introduction: in layering method of plant propagation, roots are produced on an aerial plant parts...
TRANSCRIPT
Introduction:
• In Layering method of plant propagation, roots are produced on an
aerial plant parts like stem/branches. Rooted layer is then detached
and planted as an independent plant.
• Layering method has a high success rate and produces large number
of plants. It as an important method of propagation in fruit crops.
Air Layering in Guava
Methods of Layering:
• A growing branch of fruit trees is given a
tongue shaped upward cut and bent to the
ground.
• Cut portion of the branch is buried in soil,
leaving the terminal branch exposed in air.
• Rooting takes place at the wounded part of
branch after which the layer is separated from
mother plant using sharp knife. e.g. Guava.
Simple or Tongue Layering:
Simple Layering
Tongue Layering
Compound / Serpentine Layering
• Compound layering is similar to simple layering
except that the branch is alternately buried in
soil / growing media and exposed along its
length.
• Stem / Branch to be operated for compound
layering must be longer and flexible to be
layered at different locations.
• Creepers, Climbers and Vines like Grapes,
Clematis, Wisteria, etc. can be propagated by
Serpentine method of layering.
Compound Layering
Compound Layering
• Plant stems are cut back at the ground level during the dormant
season and allow them to sprout new shoots.
• Circular ring of bark is removed from the tender shoots and the
wound is treated with plant growth regulator like Indol Butyric Acid
( IBA).
• Wound on shoot is buried in mound of soil. Injured part of shoot
develops roots and are separated from mother plant. e.g. Apple
Mound / Stool Layering
• Air layering is method of root formation on aerial
plant parts / shoots.
• Circular bark on branch is removed and rooting
medium like sphagnum moss is tied on branch.
• Roots initiate on the upper side of the wound
where Sphagnum moss supply moisture till root
initiation. e.g. Pomegranate
Air or Gooty Layering:
Air Layering
Air Layering
• Selected branch of plant is bent in a shallow
trench in horizontal position and shoots are
covered in soil for rooting.
• Rooted layers are separated from mother
plants and planted in a nursery.
• Trench layering is successful in woody fruit
crop species like Apple, Pear, Cherry etc.
Trench Layering
Trench Layering
Trench Layering
Tip Layering:
• In tip layering, rooting takes place near the tip
of current season growth. Shoot tips are
buried 2 to 5 cm deep in soil.
• These shoot tips grow upward to produce a
bend in the stem and roots initiate at the
curve of stem.
• Rooted tips are separated from the mother
plant and maintain in nursery or planted in
field. e.g. Blackberries, Raspberries.
Tip Layering
Selection of Shoot for Layering