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Layering

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Layering

  1. 1. Layering Prepared by Devendra shahu Class roll no. 17 B.Sc.Ag 8th sem.
  2. 2. Introduction• Roots are formed on a stem• root while still attached to the parent plant
  3. 3. Contd.• the stem or root which is rooted is called a layer• the layer is removed from the plant only after rooting has taken place
  4. 4. Contd.• Layering is the process of developing new plantlets in which root formation takes place on layered portion of stem before they are severed from mother plant.
  5. 5. Principles of Layering• Through notching or girdling,The downward tranlocation of carbohydrates, hormones and other organic substances is interrupted by the removal of the bark .• This carbohydrates, hormones and other organic substances are accumulated in the girdled site where dormant adventitious buds regenerates and give rise to root.
  6. 6. Simple Layering• a branch from the parent plant is bent to the ground• covered with soil at one point• terminal end remains exposed
  7. 7. Simple LayeringEg. Climbing rose, Rhododendron
  8. 8. Trench Layering• parent plant is bent to the ground and covered.• Shoots arise from buried buds and roots form under soil
  9. 9. Trench Layering• Examples:  Willows, viburnum, and dogwood
  10. 10. Serpentine Layering• Similar to trench layering but the branch is alternatively covered with soil.• and exposed over their entire length.
  11. 11. Serpentine LayeringEg. grapes, wisteria
  12. 12. Stool or Mound Layering• parent plant is cut back to the soil level• entire plant is mounded with soil• forms numerous shoots and roots
  13. 13. Stool or Mound Layering• Examples: apple rootstocks, quince, magnolia, etc.
  14. 14. Tip Layering• the tip of the stem or branches are bent down• burried in the soil to the depth of 5-7.5cm.
  15. 15. Tip Layering• Examples: blackberries, raspberries,etc.
  16. 16. Air Layering• Ancient Chinese practiced air layering• process eliminates burying part of the plant in the soil
  17. 17. Air Layering• instead, a part of the stem is girdled• cut all the way around• the cut is surrounded by moist sphagnum or peat moss
  18. 18. Air Layering• Moss is wrapped with plastic to hold in place• roots grow from the wound on the stem
  19. 19. Air Layering• Plants that propagate well this way:• Rubber Tree• Persian Lime• Magnolia
  20. 20. Air Layering• When rooting is complete• 4-6 weeks• cut layer BELOW roots and transplant• Parent portion will continue to grow and form new branches
  21. 21. Equipment UsedPruning Knife Secateur
  22. 22. Technique of Air Layering 1.Selecting a branch: Select a healthy, nonflowering branch Pencil size 5 years old and Above branch
  23. 23. Technique of Air Layering2. Make two incisions in the bark, one inch apart, around the diameter Of the branch and connect with another incision
  24. 24. Technique of Air Layering 3. Remove the bark between the incisions using the connecting incision as a Starting point
  25. 25. Technique of Air Layering 4. Applying Rooting hormone
  26. 26. Technique of Air Layering• Place damp, not wet, sphagnum moss around the wound
  27. 27. Technique of Air Layering• Compress and shape sphagnum moss to cover the wound - about one to two inches on either side of the wound.
  28. 28. Technique of Air Layering• Cover with plastic.
  29. 29. Advantages andDisadvantages• relatively simple• requires more time• requires a lot of work by hand• fewer plants can be started from each parent plant
  30. 30. Advantages andDisadvantages• usually very successful• some plants layer naturally - raspberry
  31. 31. Thank you

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