Tea

The spatial distribution of tea is governed by the strict interplay of thermal regimes, moisture availability, and soil chemistry.

• Requires temperatures consistently between 20°C and 30°C; temperatures below 10°C or above 35°C retard vegetative flush growth.
• Annual rainfall must exceed 1500 mm, uniformly distributed without prolonged dry spells.
• Absolute intolerance to waterlogging; necessitates well-drained undulating topography (slopes of 15-30 degrees) to prevent root stagnation.
• Prefers deep, friable, acidic soils (pH 4.5 to 5.8) rich in organic matter, iron, and potash.
• Photoperiod: High sunshine hours coupled with high relative humidity enhance the accumulation of polyphenols and catechins.

• Optimum temperature: 20°C-30°C.
• Critical rainfall threshold: >1500 mm.
• Soil pH requirement: 4.5 to 5.8 (Acidic).

Global tea production is concentrated in Monsoon Asia, driven by historical plantation development and favorable tropical-subtropical climates.

• China is the world's leading producer, dominated by green and specialized teas across provinces like Fujian, Yunnan, and Zhejiang.
• India ranks as the second-largest global producer, concentrated in Assam, West Bengal (Darjeeling, Dooars), and the Nilgiri hills of South India.
• Sri Lanka (formerly Ceylon) specializes in high-grown orthodox black teas in the central highlands (Nuwara Eliya, Kandy).
• Kenya is Africa's leading producer and a major global exporter, leveraging high-altitude equatorial slopes in the East African Rift.
• Other notable producers include Vietnam, Indonesia, Turkey (Black Sea coast), and Bangladesh (Sylhet region).

• Top producers: China, India, Kenya, Sri Lanka.
• African production is dominated by Kenya's Rift Valley plantations.
• South Asian producers focus heavily on CTC (Crush, Tear, Curl) black tea.

India's tea geography is sharply divided into Northeastern and Southern macro-regions, dictated by monsoon dynamics and relief.

• North-East India accounts for over 80% of national production, anchored in the Brahmaputra and Surma river valleys of Assam.
• Darjeeling hills (West Bengal) produce GI-tagged orthodox tea grown at elevations ranging from 600 to 2000 meters.
• Dooars and Terai regions at the foothills of the Himalayas provide high-volume CTC tea.
• South India features the Nilgiri Hills (Tamil Nadu, Kerala, Karnataka), where production occurs year-round due to proximity to the equator.
• Emerging nontraditional regions include Himachal Pradesh (Kangra tea), Uttarakhand, and parts of Bihar and Tripura.

• Assam produces the highest volume in India.
• Darjeeling holds the first-ever Indian GI tag for high-altitude orthodox tea.
• South Indian production benefits from bimodal rainfall and lack of severe winter dormancy.

Tea cultivation represents classic plantation agriculture characterized by vertical integration, heavy labor dependency, and agro-industrial processing.

• Operates on large landholdings with heavy capital investment in processing factories located adjacent to estates to prevent leaf fermentation.
• Labor-intensive industry employing predominantly female workforce for selective plucking (two leaves and a bud).
• Processing bifurcates into CTC (mass-market, domestic consumption) and Orthodox (export-oriented, whole leaf).
• Subject to global market price volatility, climate change vulnerability, and labor welfare legislations (e.g., Plantation Labour Act in India).
• Dominated by corporate entities and organized cooperatives, shifting gradually toward smallholder cultivation (bought-leaf factories).

• Plucking standard: Two leaves and a bud.
• Processing types: CTC vs Orthodox.
• High reliance on rural female labor force.