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TEA RESEARCH ASSOCIATION Tocklai Tea Research Institute (An ISO 9001:2008 Certified Organisation)

JORHAT-785 008, ASSAM, INDIA Ph.-91-376-2361674/2360974/2360475Fax:91-376-2360474, e-mail:advisorytocklai@tocklai.net,advisorytocklai@gmail.com

QUARTERLY ADVISORY BULLETIN Number : 01 January- March, 2018

Some important points to be emphasized: Post pruning cold weather operations are vital for maintenance of bush and

soil health. Any limitation, if exist in the bush and soil, should be removed by adoption of appropriate methods.

During knife cleaning operation for removal of unproductive banjhi shoots, dead, diseased and damaged branches, care should be taken not to damage productive branches.

Apply protective bituminous paint or Trichoderma(10%) paste on large cuts and Trichoderma solution (5%) on the pruned frame soon after pruning.

Application of alkaline mixture (washing soda 6kg + Quick lime 2kg in 100 l of water) should be done for improvement of bush hygiene. It also encourage bud break.

Heavy textured soil and waterlogged sections should be forked/hoed. Cleaning, deepening and re-grading of existing drains should be undertaken

from the outlet end where necessary. The excavated soil should be evenly spread over the field.

Breathers should be removed when at least 50% bud break has taken place. Closely monitor pest/disease incidence and control with recommended

pesticide to protect the newly emerged buds. If the flower buds are noticed in young tea, remove manually with care. Find

out the cause of flowering and correct the deficiencies. Uproot perennial weeds like Fern, Mikania, Polygonum and other woody

weeds manually from the affected section.

MAINTENANCE OF UP SECTIONS

Level off skiff should be undertaken where the table is uneven. Time it

with a low ambient temperature regime.

Hand leveling should be done when a leaf rise has been given in recent

past.

Do not skiff the bushes which are in water stress condition and turned brownish. If possible go for irrigation.

Spray 1-2% MOP at fortnightly interval till March (if there is no good rain). Add 1% MgSO4 also.

Issued by Advisory Department, TTRI, TRA, Tocklai

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YOUNG TEA MANAGEMENT

Frame formation prune (FFP) operation, after adequate rest, during end

January to early February. Thumb pruning/decentering young tea plants planted during October-

December of earlier year should be considered during late February to mid April at the height of about 20-25cm from the ground.

Mulch young tea plants with vegetative matters leaving a radius of about 10cm around the collar free.

Head back central leader branches, at about 30cm (on merit) from ground level following formative prune for frame development.

Too much opening of the centre of bushes should be avoided to obtain uniform distribution of branches.

Decentering/pruning of the infills, if left out earlier, should be completed. Tipping allowance of young tea following decentering/FFP1/FFP2, should be

at a height of 65-70cm from the ground.

POST-PRUNING OPERATIONS

Treat the cut marks of pruned teas with 5% Trichoderma suspension before it dries up. Best results are obtained if such treatment can be done immediately after pruning.

Knife cleaning operations should be confined to removal of unproductive thin twiggy banjhi shoots, dead/damaged wood only.

The knots in the level of prune should be removed.

Unnecessary use of knife in the process of KCO inducing fresh injury to the branches should be avoided.

Application of alkaline solution prepared by mixing of washing soda 6Kg and quick lime 2-3 kg in 100 litres of water helps in improvement of bush hygiene and also softens the bark for easier bud break kills pupa of different pests.

In case of termite/ poria infested bushes removal of damaged branches is an essential operation following pruning. Termites as is most active during cold weather. Removal of earth runs from pruned bushes and loosening of soil around the collar region of the bushes before application of pesticide can increase efficiency. Irrigation before chemical treatment facilitates better percolation of chemical. Encouraging results are obtained by treating the soil around the collar region with Metarihizziun anisopliae (cfu 4.7X105) with 10% suspension.

Flatten drain sides and fill up depressions including collar region of the bush to avoid localised waterlogging.

In case of heavy soil hoeing/forking and levelling is helpful for better aeration around the root zone. The operation should be completed by mid February.

Clean, deepen / re-grade the drain beds starting the work from discharge end.

Before digging of main drain LS profile survey work ought to be done. The deepening/re-grading of the same should be started from out let end which in some cases may need to be extended beyond the estate’s boundary.

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Remove lungs (breathers) when bud break started. In order to prevent multiplication of sucking pests treatment with recommended contact insecticide is essential.

Uproot ferns, Mikania, polygonum etc. during cold weather.

TIPPING AND PLUCKING

UNPRUNED TEAS

Drought affected bushes should be plucked liberally during first flush to add a fresh layer of foliage to cover up the exposed stubs.

Pockets/depressions on the plucking table. if exist, should be filled up by liberal plucking adding leaf as necessary in the initial few rounds.

In case of normal healthy bushes with initiation of growth in the new season, initial plucking rounds should be at shorter interval to remove the banjhis at softer stage.

PRUNED/SKIFFED TEAS

Tipping measure is decided depending on severity of cut. Following tipping measures are recommended as per the pruning and tipping type.

Type of prune/skiff Tipping height over last pruning/skiffing mark

Number of leaves retained in new lateral/primaries

Rejuvenation prune 30-35cm 5-6 leaves

Medium prune (MP) 30cm 5-6 leaves

Light prune (LP) 20-25cm 5 leaves

Deep skiff (DS) 8-10cm 2 leaves

Medium skiff (MS) 5 cm 1 leaf

Light skiff Same level Pluck to janam

Tipping should be done as soon as some shoots are ready attaining height. Only

mature 2+B should be tipped.

YOUNG TEA MANAGEMENT

Thumb pruning/decentering of young tea plants planted during October-December of earlier year should be considered during late February to mid

April at the height of about 20cm from the ground level.

In 01+year tea head back one or two strong central branches at 25-30 cm above ground to open up the centre.

Carry out first frame formation prune (FFP1) operation in 18-24 month old tea at 35-40cm above ground after adequate rest during end January to early February. Final frame forming prune (FFP2) should be done after 24 months from first FFP at 40-45cm above ground.

Mulch young tea plants with vegetative matters to a thickness of about 15cm leaving a radius of about 10cm around the collar free.

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Too much opening of centre of bushes should be avoided to obtain uniformity distributed branches in the frame. Cross branches should also be attempted to be separated using cut branch.

All cuts should be painted with Trichoderma (20%) or Copper pasting within 48hours of pruning.

Decentering/pruning of infills, if left out earlier should be completed.

Tipping of young tea plants following decentering/FFP1/FFP2 prune should be at a height of 65-70cm from the ground level.

Infilling of vacancies should be ensured with healthy, well grown plants preferably after debudding in the nursery.

NURSERY MANAGEMENT:

V.P.NURSERY

Take appropriate care of mother bushes from any pests and diseases.

Fill up the polythene sleeve with porous soil, free from eelworm and with desirable pH-4.5-5.0.

In the area with heavy soil, mix sand at right proportion with the soil for better success.

Cover the sleeves with easily decomposable mulching material and provide overhead shade.

Need based watering should be done with hand sprayer after propagating the cuttings.

SEED NURSERY

Percentage of germination is less if seeds are stored for a longer period.

Complete sowing of seeds by first week of January.

While sowing, keep eye of the seed downwards.

The sleeves with seed should be kept moist by watering judiciously.

SHADE NURSERY

Preparation of bed should be completed during January.

Adequate organic manure (25t/ha) and slaked lime@2t/ha should be applied in the beds before final preparation.

Depth of sowing : 0.5-1.0cm

Spacing from seed

to seed. : 20cm

Interline spacing : 30cm

Drain depth between

Two beds : 60cm

For better germination soak the seeds in warm water (800C) overnight and surface dry in shade before sowing.

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After seed sowing cover the sleeves or beds with a thin layer of any decomposable material and spray with recommended pesticide by hand sprayer.

Watering should be done at regular interval.

HAIL DAMAGE

Trichoderma biocide@5% or copper fungicide@1:400(HV) dilutions should be applied within 24 hours of hail damage.

The bushes of the affected sections should be rested till recovery and regrowth taking place.

The light prune (LP) and deep skiffed (DS) sections should be retipped at pre-determined level with care and attention adding leaf as necessary. The unpruned sections should also plucked carefully adding leaf judiciously on the plucking table as necessary.

Foliar application of Naphathelene acetic acid (NAA) and kinetin each @0.01% hasten wound healing. Urea@2% with Zinc sulphate @0.5% also helps in wound healing and quicker recovery. Priority of spraying should be in order of young tea – MP – LP – UP.

Close monitoring for pests, particularly thrips and red spider should be undertaken and immediate spraying with appropriate chemical as per TRA’s recommendation should be done as necessary.

Fertilizer should not be applied till new growth of two full leaves take place after hail damage. Foliar application of Urea and MOP@2% each at 3-4 weeks interval is beneficial. In the sections with damage nearing severe level,

Additional nutrients of NK mixture (1:1)@30kg N and K each per hectare can be applied.

DRAINAGE

Do not allow the excavated soil heaped along the drain bank to facilitate runoff and avoid localized waterlogging condition.

Main drain with inadequate capacity should be examined by doing profile survey and accordingly should be re-graded starting from the outlet point.

The field drains should have a spacing as indicated below:

Course textured soil (sandy/loamy sand) : 20-25m

Medium textured soil (Loamy/sandy loam): 12-15m

Fine textured soil (Heavy) : 09-12m

Remove localized waterlogging in pruned/deep skiffed areas by undertaking ground levelling/providing shallow relief drains from the centre of depression to nearest field drains.

PLANT PROTECTION

Looper Caterpillar

Destruction of the eggs mass on shade tree trunk manually or by physical means like heat treatment using flames.

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Mass light trapping of moths by using any UV light with a trapping device during moth emergence period. Few monitoring lights should be continued to see the future trend of pest and take follow up action.

As soon as 1st instar caterpillars are noticed apply Emamactin Benzoate 5%SG@80g/200l or Flubendiamide 20WG@40g/200l water in alternate round, which are found to be very effective to eliminate the brood.

After chemical treatment, survived late instar caterpillars should be collected by hand, if infestation is confined to limited areas like young tea, pruned and deep skiffed sections, nursery etc.

Red slug Caterpillar Light trap as suggested for looper caterpillars should be done to kill the

moths as far as possible. Once infestation is noticed, Quinalphos 25EC@1:400(HV) dilutions should

be sprayed at early stage covering lower surface of the maintenance foliage. Thrips/Greenfly Black plucking should be continued in infested sections. Detection at the early stage and treatment of the infested bushes with

systemic insecticide like Thiomethoxam 25%WG @1:4000(HV) / Thiacloprid 21.7%SC @1:1000(HV) / Clothionidin 50WDG @1:4500(HV) dilutions etc will be helpful.

Yellow sticky traps should be used. Scale Insects They are mostly active on stems inside the bushes infestation is not noticed

if not checked or pruned the bushes. Growth of black sooty mold is also an indicator of scale infestation. Clones like TV1, TA17and P126 etc. are more prone.

If active, spray Thiomethoxam 25%WG @1:4000(HV) / Thiacloprid 21.7%SC @1:1000(HV) Clothionidin 50WDG @1:4500(HV) to control scale insects covering the foliage and branches.

Red spider mite Shade plantations should be done,if it is not adequate. To protect the road side bushes from dust hedge can be developed by

planting Phlogacanthus thrysiflorus, Vitex negundo etc. along road side. Any other locality available thorny herbs can also be used.

To prevent spread of the pest, cattle trespass inside the sections should be stopped and workers should not be allowed to enter non infested tea areas from infested one.

The mite may multiply fast after few showers with increased temperature and humidity during April-May. In such cases apply acaricides like Propergite 57EC / Fenazaquine 10%EC @1:400(HV) dilution / Fenpyroximate 5EC @1:2000(HV) / Hexythiazox 5.45 EC @1:2500(HV) / Spiromecifen 22.9%EC @1:1000(HV) etc.

Spot spraying should be done at initial infestation to avoid blanket application.

In case of severe infestation damaging/defoliating the maintenance foliage, pluck liberally adding a layer of fresh foliage.

Tea mosquito bug The pest starts building up from end April-May after some showers with warm weather followed by its first peak in June-July. Sections nearly jungle area or heavily shaded patches are more vulnerable. In heavily shaded section lopping of side branches of shade should be done

up to 5-6m above ground.

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In tea bushes lower unproductive branches (matidals) should be removed. In case of dense sections the side laterals of tea bushes at table level along

the plucking gullies should be trimmed to create a gap of around 20-25cm for aeration.

The infested shoots should be plucked off before spraying of pesticide.In case of severe infestation at light skiff can be done.

Weed must be kept under control to avoid the alternate host of the pest. If pest is found active apply systemic insedticide like Thiomethoxam 25WG

@1:4000(HV), Thiacloprid 21.7%SC @1:1000(HV) / Clothianidin 50WDG @1:4500(HV) etc. Follow up round of insecticide should be applied within 15 days if fresh infestation is noticed.

During rainy period recommended synthetic pyrethroid should be applied in short rain free period. However, it should be avoided as far as possible.

Application of Botanicals The common weeds having pesticidal property like Clerodendrum viscosum (Dhapat tita), Polygonum hydropiper (Patharua biholongoni), Xanthium strumarium (Agara), Cassia tora and shrubs like Vitex negundo(Pasatia) leaves and seeds of trees like Pongamia pinnata etc should be applied in mixture at 10 % concentration (High volume). The fresh vegetative matters (Leaves, flowers and soft stems) should be crushed and soaked for 3-4 days followed by straining with muslin cloth, the extract from 10 kg of herbs should be mixed with 100 liter water (10 %) and sprayed. It can be applied as a routine spray, to reduce infestation of most of the common pests like red spider, Helopeltis, thrips and green fly to a great extent. After application of this botanicals, if any pest is found active then only above recommended pesticides should be used. Vitex negundo is a good hedging material as not eaten by goat and cattle. Hence, should be used as hedge propagating by stem cutting along the sectional boundaries. It will also provide raw material to spray in future. Red rust on stem and leaves The predisposing factors like inadequate drainage, poor shade status, incorrect

soil acidity, low soil potash etc. should be rectified for permanent cure of the disease.

Green crop like Tephrosia candida, T. vogelli, etc., which are prone to red rust, should not be kept for long time in young tea sections.

Hail affected bushes become prone to red rust hence monitoring should be done and control measures should be undertaken if infection is noticed.

From April to mid August spray the infected bushes with Copper oxychloride @1:400 (HV)/ combination product of Carbendazim 12 % + Mancozeb 63 % WP at 1:400 (HV) dilution for 4 rounds, first two rounds at fortnightly interval and subsequent rounds at monthly interval. Thorough drenching of the branches is

essential to destroy the spores. Foliar application of Urea and MOP @ 2 % each is found beneficial after control

of the disease. Spray the young shade trees both in the field as well as in the nursery. Black rot Shade regulation should be done in over shaded area. Improvement of aeration by lopping side branches and matidals of tea bushes. Drainage should be improved in poorly drained sections. Spray two blanket rounds of Copper oxychloride @1:400 (HV)/ Hexaconazole

5EC @ 1:1000 (HV) at fortnightly interval covering the entire canopy particularly the lower surface of maintenance foliage in April-May followed by spot application until the disease in under full control.

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Fusarium die back

Remove the infected primaries Apply Hexaconazol @1:1000(HV) at fortnightly intervals until disease disappears.

ZINC APPLICATION

Zinc (in the form of Zinc sulphate)

Zinc @ 12.5kg/ha/year in 4-6 spray per year

In case of 4 sprays/year, concentration would be 0.78%. that is dissolve 3.125 kg ZnSO4 in 400L of water per spray.

In case of 6 sprays/year, the concentration would be 0.52%. That is dissolve 2.08 kg ZnSO4 in 400L of water per spray.

CROP & WEATHER

Meteorological observations recorded at Tocklai Met Station

Particulars October November December

2017 2016 Normal 2017 2016 Normal 2017 2016 Normal

Rainfall (mm) 149.3 98.7 115.3 9.8 17.3 24.1 00 20.2 12.1

Rainy days 10 7 11 2 3 4 00 2 3

Max. Temp. (0C) 30.8 31.1 29.5 28.1 28.1 26.6 25.2 25.8 23.5

Min. Temp. (0C) 22.0 21.8 21.2 15.3 15.6 15.5 11.2 10.9 10.8

R.H. (%) At 06.13 hrs 91 94 96 94 94 96 95 95 96

R.H. (%) At 13.13 hrs 70 68 71 60 60 63 58 55 60

Wind speed (Km/day) – – 24.9 – – 17.9 – – 16.1

Sun shine (hours) 5.6 6.2 5.8 7.3 6.9 6.4 6.0 6.7 6.1

Evaporation (mm) – – 66.8 – – 48.3 – – 36.4

Rainfall during the period of October to December was found variation this year, in the month of October the south bank received higher rainfall compared to the last year. However in November and December rainfall was less as compared to previous year. Rainfall received during this period was less as compared the long term average. The total number of rainy days was at par with that of long term average during the period of October and November, however, the total number of rainy days was zero in the month of December. The maximum and minimum temperatures during the period was comparable with that of last year and the sunshine hours during this period, from October to December was at par than that of long term average.

Till the end of November 2017, the South Bank region was behind in crop by 3.38%(to-date). By the end of October 2017 the region was behind in crop by 3.76%(to-date). Infestation of red spider mites and sporadic infestation of looper and greenfly were noticed in patches in a few tea estates of the region (average of data received).

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Forthcoming Activities at Tocklai

5- Months General Training Course. 1st February – 30th June

Digital Tea Garden Mapping

Digital Tea Garden is a initiative undertaken by Climate and GIS Lab, TTRI, TRA

to help the tea industry to get their tea garden maps transferred to a GIS

environment along all the data pertaining to the planting material, pruning

programme, plant population, age of bushes, yield of various clones,

infrastructure etc. of the tea sections analysed by the garden over the years. It

can also provide census information of labour lines along with location of

houses.

The digital mapping will help for planning purpose at the garden level since each

and every information about the required attribute can be visualized as a

separate layer digitally at the desktop as shown in figure below.

Fig1: Flow chart showing the conversion of garden map from paper to digital format extracting detailed

information as a separate layer

Please visit Tocklai websites www.tocklai.net for details.

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e-Books available for sale at Tocklai Library

1. Tea Field Management (Priced at Rs. 700 for members and Rs. 1400 for others)

2. The Tea Manufacturing Manual (Priced at Rs. 500 for members and Rs. 1000 for others)

3. Planters’ Handbook (Priced at Rs. 200 for members and Rs. 400 for others)

4. The Tea Tasting Manual (Priced at Rs. 500 for members and Rs. 1000 for others)

Best wishes for a happy and prosperous new year 2018

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List of CIB/TRA/PPC approved Agro-chemicals for use in Tea as on 30th

December, 2017

Name of Chemicals Trade Name

Name of

manufacturer Dose MRL (ppm)

Pre Harvest

Interval

(Days). As

per PPC

Ver. 9 ACARICIDES HV LV India EU Japan

Cyflumetofen 20 SC – – 1:500 1:250 – – 15 –

Dicofol 18.5 EC – – 1:400 1:200 5 20 3 16

Ethion 50 EC – – 1:400 1:200 5 3 0.3 10

Fenazaquin 10 EC – – 1:400 1:200 3 10 10 12

Fenpyroximate 5 EC/SC Mitigate

Isagro (Asia)

Agrochemicals Pvt.

Ltd.

1:1500 1:750

0.2

BT*

2.0

GT*

0.05 40 –

Pyromite Excel Crop Care Ltd. -do- -do- -do- -do- -do- -do-

Hexythiazox 5.45 EC Endurer Coromandel

International 1:2500 1:1250 1 4 15 12

Propergite 57 EC Mastamite Chemtura Chemicals India Pvt. Ltd.

1:400 1:200 10 0.05 5 20

Sulphur 80 WP – – 1:200 1:100 – – – 10

Sulphur 40 WP – – 1:200 1:100 – – – 10

Sulphur 52 SC - - - - - -

Spiromesifen 240 SC (22.9 w/v)

Oberon Bayer Crop Science Ltd.

1:1000 1:500 – 50 30 14

Etoxazole 10 SC Etoxazole

Sumitomo Chemical

India

Pvt. Ltd.

1:1600 1:800 0.01 15 15 –

Flufenzine 20 SC - - - - - 0.1 -

INSECTICIDES

Azadirachtin 1% EC - - - - - 0.01 -

Azadirachtin 5% EC Ecotin P.J. Margo 1:1500 – – 0.01 – –

Bifenthrin 8% SC – – 1:1600 1:800 0.05 30 30 5

Clothianidin 50 WDG Dantotsu Sumitomo Chemical India Ltd.

1:4500 1:

2250 0.2 0.7 50 14 – 21

Deltamethrin 2.8 EC Decis Bayer Crop Science Ltd.

1:2000 1:1000 2 5 10 10

Deltamethrin 11 EC - - - - - 5 10

Phosalone 35 EC – – 1:400 1:200 – 0.05 15 –

Quinalphos 25 EC – – 1:400 1:200 0.01 0.05 0.1 20

Quinalphos 20 AF – – 1:400 1:200 0.01 0.05 0.1 –

Thiacloprid 21.7 % SC Alanto Bayer Crop Science Ltd. 1:1000 1:500 5 10 30 7 – 14

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Thiamethoxam 25 WG – – 1:4000 1:2000 – 20 20 10

Emamectin Benzoate 5% SG

Missile Crystal Crop Science Ltd. 1: 2500 – – 0.02 0.5 7

Fenpropathrin 30 EC – – 1:1600 1:800 – 2 25 8

Flubendiamide 20 WG Takumi Rallis India Ltd. 1:5000 – – 0.02 50 30 – 40

Thiamethoxam 12.6% +

L- Cyhalothrin 9.5% Alika – 1:2666 1:1333 –

20 20 –

1 15

BIO-PESTICIDES

Beauveria bassiana 2.5

WP

(Cfu count 2X10 gm)

- - - - - - - -

HERBICIDES

Glyphosate 41% SL

Globus Nagarjuna Agri chem.

Ltd. 2-3 L/ha – 1 2 1 –

Round -

Up Monsanto India Ltd. -do- – -do- -do- -do-

–

Glycel 41

% Excel Crop Care Ltd. -do- -do- -do- -do- -do- –

Run out G.S.P. Crop Science -do- -do- -do- -do- -do- –

Glyphosate

(Ammonimum Salt)

71% SG

Excel Mera Excel Crop Care Ltd 1.5 kg/ha

for

broad leaf,

2.0 kg/ha

for mixed

population

– 1 2 1 – Safal

Tropical Agrosystem

(India) Pvt. Ltd.

Glufosinate Ammonium salt 13.5 SL

Basta Bayer Crop Science Ltd

1kg in 200

l water for

broad leaf

and 3kg in

200 l water

for

monocot

– 0.01 0.1 0.3 –

Glyphosate (Ammonimum Salt) 5% SL

1 2 1

Oxyfluorfen 23.5 EC Oxygold – 0.25kg

a.i./ha – 0.2 0.05 – –

Paraquat Dichloride 24%

SL/

WSC

Herbucsone Ankar Industries

500 ml – 1

L/ha in 200

lit of water

– 0.05 0.05 0.3 7

Oxyflurofen 2.5%

+Isopropyl amine salt of

Glyphosate 41%w/w SC

- - - - 0.2 -

2 1

13

Carfentrazone ethyl

0.43% + Glyphosate

30.82 EW

Glyfinity FMC India Pvt. Ltd.

3000ml in

500 lit

water/ha

– 0.02 0.02 0.1

– – 2 2 1

FUNGICIDES

Copper Oxychloride 50

WP – – 1:400 1:200

150 as

Cu 40 – 7 – 14

Carbendazim 12 % + Mancozeb 63% WP

– – 1:400 1:200 0.53 - - –

Hexaconazole 4% +

Zineb 68% WP - - - - - 0.05 -

Hexaconazole 5 EC – – 1:1000 1:500

0.02

BT* 0.05 - 12

Propiconazole 25 EC Tilt Syngenta India Ltd. 1:1000 1:500 0.1 0.05 0.1 14

Spray adjuvant (Sticker) recommended by TRA

Magic Shakti – Nivshakti Bioenergy

Pvt. Ltd.

20 ml in 200

L spray fluid – – – –

–

Nutrastick – Gassin Pierre Pvt.

Ltd.

20-50 ml in

200 L spray

fluid

– – – –

–

Tip Top – Krishi Rasayan

100 ml in

200 L spray

fluid

– – – –

–

APSA 80 – Amway India

Enterprise (P) Ltd.

100 ml in

200 L spray

fluid

– – – –

–

Dhanuvit – Dhanuka Agritech

Ltd.

120 ml in

200 L spray

fluid

– – – –

–

Active - 80 – Modicare Ltd.

100 ml in

200 L spray

fluid

– – – –

–

* BT = Black Tea * GT = Green Tea

Issued by Advisory Department, Tocklai Tea Research Institute, TRA, Jorhat, Assam