| CARDAMOM-CROP
IMPROVEMENTS
The sailent
findings of research carried out on cardamom at the Regional Research
Station, Mudigere during the last three decades ( 1958 to 1988) are summarised
as under:
A.
Crop
Improvement
1. A Malabar prostrate clonal selection with an average dry capsule
yield of 250 to 300 kg per hectare has been released as "Mudigere-1' for
cultivation in the state during 1984.
2. Clonal selections CL - 683 , CL-679 , and CL-726 found superior in
yield than Mudigere -1 are under farm table.
3. P-6 having recorded higher dry matter accumulation and leaf area
index consistently over years, is found promising as a drought tolerant
clone.
4. Studies on variability have indicated that nearly 44% of clumps in
a population are normally poor yielders (less than 100 g of green capsules
clump) contributing to only 14.5 % of the total yield. Hence, systematic
replantanting of such plants with high yielding clones would help in increasing
the productivity of the plantation.
5. Similarly, as nearly 5% of the plants only in a population are found
to be very high yielders ( 500 to 900 g of green capsules / clump contributing
to 15% of the total yield), selection of such clones for mass - multiplication
and planting is desirable.
6. Among the several clones studied , clone Mudigere -1 exhibited relatively
low genetic variability hence seeding progenies of this clone could still
be used when clonal material is not available for large scale planting.
B. Crop Management
1. Viability of cardamom seeds being very low, sowing soon after the
harvest (during September - October) was found to be the best.
2.Scarification of seeds fro ten minutes with 25 percent nitric
acid
followed by Bavistin + Captan seed treatment ( 4 g / kg of seed ) was
found to increase germination and protect seeding from " seed rot" and
' damping off' diseases.
3.In the event of sowing seeds very late in the season (Nov-Dec) covering
the nursery beds with polythene sheets soon after sowing was found to
enhance seed germination by nearly 30 percent.
4.of the various mulches tried for covering seed beds, paddy
straw was found to be the best and most economical.
5.Studies to find out the optimum age of seeding for planting
have indicated the superiority of two - year old seedlings in getting
early and high yields.
6. In view of the change in rainfall pattern in recent years, planting
of cardamom even early in the season ( June- July) was found suitable
and desirable in the season for early establishment and growth ) as against
earlier recommendation of plating only after middle of August.
7. A spacing of 1.8 m x 1.8 m ( 3025 plants / ha) was found
to be optimum for cardamom.
8. Studies with high density planting with a spacing of 1.8 x 0.9 m
(6170 plants / ha ) indicated early and high yields in the initial 3 to
4 years. However, removal of alternate plants after 5 to 6 years was found
inevitable for facilitating easy cultural operations.
9. Deficiency symptoms of N , P, K, Ca and Mg have been
developed and were found to be expressed when their contents in leaf were
0.84, 0.32, 2.16, 0.65 and 0.11 percent respectively.
10.Nutrient uptake studies in cardamom have indicated the
uptake of N, P, K , Ca and Mg to be in the ration of 6:12:3:0:8 respectively.
11.For rapid multiplication of suckers, application of 32.5
g of N, 25 g of P2 O5 and 50 g of K2O plant was found desirable.
12.. A fertilizer dose of 37.5:37.5:75 kg of NPK/ha for one year old crop
during September and 75:75:150 kg of NPK/ha from second year onwards in
two - split doses( during May and September) were found to be optimum.
13.Soils of the region being acidic in nature , application
of time was found to be beneficial .
11.Comprehensive Studies on shade in relation to cardamom productivity
have revealed that one third of the sunlight in the form of filtered light
was found to be optimum for growth and production of cardamom.
12.The combined effect of irrigation at 75% available soil
moisture and higher light intensity ( 65 to 70%) resulted in substantial
increase in yield.
13.Among the Several mulches tried, in the main field , leaf mulch was
found to be the best for growth and conserving soil moisture.
14. Application of Ethrel at 250 ppm under higher light intensity (
15 k.lux) gave highest number (50) of suckers as against 25 suckers in
control ( without growth regulator) with normal light intensity ( 5
k.lux).
15. Spraying 25 ppm 2,4 - D twice at monthly intervals soon after fruit
set ( June- July ) was found to minimize fruit drop in cardamom
C.Crop
Protection
1. Thrashing the clumps off old peels, leaves and suckers during May-June,
spraying with Nuvacron ( June - July ) 35 % E.C., 1.25 ml/litre up to
1.5. m plant height followed with another spray with zolone 25% E.C.,
2 ml/ litre 30 to 40 days later and removal of borer affected suckers leaving
2" from the ground, were found effective in suppressing both thrips and borers
- the major pests of cardamom.
2. Studies have indicated that an increase in yield up
to nine per cent could be obtained by keeping two to three bee boxes/
ha of cardamom.
3.Root grubs ( Basilepta sp. ) infestation in nursery could be affectively
checked by incorporating 3% G Furadan @ 6 to 8 kg / acre.
4. Damage by rodents and birds could be considerably minimized by adopting
trapping, clean culture, timely harvests and by baiting with Bromodiolone
(0.005%) or Rodafarin Cake.
5.Dithane M- 45 ( 0.25%) + Ridomil (0.1 % ) were found to be the most
effective fungicides for controlling damping off and leaf spot diseases
in cardamom nursery
6 . Clump rot disease could be effectively checked by drenching the affected
and neighboring clumps with 1% Bordeaux mixture once before the onset
of monsoon( June) and again after the end of monsoon( August).
7. Katte disease spread was found to be effectively checked by removing
affected clumps, old and decayed suckers and plant parts by regular surveys
and by avoiding planting of clones from affected gardens.
8. Studies have indicated that aphids could acquire and transmit virus
from the infected leaves only when moisture level was up 45.
9. To avoid further spread of the disease, eradication of
katte affected plants have to be done before thrashing
operation( May).
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