REGENERATION

REGENERATION

Natural Regeneration
  • Very poor due to destruction of seeds by ants
  • Young seedlings smothered by leaf collar
  • Leaves are toxic and contain germination inhibitor
Artificial Regeneration
Seed collection and storage:
  • Seeds should be collected from 10year old trees. Although fertile seed is available from young tree
  • In a year two collection 1st - February-March and 2nd – October-November
  • Capsules should be dries in shade for one day
  • Gently shaken to clean the shells
  • Dry and stored in tins at cool dry places
  • 3,67,400 seeds weigh one Kg
Nursery techniques:
  • Seed should be sown in raised nursery bed in the month of October-November or February-March
  • Soil should be sterilized with Aldrex or BHC against termites
  • Seed should be sown 20gm/m2 of bed in lines 10cm apart and 2.5mm deep
  • Germination takes place within 5-15 days of sowing
  • 60-75 seedlings are obtained from one gram of seeds
  • Seedlings are pricked out when they attain a height of 4-8cm
  • Pricking of seedling should be done in to polythene bag
  • Polythene bags initially should be placed in shade for few days and then shifted in the open in sunken beds
  • The seedlings are hand watered for some time and later the beds may be irrigated.
Planting out:
  • The area to be planted is clear felled ploughing and properly soil working should be done
  • In Terai areas of UP for the first year only cash crops are raised and plantings is done in the 2nd year
  • Pit size should be 45cm3 or 30cm3
  • For saline and alkaline soils large pit of 60cm3 with soil replacement with good soil are dug out at wider spacing
  • Planting is done in July in areas subject to South-West Monsoon
  • October-November in areas of North-East Monsoon
  • Container/bag should be removed at the time of planting
  • Watering and fertilizer application should be done in poor soils
  • Casualties are beaten up immediately after planting in the first year
  • In arid areas 3-4 watering in the first year produce good stock
Spacing:
  • Spacing depends upon the objective of plantation
  • Spacing varies: 1.8m × 1.8m – 3m × 3m
  • For firewood/fuelwood : 1m × 1m or 1.5m × 1.5m
  • For pulpwood/poles: 2m × 2m or 3m × 2m
  • For saw log: 3m × 3m
  • For Windbreaks and shelterbelts: 1.5m × 1.5m or 2m × 1m
Vegetative propagation:
  • Clonal propagation has been attempted by means of Grafting, budding, air layering and soft wood cutting
  • Propagules should be treated by IBA 10000ppm
  • The selected plus tree are cut at about 12cm height from the ground level
  • The coppice shoot are harvested between 45 days and 55 days after the tree has been cut
  • The cut shoot are placed in a bucket of water transplanted to the nursery
  • The length of cuttings vary from 10-15cm
  • The base of the cuttings should be treated with 200ppm solution of Benlate Fungicide for 15-30minutes
  • The base up to 2cm is treated with 6000ppm IBA diluted with talc powder
  • The cuttings are planted in polythene tubes
  • The growing media is vermiculite
  • Cutting develop good root system within 5-6 weeks
Tending operations:
  • Like weeding, fertilization thinning etc. Should be done time to time
Economic importance
(i) Pulp and fuel
(ii) Pole for general purposes
(iii) Leaves for oil
Last modified: Tuesday, 22 May 2012, 8:40 AM