IMPROVED PACKAGE OF PRACTICES FOR CLONAL EUCALYPTUS
PLANTATIONS
I. HANDLING OF CLONAL
PLANTING STOCK
- Minimum age of the clonal
planting stock should not be less than 3 months from the date of setting
of cuttings. In addition, it should be ensured that the plants should
be hardened for at least 2 months from the date of shifting of rooted
cuttings from the mist chambers to the hardening chambers.
- After final grading and
counting of plants kept ready for deliveries, clonal planting stock should
be treated with 0.1% Lindane. The treatment should be given by dipping
the trays, including 5 cms. lower part of the stems of saplings, in the
emulsion of anti-termite chemical one or two days prior to issue of the
saplings. Labourers engaged for such chemical treatment must use rubber
gloves.
- 0.2% Bavistin or Captan
spray should be carried out on all clonal saplings just before delivery.
- Clonal plants should be
issued only after getting confirmation that the planting site has been
prepared thoroughly and the irrigation channels & planting pits are ready
for transplanting.
- Light irrigation of the
plants should be arranged on arrival of the clonal planting stock at the
planting sites. Temporary storage under partial shade is recommended, if
required. Arrange light irrigation twice a day till transplanting is
completed. Stock received at planting sites in compact multi cavity root
trainers should be retained in same trays on stands and irrigated twice a
day. Saline or alkaline water should not be used for irrigation.
- The vermiculite should
neither be too dry nor too wet at the time of removal of saplings from the
individual tubes of root trainer trays. A light irrigation during the
previous evening and gentle tapping of the tube will facilitate easy
removal of the plant from the tube with roots and the vermiculite in a
compact mass.
II. SITE SELECTION AND
PREPARATION
- It is extremely useful and
desirable to study soil profiles, pH, electric conductivity and fertility
status of soils before deciding to raise clonal plantations. Shallow rocky
soils or saline and alkaline soils have serious limitations for optimum
tree growth and high productivity. Many clones are not tolerant to saline
/ alkaline soils.
- Areas with shallow soils
less than 1M in depth or those with strong calcareous or lateritic pans
must be avoided. Likewise, areas with high alkalinity or salinity must
not be planted. Generally the pH should be less than 8.5 and electric
conductivity less than 2 milliohms / cm. Plants will suffer from
chlorosis on saline, alkaline or calcareous soils.
- Highly eroded sites or
lands subjected to heavy water logging must also be avoided. Planting
sites must be extremely well prepared by deep ploughing in either
direction followed by harrowing.
- Site specific clones
adaptable to different kinds of problematic soils can be planted trials on
similar sites. Suitable clones for moderately alkaline soils have already
been identified.
- The recommended spacing
for clonal plantations is 3x2 M for production of poles and pulpwood. .
However, for timber production, initial spacing should be 4 x 2 M. 50 %
trees will be thinned out at 4 to 5 years age and sold as poles. Balance
50 % can be retained at 4 x 4 M spacing until the requisite girth is
reached at 8 to 10 years rotation. In case of slope or undulating terrain,
the 3M or 4 M wide rows should be along the contours. This will
facilitate ploughing in between the 3M or 4 M wide rows along the contours
to conserve moisture and prevent soil erosion
- In case of level areas,
the 3 M or 4 M wide spacing should be in the east and west direction and
2M spacing in the north to south direction. This will ensure better
exposure wider inter spaces to sunlight. Ploughing in between the
lines in such cases will be in the north-south direction.
- However, in the coastal
districts subject to winds, the 3 M or 4 M wide spacing should be parallel
to the prevalent wind direction. This will ensure exposure of minimum
number of trees to the onslaught of direct strong winds. Clones
susceptible to wind breaks should not be planted in the coastal areas.
- Planting of Eucalyptus
clones in single row avenues around farm boundaries, field bunds, farm
roads and irrigation channels can be highly paying proposition for the
farmers, provided such plantations can be effectively protected against
damage by fire and cattle. We recommend such single line avenue
plantations wherever farmers can ensure proper protection. The spacing in
single line avenues can be 2 M apart for production of poles and 3 M apart
for production of timber.
- We recommend that each
farmer should plant minimum 3 or preferably more genetically improved,
high yielding and fast growing clones in separate blocks of each year's
planting area to safeguard against possible future risks like epidemic
diseases and pests. Intimate mixtures of clones are not recommended
because of large differences in initial growth rates and likely logistics/
management problems.
- A proper lay out design of
the field showing details of specific clones planted should be maintained.
This will facilitate monitoring and evaluation of comparative performance
& superiority of various clones on different sites.
III. PLANTING OPERATIONS AND
MAINTENANCE
-
Planting
pits must not be less than 30x30x30 cms. if prepared with spade. If the
pits for planting are dug with hand augurs, please dig up to 60 cms. depth
Keep the fertile soil from upper 30cms depth separately. Mix equal
quantity of very well decomposed farm yard manure with this top soil.
Refill lower 30 cms. Part of the pit with this mixture. Treat the balance
mixture, which will be used for refilling remaining 30 cms. part of the
pit after transplanting, with Lindane or Chloropyriphos @ 2 ml. thoroughly
mixed in 1 litre of water. There should be no weeds in the soil around
the planting pit
-
Refill the
lower 5 cms. of planting pits made with spade with treated soil. Hold the
clonal sapling in an upright position in the centre of the planting pit in
such a way that lowest roots or the mass of vermiculite is 2 cms. above
the level of soil in the planting pit. Holding the sapling in this
position, the treated soil should be refilled into the pit and gently
compacted. After compaction, about 5 to 7.5 cms of the pit should remain
unfilled for irrigation and holding rainwater.
-
In case of
black cotton soils, aforesaid procedure should be modified. Irrigation
water is added to the planting pit after refilling the pit upto 3 cms.
Level. No compaction should be carried out after completing the
transplanting operations. Only 3 cms. upper part of the pit should be
left unfilled to retain irrigation/rain water.
-
In case of
inadequacy of natural rains, Irrigation or pot watering at 3 to 7 days
interval depending on the need , soil and climatic conditions , will be
required till establishment of the transplanted clonal saplings
-
Any
chemical fertilizer applied close to the roots or stem of the young
saplings shall be positively injurious and harmful. Therefore, avoid
application of chemical fertilizers at the time of transplanting.
-
As most of
the soils are deficient in phosphorous and nitrogen, 50 kgs. Di -Ammonium
Phosphate (DAP) per acre can be applied as basal dressing to the intercrop
Likewise, if soils are known to be poor in potassium, 50 kgs Potash per
acre should also be applied as basal dressing to the intercrop. However,
it is advisable to decide the dose of various nutrients based on soil
tests.
-
After the
establishment of plants, first dose of nitrogenous fertilizer can be given
as top dressing after weeding, @ 25 gms; Urea per plant. However, the
urea granules should be applied in the form of a ring, minimum 25 to 30
cms. away from the stem. This should be followed by irrigation or the
fertilizer should be applied during the course of a mild rain. Any
chemical fertilizer placed close to the stem may dehydrate and kill the
plant.
-
During
subsequent years of growth also the requisite quantities of fertilizers
should be applied through broad-cast in the 3M wide rows followed by
irrigation. Where irrigation facilities are not available, such
fertilizers should be applied when adequate moisture is available or when
it is raining lightly. Ploughing in between the 3M to 4 M wide lines
should be carried out thereafter as soon as the soil is in proper moisture
condition.
-
Farmers
should be encouraged to apply farmyard manure to the entire field or raise
green manure crops for ploughing back into the fields. In any case of
manuring, the FYM or chemical fertilizer should never be placed in contact
with the roots or the stem. There should be no FYM or fertilizer within
a radius of 20 cms. from the stem of the young saplings. Application of
FYM and 25 kg/ha zinc sulphate will be helpful to minimize incidence of
zinc deficiency and chlorosis.
-
Young
plants are very sensitive to competition from weeds. At least three
weedings, in 50 cms. radius around the plants will be required every year
during the first 3 years. Care should be taken not to damage the saplings
during weeding operations.
-
Ploughing
in between the 3 M or 4 M wide rows of plants will help improve soil
aeration, moisture conservation and control the weeds. During first year,
plough the wide strips after harvest of intercrops and arrange second
ploughing at the end of monsoon rains. During subsequent years, one
ploughing after the first monsoon showers and sowing of green manure crops
like sun hemp is recommended. Green manure crop should be incorporated
into the soil by ploughing just before flowering.
-
Use only
tractors for ploughing in between the 3Mor 4 M wide rows. Do not plough
in cross direction unless the minimum spacing in either direction is more
than 3 M. Avoid injuries to the stems and roots of trees during ploughing
operations. 20-30 cms. space on either side of the plant rows should not
be ploughed but maintained free of weeds.
IV.
PROTECTION OF PLANTATIONS
-
White ants
or termites often cause wide spread damage to young saplings. Symptoms of
damage by termites are sudden wilting of healthy saplings and drying of
the leaves leading to death of the plant. If such plants are pulled out,
one can see girdling of the collar or roots by the termites. If any such
symptoms are noticed despite prophylactic treatment carried out as per
recommendation at S.No.17, additional treatment of the soil around all the
healthy saplings should be carried out immediately. 2 ml. of
Chloropyriphos or Lindane should be applied per plant dissolved in 2
litres water. Clean cultivation practices should be followed and
irrigation should be provided wherever possible.
-
The farmers
may please appreciate that total protection of plants against damage by
cattle and fire is absolutely necessary. No grazing should be permitted.
-
Likewise,
prevention of damage to the plants during the ploughing operations should
also be ensured. Normal ploughing should be only in one direction in the
3 M or 4 M wide strips.
-
No crop
residues should be burnt in or near the plantation areas as the young
Eucalyptus trees are very sensitive to fires. Even scorching hot winds,
generated by the fires in adjoining fields, can damage the plants.
Therefore, farmers must take adequate precautions.
-
If the
saplings are transplanted in 30 cms. deep pits, normally there will be no
lodging. In case of any incidence of lodging of young saplings, minimum
necessary earthing up to support the plants should be carried out. No
stakes should be used.
-
All
Eucalyptus clones are self-pruning. No pruning of the branches should be
carried out. If any plant is severely damaged because of physical
injuries or broken by the wind, the same should be coppiced back 5 cms
above ground level. If the wind damage is at a fairly high level in
plants more than 1 year old, there is no need for coppicing such plants,
as new leaders will emerge from the pollard shoots. Only forked or V
shaped double leaders should be prevented in young plants by careful early
pruning of co-leader.
V. BEST TIME FOR
TRANSPLANTING
-
Beginning
of the monsoon rains is the best time for transplanting. Early
transplanting ensures full benefit of the entire monsoon rains for optimum
establishment and growth of the saplings.
-
If assured
irrigation facilities are available, transplanting can be carried out any
time during the year. However no transplanting is advised during frost
prone months of December / January as frost may damage some clones.
Likewise, avoid transplanting during extremely hot summer period between
May to June, as there is possibility of high mortality rate because of
desiccation.
VI. TRANSPLANTING OF
SEEDLINGS RAISED IN POLYBAGS
-
Irrigate
the plants in polybags twice a day till completion of transplanting
operations. Irrigate plants in polybags lightly a few hours before
transplanting. Take the plants in polybags to planting pits carefully
-
.Initial
spacing should be 3 x 2 M for production of poles. Transplant at 4 x 2 M
for production of timber. One thinning to remove 50% trees for sale should
be carried out at 4 to 5 years age and remaining plants retained at 4 x 4
M spacing till harvest at 8 to 10 years age.
-
Treat the
planting pits, which must be not less than 30 cms in depth, and soil to be
refilled with 2ml Chloropyriphos or Lindane mixed in 1 litre of water.
This is absolutely necessary to prevent attack of white ants or termites,
which can otherwise cause heavy mortality of seedlings during
establishment in field.
-
Place the
polythene bag on ground. Cut the polythene bag with a sharp blade
vertically at two opposite points. Open the polybag like two leaves of a
book. Remove the plant along with entire ball of earth/ potting mixture
without disturbing the root system and transplant gently in pits treated
with anti termite chemicals.
-
Refill
treated soil and compact gently without damaging the potting mixture and
roots. Leave 2 to 3 cms pit unfilled at the top in case of heavy soils and
5 to 7.5 cms in case of well-drained sandy loam soils for retention of
irrigation/ rain water.
-
Irrigate
twice a week for one to two weeks and thereafter on need based basis.
Avoid heavy irrigation on clayey soil. Transplant early during the monsoon
rains in case of un-irrigated plantations. Adopt moisture conservation
measures. Maintain the plants free of weeds. Ensure protection against
fire, grazing and damage by cattle.
-
Follow
other package of practices as recommended for clonal plants. Repeat
chemical treatment to control termites or white ants if required as per
requirements depending upon the incidence of termites.
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