ECONOMIC BOTANY PART 2-TEA, COFFEE, COTTON, JUTE

 

🍵  Tea

Family-theaceae

Botanical name- Camelia sinensis/Thea sinensis

Economically important part- Leaves

Tea

Tea is a medium-height tree. Grown at high altitude(=2000ft) in well-drained soil. The rainfall required is more than 100cm. Once grown, the plant can produce tea for 30 yrs.

• Global Beverage: Tea (Camellia sinensis) is the second-most-consumed drink worldwide, after water.

• Cultivation: Grown in over 32 countries, covering more than 2.5 million hectares. India, China, Kenya, and Sri Lanka are leading producers.

• Exports & Trade: Tea is a major cash crop and export commodity. India contributes ~13% of global tea exports, with Assam and Darjeeling teas being world-famous.

🍵 Processing of Tea

Tea processing transforms fresh leaves into dried leaves suitable for brewing. The method varies depending on the type of tea (green, black, oolong, white, etc.), but the general steps are:

1. Plucking

   • Tender leaves and buds are hand-plucked from the tea bushes. The first 3 leaves are used for making tea

2. Withering

   • Leaves are spread out to reduce moisture content.

3. Rolling

   • Leaves are twisted and rolled to break cell walls, releasing natural juices and enzymes.

4. Oxidation (Fermentation)

   • Rolled leaves are exposed to air, allowing oxidation.

   • Determines the type of tea:

     • Black tea: fully oxidized

     • Oolong tea: partially oxidized

     • Green tea: minimal oxidation

5. Drying/Firing

   • Leaves are dried using hot air or pan-firing to stop oxidation and reduce moisture.

6. Sorting & Grading

   • Dried tea is sorted by size and quality before packaging

   • 🍵 Key Chemical Components of Tea

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   Component	Function & Contribution
   Polyphenols	Includes catechins and flavonoids; responsible for astringency, antioxidant properties, and color. Present in high amounts in green tea.
   Amino Acids	Especially theanine; contributes to umami flavor and calming effects.
   Caffeine	Provides bitterness and stimulation; varies by tea type.
   Aromatic Compounds	Responsible for floral, fruity, and earthy aromas; released during brewing.
   Carbohydrates	Minor role; contributes to mouthfeel and sweetness.
   Proteins	Present in small amounts; influence infusion quality.
   Pigments	Chlorophyll and carotenoids affect leaf color and transformation during oxidation.
   Vitamins	Includes vitamin C, B-complex; more prevalent in fresh leaves.
   Minerals	Potassium, magnesium, and fluorine contribute to nutritional value.

   • Coffee

   • Botanical name: Coffea arabica/Coffea canephora
   • Family-Rubiaceae
   • Economically important part-Beans

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   Coffee is one of the most traded agricultural products worldwide, second only to crude oil in value among commodities.

   Over 25 million smallholder farmers in developing countries depend on coffee cultivation for income.

   Brazil, Vietnam, Colombia, and Ethiopia are leading producers and exporters, earning billions in foreign exchange.

   
   

   Processing of Coffee

   Harvesting – Coffee cherries are hand-picked or mechanically harvested.

   Pulping – The outer skin and pulp are removed.

   Fermentation – Beans are fermented to remove mucilage.

   Washing & Drying – Beans are washed and sun-dried or mechanically dried.

   Milling – Beans are hulled, polished, and graded.

   Roasting – Green beans are roasted to develop flavor and aroma.

   Grinding & Brewing – Roasted beans are ground and brewed into coffee beverages.

   ☕ Uses of Coffee

   Beverage: Brewed in diverse forms—espresso, cappuccino, instant, cold brew.

   Food Products: Coffee flavoring in desserts, chocolates, ice creams.

   Industrial Uses: Coffee grounds used in compost, biofuels, and skincare.

   Cultural Role: Integral to café culture, hospitality, and social rituals worldwide.

   ☕ Key Chemical Components of Coffee

   Component	Role & Contribution
   Caffeine	Primary alkaloid; provides stimulation, bitterness, and alertness.
   Trigonelline	An alkaloidthat breaks down during roasting, contributing to aroma and forming niacin (vitamin B3).
   Chlorogenic Acids	A majorgroup of phenolic compounds; responsible for acidity, antioxidant properties, and some bitterness.
   Diterpenes (Cafestol & Kahweol)	Found in coffee oils; contribute to flavor and have biological effects (can raise cholesterol in unfiltered coffee).
   Carbohydrates	Polysaccharides and sugars influence mouthfeel and sweetness, and caramelize during roasting.
   Lipids (Coffee Oils)	Provide body and richness; contribute to crema in espresso.
   Proteins & Amino Acids	Affect flavor precursors during roasting; contribute to Maillard reactions.
   Minerals	Potassium, magnesium, calcium, and trace elements add nutritional value.
   Volatile Aromatic Compounds	Hundreds of compounds are formed during roasting, responsible for coffee’s complex aroma (fruity, floral, smoky, nutty notes).

   🧪 Notes

   • Arabica vs. Robusta: Arabica beans generally have more lipids and sugars, giving a smoother flavor, while Robusta has higher caffeine and chlorogenic acids, resulting in stronger bitterness.

   • Roasting Impact: Chemical transformations during roasting (Maillard reaction, caramelization, breakdown of acids) create the characteristic flavor and aroma of brewed coffee.

   • 🌱  Cotton

     Botanical name: Gossypium hirsutum(90%)/ Gossypium barbadense, Family: Malvaceae, Economically important part: seed fibres.

     • Climate: Warm temperatures (21–30°C) and long frost-free periods are essential.

     • Soil: Deep, well-drained, fertile soils with good moisture retention are ideal.

     Planting

     • Varieties: Farmers choose between Upland cotton (the most common) and Pima cotton (longer staple, higher quality).

     • Sowing: Seeds are planted in rows, usually in spring, after soil preparation and fertilization.

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     Growth Stages

     1. Germination – Seeds sprout within 5–10 days.

     2. Vegetative Growth – Plants develop leaves and branches.

     3. Flowering – Cotton flowers bloom, then transform into bolls.

     4. Boll Formation – Bolls (fruit capsules) mature, containing cotton fibers and seeds.

     🌾 Harvesting Cotton

     Timing

     • Cotton is ready for harvest when bolls burst open, exposing fluffy white fibers.

     • Typically occurs 5–6 months after planting.

     Methods

     • Hand Picking: Traditional method, still common in India and parts of Africa. Produces cleaner cotton but is labor-intensive.

     • Mechanical Harvesting: Widely used in the U.S. and Australia. Machines strip or pick cotton bolls efficiently.

     Post-Harvest

     • Ginning: Separates cotton fibers from seeds.

     • Baling: Fibers are compressed into bales for transport to textile mills.

     • By-products: Cottonseed is processed into oil, animal feed, and other products.

     ⚖️ Key Considerations

     • Economic Impact: Cotton farming sustains millions of livelihoods globally.

     • Challenges: Pest infestations (like bollworms), high water usage, and price fluctuations.

     • Sustainability: Organic cotton and better irrigation practices are being adopted to reduce environmental impact.

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     Jute

   1. • Botanical name: Corchorus capsularis
      • Family-Malvaceae
      • Economically important part-Bast fibers

   • Climate: Jute requires a warm and humid climate with temperatures between 24–37°C.

   • Rainfall: Needs plenty of rainfall but cannot tolerate waterlogging.

   • Soil: Best grown in new alluvial soils of river basins; sandy loam and clay loam soils are also suitable.

   Sowing

   • Season: Jute is a rainy-season crop, sown from March to May depending on rainfall.

   • Method: Seeds are broadcast or line-sown after the first showers.

   • Fertilization: Compost, farmyard manure, and fertilizers like nitrogen, phosphorus, and potash are applied.

   Growth

   • Plants grow rapidly, reaching 2–4 meters in height within 3–4 months.

   • Interculturing (weeding and thinning) is essential in the early stages.

   • Pest management is required to protect young plants.

   🌾 Harvesting Jute

   Timing

   • Jute is harvested 100–120 days after sowing, when plants start flowering.

   • Harvesting too early reduces fiber yield, while late harvesting makes fibers coarse.

   Method

   • Plants are cut close to the ground with sickles.

   • Bundles are tied and left in the field for a few days before retting.

   Retting & Fiber Extraction

   • Retting: Bundles are submerged in water (ponds, canals, or rivers) for 2–3 weeks. Microbial action loosens fibers from the stalk.

   • Fiber Extraction: Fibers are stripped from stalks, washed, and dried.

   • Use: Fibers are used to make ropes, sacks, carpets, mats, and eco-friendly packaging materials.

   ⚖️ Economic Importance

   • Jute is called the “Golden Fiber” due to its luster and economic value.

   • India and Bangladesh are the world’s largest producers.

   • Provides raw material for the jute industry, supporting millions of farmers and workers