Cotton

Crisis Management

Drought Conditions Waterlogged Conditions Floral and Boll Shedding Red Leaf in Field How to Increase Cotton Yields Cooling Systems and Equipment Uses of Potatoes in Indian Kitchens

Drought condition

  • 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.
  • 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)

    • 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.

    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

    • 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.

    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

      • 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.
      • 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
      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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    Andhra Pradesh