Sugar cane is a long-duration, high-biomass crop grown mainly in irrigated parts of Punjab, Sindh and Khyber Pakhtunkhwa. It provides sugar, molasses, bagasse and employment, but it also requires large amounts of water and rapid transport to mills after harvesting.
Learning outcomes
- Identify main sugar-cane areas.
- Explain climatic and water requirements.
- Describe the crop-to-sugar process.
- Evaluate economic benefits and water, pricing and pollution issues.
Requirements and distribution
Sugar cane needs a long warm growing season, fertile soil and dependable irrigation. It is grown in central and southern Punjab, parts of Sindh and irrigated valleys of Khyber Pakhtunkhwa. Frost can damage the crop, while water shortage reduces cane growth and sugar content.
Because cane is bulky and loses quality after cutting, mills normally locate within reach of producing areas.
Cultivation
Sections of cane are planted in furrows, irrigated and fertilised. Weeding, earthing up and pest control are carried out during the long growth period. Some fields produce ratoon crops from the previous roots, reducing planting cost but sometimes increasing disease risk.
Harvesting may be manual or mechanical. Delayed delivery lowers recoverable sugar, so transport and mill scheduling matter.
Processing and by-products
Cane is crushed to extract juice. The juice is clarified, concentrated and crystallised. Molasses is used in fermentation and chemicals, bagasse can fuel boilers or make board and paper, and press mud may be used as soil conditioner.
Using bagasse for combined heat and power can reduce dependence on external fuel and improve mill efficiency.
Economic issues
The industry links farmers, labourers, transporters, mills, wholesalers and food manufacturers. Government support prices and mill purchasing decisions influence planting. Disputes can arise over delayed payment, cane weight, sugar recovery and competition between food crops and cane.
If the market price is weak, farmers may switch crops; if support is too generous, cane may expand into water-stressed areas.
Environmental issues
Sugar cane has high irrigation demand. Inefficient flood irrigation increases seepage, waterlogging and salinity. Untreated mill wastewater has high organic content and can remove oxygen from rivers. Air pollution may result from burning cane residues.
Drip or furrow improvements, better scheduling, wastewater treatment and high-recovery varieties can reduce impact.
Key terms
sugar cane • ratoon crop • sugar recovery • molasses • bagasse • press mud • support price • combined heat and power
O Level examination guidance
- Explain mill location using perishability/bulk plus transport, water, power and market.
- Do not describe bagasse as waste only; it is a useful energy and industrial by-product.
- A balanced answer recognises employment and value but also water demand.
Review questions
- Why must harvested cane reach a mill quickly?
- What is a ratoon crop?
- Give two uses of bagasse.
- Why may cane expansion be controversial?
- How can mill pollution be reduced?
Suggested answers
- Sugar recovery falls as cut cane deteriorates.
- A new crop grown from the roots or stubble of the previous cane crop.
- Boiler fuel, electricity, paper or board – any two.
- It uses much water and may compete with food crops.
- Treat wastewater, reuse water and control residue burning.
Data and copyright note
These are original KG2UNI notes aligned to Cambridge O Level Pakistan Studies 2059 Paper 2 for the 2026 and 2027 examination syllabuses. Mineral, agricultural and energy quantities change over time; use the latest official statistics when a question provides or requires current numerical data. The notes do not reproduce textbook wording or copyrighted textbook diagrams.
