Consortium of Plantation Crops Research Libraries for electronic resource sharing.