💰 Commercial Crops
Cultivation of sugarcane, cotton, jute, and tobacco for CUET Agriculture
Commercial crops (also called cash crops) are grown primarily for sale in the market rather than for the farmer's own consumption. Unlike foodgrains, these crops undergo significant industrial processing before reaching consumers — sugarcane becomes sugar, cotton becomes textile, jute becomes fibre products, and tobacco becomes cigarettes or chewing products. Understanding their cultivation, processing, and unique features is essential for CUET Agriculture.
1. Sugarcane (Saccharum officinarum)
Sugarcane is a tall, perennial grass that stores sucrose in its thick stems (canes). It is one of the most water-intensive crops after rice and has the longest crop duration among major field crops — taking 10-18 months from planting to harvest. India is the world's 2nd largest producer of sugarcane (after Brazil) and has the largest area under sugarcane cultivation.
| Parameter | Details |
|---|---|
| Family | Poaceae (Gramineae) |
| Origin | New Guinea / South-East Asia |
| Chromosome number | Variable (complex polyploid; 2n = 80-120+) |
| Type | Annual crop (harvested at 10-18 months); C4 plant; cross-pollinated |
| India's rank | 2nd largest producer (after Brazil); largest area under sugarcane |
| Top states | UP (largest), Maharashtra, Karnataka, Tamil Nadu, Bihar |
| Sucrose content | 10-14% in juice |
Climate and Soil:
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Commercial crops (also called cash crops) are grown primarily for sale in the market rather than for the farmer's own consumption. Unlike foodgrains, these crops undergo significant industrial processing before reaching consumers — sugarcane becomes sugar, cotton becomes textile, jute becomes fibre products, and tobacco becomes cigarettes or chewing products. Understanding their cultivation, processing, and unique features is essential for CUET Agriculture.
1. Sugarcane (Saccharum officinarum)
Sugarcane is a tall, perennial grass that stores sucrose in its thick stems (canes). It is one of the most water-intensive crops after rice and has the longest crop duration among major field crops — taking 10-18 months from planting to harvest. India is the world's 2nd largest producer of sugarcane (after Brazil) and has the largest area under sugarcane cultivation.
| Parameter | Details |
|---|---|
| Family | Poaceae (Gramineae) |
| Origin | New Guinea / South-East Asia |
| Chromosome number | Variable (complex polyploid; 2n = 80-120+) |
| Type | Annual crop (harvested at 10-18 months); C4 plant; cross-pollinated |
| India's rank | 2nd largest producer (after Brazil); largest area under sugarcane |
| Top states | UP (largest), Maharashtra, Karnataka, Tamil Nadu, Bihar |
| Sucrose content | 10-14% in juice |
Climate and Soil:
- Temperature: 20-35 °C; a tropical/subtropical crop that is frost-sensitive. Warm, sunny days promote sugar accumulation in the stems.
- Rainfall: 100-150 cm; the long growing period (10-18 months) requires adequate and sustained moisture throughout. This is why sugarcane needs 25-35 irrigations.
- Soil: Deep, well-drained loam to clay loam with pH 6.5-7.5. Deep soils are needed to support the extensive root system and heavy cane crop.
NOTE
Sugarcane is propagated vegetatively by setts (stem cuttings with 2-3 buds), NOT by seeds. The buds on the sett sprout to produce new shoots. This is fundamentally different from most field crops which are seed-propagated. Each "seed" is actually a piece of stem containing viable buds.
Cultivation:
| Practice | Details |
|---|---|
| Planting material | Setts (stem cuttings with 2-3 buds) — NOT seeds |
| Seed rate | 35,000-40,000 three-budded setts/ha (6-8 tonnes setts) |
| Spacing | 75-90 cm row spacing |
| Planting time | Autumn: October; Spring: February-March (Spring planting preferred — higher yields) |
| Fertilizer (NPK) | 150-60-60 kg/ha (plant crop); N in 3 splits |
| Irrigation | 25-35 irrigations; most water-demanding crop after rice |
| Critical stages | Germination, Tillering, Grand growth |
| Duration | 10-18 months (plant crop); 10-12 months (ratoon) |
| Yield | 80-120 tonnes/ha (cane); 8-12% sugar recovery |
Key Points:
-
Ratoon crop — After the main (plant) crop is harvested, the stubble left in the field sprouts again to produce a new crop without replanting. This is called ratooning. While ratoon crop yields are lower (15-20% less), the production cost is also much lower because there is no planting expense. Typically 1-2 ratoon crops are taken before replanting.
-
Earthing up at 3-4 months after planting is essential — soil is mounded around the base of the canes to prevent lodging (falling over) of the tall, heavy stems.
-
Trash mulching — Leaving dried leaves (trash) on the soil surface as mulch after harvest. This conserves moisture, controls weeds, adds organic matter, and eliminates the need for burning (which causes pollution).
Sugarcane Diseases and Pests — Details
Major Diseases:
- Red rot (Colletotrichum falcatum) — the most important disease of sugarcane. Infected canes show red discolouration of internal tissues with white transverse patches. It causes drying and death of canes. Control: Use resistant varieties, healthy seed cane, and hot water treatment of setts.
- Smut (Ustilago scitaminea) — a black whip-like structure (smut whip) emerges from the shoot tip, consisting of fungal spores. Infected shoots become thin and grassy.
- Grassy Shoot Disease (phytoplasma) — produces numerous thin, grass-like tillers.
Major Pests:
- Top borer and Internode borer — bore into stems, creating tunnels
- Pyrilla (sugarcane leafhopper) — a major sucking pest
- White grub — feeds on roots underground
- Jaggery (Gur) and Khandsari are traditional unrefined sugar products made by small-scale processing. Jaggery retains minerals and has a distinct flavour.
- By-products of sugar mills are economically important: Bagasse (crushed cane residue — used as fuel in sugar mills and for paper manufacturing), Molasses (thick syrup left after sugar crystallization — used for ethanol and alcohol production), Press mud (filter cake — excellent soil amendment rich in organic matter and phosphorus).
Varieties: Co-0238 (most popular in UP), CoC-671, Co-86032, CoS-767
2. Cotton (Gossypium spp.)
Cotton is called "White Gold" or "King of Fibres" because of the immense economic value of its fibre (lint). India has the largest area under cotton in the world and is the 2nd largest producer (after China). Cotton is unique because it has four cultivated species — two diploid (Indian origin) and two tetraploid (American origin).
| Parameter | Details |
|---|---|
| Family | Malvaceae |
| Origin | India (G. arboreum, G. herbaceum); America (G. hirsutum, G. barbadense) |
| Chromosome number | Diploid: 2n = 26 (Desi); Tetraploid: 2n = 52 (American/Sea Island) |
| Type | Kharif crop; often cross-pollinated; C3 plant |
| India's rank | Largest area under cotton; 2nd largest producer (after China) |
| Top states | Gujarat (largest), Maharashtra, Telangana, Karnataka, MP |
Cotton Species:
This is a critical table for CUET — cotton is the only major crop with 4 cultivated species:
| Species | Type | Fibre Quality | Origin |
|---|---|---|---|
| G. hirsutum (American Upland) | Tetraploid (2n=52) | Medium staple; 90% of India's area | Central America |
| G. barbadense (Sea Island/Egyptian) | Tetraploid (2n=52) | Long staple (finest quality) | South America |
| G. arboreum (Desi/Tree cotton) | Diploid (2n=26) | Short staple (coarse) | India |
| G. herbaceum (Desi/Levant) | Diploid (2n=26) | Short staple (coarse) | India/Africa |
IMPORTANT
Remember: Diploid (2n=26) species are of Indian origin (G. arboreum, G. herbaceum) and produce short, coarse fibre. Tetraploid (2n=52) species are of American origin (G. hirsutum, G. barbadense) and produce medium to long, fine fibre. G. hirsutum dominates with 90% of India's cotton area.
Climate and Soil:
- Temperature: 21-35 °C; warm weather with 200+ frost-free days needed for the long crop duration.
- Rainfall: 50-100 cm; cotton cannot tolerate waterlogging — it causes root death and boll rot.
- Soil: Deep black cotton soil (Regur) is ideal — these soils have high water-holding capacity and swell when wet (shrink-swell clays). Well-drained; pH 6.0-8.0.
- Requires clear sunny days during boll opening — rain at this stage damages fibre quality and promotes boll rot.
Cultivation:
| Practice | Details |
|---|---|
| Seed rate | 2-3 kg/ha (Bt hybrids); 15-20 kg/ha (desi varieties) |
| Spacing | 90-120 x 45-60 cm (hybrids — wide spacing for large, bushy plants) |
| Sowing time | April-May (irrigated); June-July (rainfed, with monsoon onset) |
| Fertilizer (NPK) | 80-40-40 kg/ha (desi); 120-60-60 kg/ha (Bt hybrids) |
| Duration | 150-200 days |
| Yield | 15-25 q/ha (lint); measured in bales (1 bale = 170 kg lint) |
Key Points:
- Bt Cotton — Transgenic cotton containing the Bacillus thuringiensis gene (Cry1Ac, Cry2Ab) that produces a protein toxic to bollworm larvae. Introduced in India in 2002, Bt cotton increased yields dramatically. Today, >95% of India's cotton area is under Bt cotton.
WARNING
Bt cotton controls bollworms (American bollworm Helicoverpa, Pink bollworm Pectinophora) — these are the most damaging pests. However, sucking pests (whitefly, jassids, aphids, mealybug) are NOT controlled by Bt — they need separate management through insecticides or IPM. This distinction is important for CUET.
- Cotton is called "White Gold" or "King of Fibres"
- Fibre quality is measured by staple length (mm) — longer staple means finer, stronger fibre — and micronaire (a measure of fineness/maturity)
- Ginning — The industrial process of separating lint (fibre) from the seed after harvest
- Ginning percentage = (Weight of lint / Weight of seed cotton) x 100; typically 33-38%. This means about one-third of harvested cotton by weight is fibre, and two-thirds is seed.
Varieties/Hybrids: Various Bt hybrids (Bollgard I and II); MCU-5, Suraj, H-6
3. Jute (Corchorus capsularis and C. olitorius)
Jute is called the "Golden Fibre" — it is the second most important natural fibre after cotton globally. India is the largest producer of jute in the world, contributing about 60% of global production. West Bengal alone accounts for approximately 75% of India's jute production. Jute is valued for its biodegradable, eco-friendly nature, making it relevant in the context of reducing plastic use.
| Parameter | Details |
|---|---|
| Family | Malvaceae (formerly Tiliaceae) |
| Origin | Indo-Burma region |
| Chromosome number | 2n = 14 |
| Type | Kharif; cross-pollinated; C3 plant |
| India's rank | Largest producer globally (~60% of world production) |
| Top states | West Bengal (largest, ~75%), Bihar, Assam, Odisha |
Species:
- C. capsularis (White jute/Deshi pat) — Tolerates waterlogging; produces a spherical capsule. More common in flood-prone areas of Bengal.
- C. olitorius (Tossa jute) — Produces better fibre quality; elongated capsule. This is the major species in commercial cultivation.
Climate and Soil:
- Temperature: 24-37 °C; hot and humid climate is essential for jute — it needs high temperatures and humidity for rapid vegetative growth.
- Rainfall: 125-200 cm; high humidity is required for good fibre quality.
- Soil: Alluvial loam is ideal; well-drained; pH 5.5-8.0. The flood plains of the Ganges-Brahmaputra delta in Bengal provide perfect conditions — rich alluvial soil, high rainfall, and hot humid climate.
Cultivation:
| Practice | Details |
|---|---|
| Seed rate | 5-7 kg/ha |
| Spacing | 20-25 x 5-7 cm (dense planting for tall, straight stems) |
| Sowing time | March-May (depending on species and region) |
| Fertilizer (NPK) | 60-30-30 kg/ha |
| Duration | 100-150 days (harvested at small pod stage for best fibre quality) |
| Yield | 25-35 q/ha (dry fibre) |
IMPORTANT
Retting is the most critical post-harvest operation in jute production. It involves soaking harvested jute plants in water for 10-15 days so that microorganisms decompose the pectins (gummy substances) binding the fibre to the stem. After retting, fibres are stripped from the stem by hand. The quality of retting determines the quality (colour, lustre, strength) of the final fibre.
Key Points:
- Types of retting: Stagnant water retting (most common), running water retting (best quality), chemical retting, ribbon retting
- Used to manufacture gunny bags, hessian cloth, carpet backing, geo-textiles, and decorative items
- Diversified jute products — Shopping bags, home furnishings, decorative items (jute diversification promotes demand in the era of plastic reduction)
- Jute Packaging Materials Act mandates the use of jute packaging for certain commodities (foodgrains, sugar), ensuring demand for jute products
Varieties: JRO-524 (Navin), JRO-204 (Suren), S-19, Shyamali
4. Tobacco (Nicotiana tabacum)
Tobacco is a unique commercial crop — it is cultivated for its leaves, which contain the alkaloid nicotine. It belongs to the family Solanaceae (the same family as tomato, potato, and brinjal). Tobacco cultivation and processing require specialized knowledge, particularly regarding curing methods which determine the type and market value of the product.
| Parameter | Details |
|---|---|
| Family | Solanaceae |
| Origin | South America (tropical America) |
| Chromosome number | 2n = 48 (amphidiploid: N. sylvestris x N. tomentosiformis) |
| Type | Kharif/Rabi (varies by type); self-pollinated; C3 plant |
| Top states | AP/Telangana, Gujarat, Karnataka, UP, Bihar |
Types of Tobacco:
Different types of tobacco are distinguished primarily by their curing method, which determines the chemical composition and end use of the leaf:
| Type | Curing Method | Growing Region |
|---|---|---|
| FCV (Flue-Cured Virginia) | Flue curing (hot air in barns) | AP, Karnataka — India's main export type |
| Bidi tobacco | Sun curing | Gujarat, Karnataka |
| Hookah/Chewing tobacco | Air/fire curing | UP, Bihar |
| Cigar tobacco | Air curing | Tamil Nadu, West Bengal |
NOTE
FCV (Flue-Cured Virginia) tobacco accounts for only about 30% of India's tobacco production but earns the highest export value. "Flue curing" involves passing hot air through pipes (flues) in closed barns to dry the leaves under controlled temperature. This produces bright, golden-yellow leaves with specific chemical properties desired for cigarette manufacturing.
Climate and Soil:
- Temperature: 20-30 °C; frost-sensitive.
- Soil: Light sandy loam for FCV tobacco (produces lighter-coloured, better quality leaf); heavy soils for Bidi tobacco; pH 5.5-6.5.
- Chloride-sensitive — this is a critical point: tobacco must never be given MOP (Muriate of Potash/KCl) because chloride causes dark, undesirable leaf colour and burning issues. Only SOP (Sulphate of Potash/K₂SO₄) should be used.
Cultivation:
| Practice | Details |
|---|---|
| Seed rate | 2.5-3 g/ha (transplanting from nursery; seeds are extremely tiny — among the smallest of any crop) |
| Spacing | 90-100 x 50-60 cm (wide spacing for large, broad leaves) |
| Fertilizer (NPK) | 40-60-100 kg/ha (high K requirement); use SOP not MOP |
| Duration | 90-120 days (after transplanting) |
| Yield | FCV: 15-20 q/ha; Bidi: 10-15 q/ha |
Key Points:
- Nicotine — the main alkaloid in tobacco leaves (2-8% concentration). Besides being the addictive substance in tobacco products, nicotine is also used as a natural insecticide in organic farming.
- Topping — The deliberate removal of the flower head before it blooms. This diverts nutrients from flower/seed production to leaf growth, increasing both leaf yield and quality (thicker, more nicotine-rich leaves).
- Desuckering — After topping, the plant responds by producing side shoots (suckers) from leaf axils. These must be manually removed to prevent nutrient diversion from the main leaves.
- Curing is the most critical post-harvest operation — it determines the quality and market price of tobacco. Different curing methods produce distinctly different products.
- Central Tobacco Research Institute (CTRI) — Located in Rajahmundry, Andhra Pradesh.
WARNING
Tobacco is chloride-sensitive. Never use MOP (Muriate of Potash) — always use SOP (Sulphate of Potash). Chloride in MOP causes poor leaf quality, dark colour, and poor burning characteristics. This is a commonly tested fact.
Varieties: Siri, Kanchan, Virginia Gold, Jayasri
Comparison of Commercial Crops
| Parameter | Sugarcane | Cotton | Jute | Tobacco |
|---|---|---|---|---|
| Season | Annual (10-18 months) | Kharif | Kharif | Kharif/Rabi |
| Top state | UP | Gujarat | West Bengal | AP |
| Propagation | Setts (vegetative) | Seeds | Seeds | Transplanting |
| India's rank | 2nd (after Brazil) | Largest area | Largest producer | 2nd/3rd |
| Key product | Sugar, jaggery, ethanol | Lint (fibre) | Golden Fibre | Nicotine, cigarettes |
| Nickname | - | White Gold | Golden Fibre | - |
Key Points for CUET
Quick Revision — Must-Remember Facts
- Sugarcane — propagated by setts (vegetative); ratoon cropping possible; Red rot (Colletotrichum falcatum) is the most important disease
- Bt Cotton — Introduced in India in 2002; controls bollworms but NOT sucking pests; >95% adoption
- Cotton has 4 cultivated species — 2 diploid of Indian origin (2n=26), 2 tetraploid of American origin (2n=52)
- G. hirsutum covers 90% of India's cotton area; G. barbadense has the finest fibre quality
- Jute — "Golden Fibre"; retting is the key post-harvest operation; India produces 60% of world supply
- Tobacco is chloride-sensitive — always use SOP, never MOP
- Topping and desuckering in tobacco increase leaf yield
- Sugarcane by-products: Bagasse (paper, fuel), Molasses (ethanol), Press mud (soil amendment)
- Ginning separates lint from seed cotton; ginning percentage is typically 33-38%
- 1 bale of cotton = 170 kg lint
Summary Cheat Sheet
| Concept / Topic | Key Details / Explanation |
|---|---|
| Sugarcane | Saccharum officinarum; Poaceae; C4; complex polyploid (2n = 80-120+) |
| Sugarcane — India rank | 2nd largest producer (after Brazil); largest area |
| Sugarcane — Top state | UP (largest) |
| Sugarcane — Propagation | Setts (stem cuttings with 2-3 buds) — vegetative, NOT seeds |
| Sugarcane — Duration | 10-18 months (longest among field crops) |
| Sugarcane — Water | 1500-2000 mm; 25-35 irrigations |
| Sugarcane — Fertilizer | 150-60-60 NPK; yield 80-120 tonnes/ha |
| Sugarcane — Ratoon | Regrowth from stubble; lower yield but lower cost |
| Red rot | Colletotrichum falcatum; most important sugarcane disease |
| Sugarcane by-products | Bagasse (fuel/paper), Molasses (ethanol), Press mud (amendment) |
| Cotton | Gossypium spp.; Malvaceae; C3; "White Gold" / "King of Fibres" |
| Cotton — India rank | Largest area; 2nd largest producer (after China) |
| Cotton — 4 species | G. hirsutum (tetraploid 2n=52, 90% area), G. barbadense (2n=52, finest), G. arboreum + G. herbaceum (diploid 2n=26, Indian origin) |
| Bt Cotton | Introduced India 2002; Cry1Ac + Cry2Ab; controls bollworms but NOT sucking pests; >95% adoption |
| Cotton — Seed rate | 2-3 kg/ha (Bt hybrids) |
| Ginning percentage | 33-38%; 1 bale = 170 kg lint |
| Jute | Corchorus spp.; Malvaceae; 2n = 14; "Golden Fibre" |
| Jute — India rank | Largest producer (~60% world); top state: West Bengal (~75%) |
| Jute — Retting | Soaking in water 10-15 days; microbes decompose pectins; determines fibre quality |
| Jute — Climate | Hot humid; rainfall 125-200 cm; alluvial loam |
| Tobacco | Nicotiana tabacum; Solanaceae; 2n = 48 (amphidiploid) |
| Tobacco — Types | FCV (flue-cured, main export), Bidi (sun-cured), Hookah (air/fire), Cigar (air) |
| Tobacco — Chloride sensitive | Never use MOP; always use SOP (Sulphate of Potash) |
| Tobacco — Seed rate | 2.5-3 g/ha (extremely tiny seeds; transplanted) |
| Tobacco — Topping | Remove flower head → diverts nutrients to leaf growth |
| Tobacco — Nicotine | Main alkaloid (2-8%); also used as natural insecticide |
| CTRI location | Rajahmundry, Andhra Pradesh |
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