Drought condition
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- Basically cotton is a drought resistant crop
because of its very deep root system.
- Drought may occur at any time of the growth
period, but the timing and intensity of drought
play an important role in cotton production.
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- A moderate drought in the early season may some times
be beneficial.
- Drought at pre flowering stage has been some times
observed to increase subsequent rate of flowering and
yield.
- Drought during the early stages reduces the vegetative
growth and finally the yield.
- Drought at reproductive stage results in square and
boll drop because it decreases the rate of photosynthesis
and stimulates the ABA and Ethylene production in young
bolls.
Ameliorative Measures
- Sowing of crop on ridges.
- Cultivate drought resistant varieties.
- Maintain optimum plant stand
- Conserve soil moisture by soil mulching.
- Conservation of plant water by the use of anti transparents.
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Excess Water (water logged
conditions)
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- Both under irrigated and/or rainfed conditions
when cotton crop is grown in vertisols, the problem
of excess water leading to water logged conditions
are very common, in the beginning of the crop
season and during the crop growth period due to
south west monsoon rains.
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Associated Problems
- Continuous and/or intermittent rains may delay sowing
due to excess soil moisture conditions.
- If rains are received immediately after sowing germination
gets effected due to anaerobic conditions - optimum
plant stand could not be established.
- Heavy weed infestation is the problem due to moist
soil conditions and mechanical/physical control measures
could not be under taken
- Excessive water stagnation in the field cause wilting
of crop plants which is otherwise called as physiological
wilt due to anaerobic conditions of soil.
- Physiological wilt is caused due to retarding respiratory
activity by roots.
Management strategy
- Layout the field into ridges and furrows and sow seed
on ridges.
- Provide channels across the ridges and furrows at
intermittent intervals to drain out excess water.
- Weed control by chemicals by pre emergence application.
- Moderately excess moisture conditions can be made
good by application of urea as top dressing immediately
after stopage of rains.
- When plants wilt due to excess soil moisture and lack
of soil aeration. Spraying of urea 2% or Multi K 2%
or polyfeed 2% at 10 days intervals an foliage helps
the plants to require their turgidity.
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Floral & Boll Shedding in Cotton
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- Premature shedding of floral bud and young bolls
is very serious physiological problem hampering
cotton production.
- The cotton plant is able to produce only about
one third of its flowers into harvestable bolls
- A general shedding of about 60% in the form of
squares, 8 per cent in the form of flowers and 5%
in the form of bolls is common.
- Physiological shedding of buds and bolls is much
less than the damage caused by insect pests.
- The degree of shedding depends on environmental
as well as hereditary factors.
- Squares are more sensitive than bolls to physiological
injury due to its complex growth pattern.
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Causes for bud and boll shedding
- Imbalance between source (Photosynthetic surface) and
sink (flowers and bolls).
Differences in photosynthetic efficiency
- Poor drainage or flooding during or after flowering
under excessive moisture conditions, functional activities
of roots are sufficiently impaired.
- Lack of aeration also adversely effects fruiting activity.
- A decline in maximum relative humidity from 95 to 65%
together with a rise in maximum temperature from 87 to
95°F rapidly increases the rate of boll shedding.
Zinc and Boron deficiency
- Prolonged drought and moisture stress.
- Insufficient soil moisture during reproductive growth
in cotton promotes bolls shedding.
- Water stress during early flowering cause shedding of
squares before they are flowered while late stress at
flowering reduces the rate of flowering and boll retention.
- High temperature during flowering and boll development.
Around 38° or above causes boll shedding.
Cloudy weather
- Adequate sunlight is an important factor and an interruption
in high sunlight intensity accelerates boll shedding in
cotton. Excessive shedding of young bolls during rainy
weather is a common experience.
Closer spacing
- In a closely spaced crop of cotton reduction in light
intensity below the canopy causes boll shedding. This
is more pronounced in varieties with excessive leafiness
and bushy growth.
- Partial sterility of pollen or unsuccessive pollination.
- Excessive application of Nitrogen favours vegetative
growth and results in more shedding of buds and bolls.
- Insect or disease incidence
- Heavy boll load (Cut out)
- Availability of assimilates (source and sink relation)
- Hormonal imbalance
- Rate of production of auxins - provokes the formation
of a thin abscission layer across the peduncle of the
bud or boll.
- Mechanical injury.
Physiological reasons for boll shedding
- Abscisic acid (ABA) is the major factor for boll shedding
in cotton.
- Boll shed is more when abscisic acid content is about
0.002 mg (effective range).
- Early shed of bolls occur after about 5th day of anthesis
then (ABA) concentration reaches effective range.
- Other bolls shed after 6th - 8th or 10th day at the
latest.
- In retained bolls, the ABA concentration is much below
the effective range.
- Differences in shedding of young bolls among varieties
depends on the level of endogenous abscisins, auxins,
gibberellins and cytokinins produced with in the boll.
- Endogenous substances interact in the boll and form
abscission layer.
Boll shedding in relation to flowering
- Shedding of bolls was higher in a variety that produced
large number of flowers.
- Yielding capacity of a cotton variety therefore can
not be judged by its profuse flowering.
- Number of mature bolls retained at the end would be
the correct measure of productivity irrespective of the
number of boll shed.
Management of cotton after severe square
shed
- Ascorbic acid (0.1 mm & 0.6 mm) and Napthalin Acetic
acid (0.1 mm), increased kapas yield eventhough there
is no improvement in boll setting.
- Maximum response was obtained when 5% sucrose was mixed
with 0.6 mm AA or 0.1 mm NAA.
- The pattern of boll shedding was shifted to higher nodes
with these treatments.
- Responses of varieties to these growth regulators varied.
- Spraying of AA @ 40 ppm, and/or CCC @ 250 ppm and micronutrients
viz., Zinc, Boron and Magnesium @ 10 ppm each gave good
response.
- Growth regulators were more effective under irrigated
fertile conditions.
- Under rainfed and low fertility conditions better response
was observed with Napthalin acetic acid (NAA).
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Red leaf in Cotton
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- Reddening of leaves in cotton generally described
as red leaf disease, red blight and yellow-red
disease.
- The common symptoms are the rapid development
of deep pink to red colour in leaves which commences
when the crop is at about 50 to 60 days.
- This spreads rather rapid and is generally
associated with infection by jassids.
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- Barbadenses and Hirsutum varieties are mostly pre-disposed
to this physiological phenomenon.
- The loss is severe if it occurs at early stages
of growth.
Causes for Reddening
- Nitrogen deficiency.
- Water logging or water stress.
- Drop in temperature below 21°C.
Symptoms and Biochemical changes due to reddening
- The reddened leaves show low chlorophyll content
with high anthocyanin pigment.
- Total Nitrogen, Magnesium and Zinc are generally
low in leaves with high level of calcium.
- Low nitrogen, phosphorus, magnesium and Zinc and
copper and high amounts of potassium and calcium in
the soil.
- Magnesium deficiency is primarily associated with
reddening.
Precautions and correction of deficiency
- Optimum supply of nitrogen.
- Sowing dates may be strictly adhered to avoid low
night temperature of less than 21°.
- Water logging may be prevented, since this results
is non availability of Magnesium.
- Application of Mg SO4 at 20-25 kg/ha to the soil
or foliar spray with 5 per cent MG SO4 and 1% urea
as soon as the reddening symptoms appear in leaf reduces
this disorder.
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How to increase
cotton yields
- Avoid monocropping.
- Adopt crop rotation invariably.
- Practice inter cropping in cotton.
- Select a variety or hybrid recommended / suitable
to soil and climate of your region.
- Test the seed for its germination percentage well
in advance before sowing.
- Take up seed treatment as per recommendation as per
the situation.
- Ensure there should be sufficient moisture at sowing.
- Sow HYV or hybrids preferably on ridges.
- Deep sowing should be avoided (3 - 5 cm optimum depth).
- For short duration varieties reduce spacing in between
and within rows (75 x 75cm2 or 90 x 90cm2) and for long
duration varieties give wider spacing between and within
the rows (105 x 105cm2 or 120 x 120cm2)
- Fill the gaps within ten days after sowing (grow cotton
seedlings in the polythene bags on the day of sowing
- fill the gaps with these plants to avoid age difference).
- Inter cultivate 2-3 times with a blade harrow in between
rows within 30 - 40 days after sowing (Rainfed cotton)
helps in reduction of evaporation losses and better
infiltration of water into the soil (if there is rain)
since the soil is loose. In irrigated cotton after each
top dressing and irrigation, run the blade harrow between
the rows of cotton.
- Thin out excess seedlings at 20 days after seeding
- keeping one seedling per hill (Hybrids) and two seedlings
per hill (varieties).
- To avoid / reduce square and flower drop - spray NAA
twice @ 1ml / 4lit of water at 45 and 65 DAS full coverage
of squares and flowers.
- Fertilize crop at
- Nitrogen - 30, 60 and 90 days after sowing in equal
splits (irrigated cotton)
- Phosphorus - Last ploughing
- Potash - 30, 60 days after sowing in equal splits
- Use only recommended doses of fertilizers, pesticides
and other chemicals if any at right time in right method.
- Placement / pocketing of fertilizer at 7 - 10cm away
from plant at 7 - 10cm depth.
- If Nitrogen deficiency is seen in standing crop spray
2% urea twice.
- If Magnesium deficiency is observed spray 1% MgSo4
(10g of MgSo4 in one litre of water) at 45 and 75 days
after sowing.
- If Zinc deficiency is seen apply 50kg ZnSo4 in the
last ploughing. If soil application could not be taken
up spray 0.2% ZnSo4 (2g of ZnSo4 in one litre of water)
twice at an interval of 4 - 5 days.
- If boron deficiency is observed spray 0.1% (1g of
Boric acid in one litre of water) at 60 and 90 days
after sowing.
- Schedule the irrigation promptly.
- Avoid excess irrigation.
- Sufficient soil moisture should be there at the time
of top dressing of N fertilizer.
- Careful monitoring of crop for pest/disease incidence.
- Take appropriate plant protection measures.
- Save first flowering at any cost - otherwise-excess
vegetative growth leads to reduction in yield.
- Spray pesticides on bottom of the leaves for sucking
pests
- Spray pesticides on flower, fruits and vegetation
in case of borers.
- Use pyrethroids only under extra - ordinary conditions
only once or twice during crop period.
- Use of alternate methods (BT, PV, Chrysopa, Trichogramma
& Neem products) instead of insecticide use when
ETL level is reached.
- Use of Neem products and Endosulphan initially when
insecticide use is warranted. Both are relatively safer
to natural enemies.
- Top the plant to arrest excess growth after putting
15 - 16 sympodial branches for every plant.
- Quality of first two pickings is high - keep the produce
separately for higher price.
- Do not mix undeveloped lint, insect or disease damaged
lint or spoiled lint with quality lint.
- Remove cotton stubble's after last picking. Defoliants
like Dropp @ 150 - 200 g / ha in 600 lit of water applied
at boll bursting stage hastens the maturity of cotton
and vacation of fields 12 - 15 days earlier for double
cropping under irrigated conditions.
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Cooling Systems and Equipment
- Duncan (1955) designed an evaporative cooling system
using spray water as cooling agent.
- A pump recirculates water at a rate greatly in excess
of the evaporation.
The essential requirements for better operation
of this system are as under
- Uniform distribution of air across the spray chamber.
- Suitable air velocity of about 300-700 fpm in washer
chamber
- An adequate amount of spray water broken into fine droplets
- Good spray distribution across the air stream
- Sufficient length of travel through the spray and wetted
surfaces
- Elimination of free moisture from the outgoing air.
- Wilson (1971) designed a forced evaporative humidifier.
He concluded that the rate of evaporation of water is
limited by the following factors:
- Water surface area exposed to air
- Rate of air flow in the chamber
- Mixing motion of air with water
- Temperature of water in circulation.
- Fergin (1974) studied various combinations of heat recovery
and evaporative cooling.
- In a simple evaporative cooling system, Outside air
is cooled by water spray to the desired supply air conditions.
- The second part consists of spray nozzles or cooling
pads. Entering that side, air is cooled by water spray.
- The cooled air then absorbs heat from a second outside
air stream via heat recovery unit.
- This second air stream is then further cooled by a second
water spray and then introduced into the control chamber.
- Subramanium (1970) studied about of thermal insulation
for cold stores.
- He used different insulation materials of different
thickness for comparative performance.
- He recommended paddy husk for walls and rock wool or
thermocol for ceiling and other parts of the storage structure
for better performance.
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Uses of Potatoes in Indian Kitchens
- Potato is used in Indian kitchens in one way or the
other and no meal is considered perfect without potatoes.
- It is mixed in large number of dishes and hoped that
these dishes whether exclusively potatoes or not, will
form either a part of the basic diet or shall be used
for special occasions, etc.
Item
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Ingredients |
Remarks |
Potato-Cheese
crispies |
Medium
sized
cooked potato,
Butter, Mint,
Coriander
chutney,
Craft cheese |
Grate
boiled potatoes
Beast in the butter when cold.
Chopped craft cheese and a little mint coriander
chutney
Shape the mixture into small balls, toss them lightly
and fresh breadcrumb and deep-fry them in ghee oil
until golden brown. |
Potato
Cheese Splits |
Medium
Sized
PotatoesCottage
or Craft
CheeseTomato
sauce or Mango
relishButter |
Bake
the washed potatoes until they feel soft when pinched
or forked. Split each potato into halves, place
a cheese slice, little chutney and ½ teaspoonful
(2-3 g) butter or as per taste. |
Banana
Split |
Banana
per
personCrushed
potato
Wafers
(crisps)Whipped
cream to
decorate the
bananasApple
/ Apricot or
any Jam |
Peel
bananas. Brush with a thick coating of the jam.
Coat with potato crisps. Pipe cream on each banana
in a simple line. Serve immediately. |
Potato
Straws |
Large
PotatoesSaltIce
WaterOil or
Ghee for frying |
Peel
and cut potatoes into very thin long strips. Immerse
them in a solution of ice water and salt for about
½ hour. Drain and dry them on a piece of cloth.
Heat oil and deep-fry the potato straws until crisp
and golden brown. Serve them sprinkled in the salt
and pepper as per taste |
Potato
Crisp Praline |
Potato
WafersSugar |
Heat
sugar in a small thick pan, unless melted continue
to heat until goes golden brown on very low heat.
Crush the wafers with Belan and quickly stir into
the sugar and pour at once in a thin layer over
a greased baking sheet or Thali. Leave to set. Crush
it when dry. Store in airtight jar until required. |
Potato-Rice
Hamburger |
Boiled
PotatoSalt
Cooked
salted
RicePepper |
Combine
potato with salt & pepper
Form a potato partly covered with mashed cooked
rice to form flat balls
Role in fine bread crumbs and fry. |
Potato
Balls |
Boiled
potatoesFresh
bread slicesSalt
Pepper
Coriander,
Chilli,Cumin,
Anardana etc. |
Mesh
potatoes
Soften the bread (after removing their all 4 crusts)
in water and press them within palms to drain off
excess water
Mix this bread with potatoes and the herbal powder
Make into patties of heart, leaf or any other shape
Deep fry in extra hot medium. |
Potato
Soup |
Potatoes
Carrot
Piement
Fresh
BeansWater
Onion
Chopped
ButterCorn
flourSour
Cream Or
CurdChopped
Parsley Or
CorianderSalt
And Pepper |
Peel
and wash potato and other vegetables
Cut potatoes and carrot into small pieces
Boil in ½ liter water until soft
Strain and put them into a pan
Add other vegetables, 400 ml water and boil once
In another frying pan, Saute onions in butter until
brown
Add the flour and saute again
Mix cooked ingredients in a pan, Pepper to taste,
mix curd, sprinkle with garam Masala and chopped
parsley and serve hot. |
Potato
or Crunchy Omelet |
Egg
per
person Course
chopped potato
Wafers or
boiled
grated
potatoesPepper
& SaltGhee |
Beat
well the eggs
Mix with pepper and salt
Heat the oil in a 8-10" pan and cover the base with
thin layer of crushed wafers or grated potatoes
Pour over the egg mixture, stir very lightly cook
until golden brown and serve. |
Baked
Potatoes |
Large
potato
per person
ButterSauce,
Chutney,
Salt, Pepper |
Wash
and dry the potatoes
Wrap in aluminum foil to be baked with hot coal
or burnt cows dung or hot oven at 350 deg F.
Pierce the fork while cooking to let the steam out
Peel and serve with salt, butter, and sauce
Use small potatoes for quicker cooking. |
Potato
Salad |
Medium
sized
potatoesOnion
choppedGarlic
cloves
chopped
Green
chillies chopped
MayonnaiseOil
& vinegar
salad
dressingTo
lightly cover
the salad |
Peel
, slice and boil potatoes until just cooked
Do not overcook otherwise they will break
Drain and mix potatoes with remaining ingredients
except mayonnaise and chillies
Add mayonnaise just before serving
Garnish it with shaved carrot, coriander leaves
or cabbage or chopped tomato.
For oil and vinegar dressing: mix 2 tablespoonful
salad oil and 1 tablespoonful vinegar, 1 spoonful
salt + 2 spoonfuls freshly ground pepper and shake
well. |
Potato
Pan Cakes |
Potato
Egg
Onion
gratedSalt
Tomato
Sauce or
Mango
Chutney |
Wash,
peel and finely grate potatoes in salted water
Slieve grated potatoes
Mix grated potatoes with onion in a bowl
Add beaten eggs and mix well.
Make into thick cake and fry until brown on both
sides.
Serve hot with chutney |
Potato
charchari |
Medium
sized
potatoes,
Small
dry
red chillies
halved, Turmeric powder, Water,
Coriander
leaves
chopped,
Poppy
seeds
Salt
Chilli
powder
Lime juice |
Peel
and cut potatoes after washing potatoes.
Fry the poppy paste in same in the same oil after
frying potatoes
Add potatoes, salt, turmeric, chilli powder and
fry 1-2 minutes.
Add water, cover and simmer till potatoes are tender
and water absorbed
Add lime juice and serve hot. |
Crispy Tips to Instantly Add the Potato Flavour
- Replace French fries with the wafers. Crumble the
wafers on scrambled eggs or panion bhurji or salads
for better taste.
- Enhance flavour of thick soups with a topping of broken
potato crisps.
- Finally crushed potatoes are a better substitute for
bread crumbs for the pakoras / bondas, etc.
- Add crunchiness of potato by layering broken potato
wafers between butter and / or vegetables in the bread
sandwiches.
- Plain cakes taste and look better if a mixture of
chopped wafers and sugar is put on the top of plain
cake before baking.
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