🌾 Sesame (Til) Production Technology
Production guide for sesame covering Queen of Oilseeds status, geocarpy avoidance, phyllody disease, capsule shattering management, and comparison with other Kharif oilseeds.
This lesson covers practical sesame production technology with focus on establishment, capsule retention, disease management, and quality oilseed output.
Importance of Sesame
Sesame (Sesamum indicum) is one of the oldest cultivated oilseed crops in human history, with origins tracing back to the Indus Valley Civilization (~5,000 years ago). It is called the "Queen of Oilseeds" due to its premium oil quality, extraordinary stability, and distinctive flavour.
Key features:
- Oil content: 46–52% (one of the highest among oilseed crops)
- Contains powerful natural antioxidants: sesamin and sesamolin (lignans); responsible for exceptional oxidative stability of sesame oil
- India is the largest producer of sesame globally, followed by Sudan, Myanmar, and Tanzania
- Major producing states in India: Gujarat, Rajasthan, Madhya Pradesh, West Bengal, Uttar Pradesh, Tamil Nadu
- Used in confectionery (til laddoo, tahini), edible oil, pharmaceutical and cosmetic industries
- High-temperature stability of sesame oil makes it suitable as frying oil and finishing oil in Asian cuisines
Botanical Classification
- Scientific name: Sesamum indicum L.
- Family: Pedaliaceae (sometimes placed in Pedaliaceae within Lamiales)
- Chromosome number: 2n = 26
- Pollination: Primarily self-pollinated; some cross-pollination by insects
- Growth habit: Erect annual herb; 60–120 cm tall; opposite lower leaves, alternate upper leaves; tubular, bell-shaped flowers (white, pink, or purple); capsules in leaf axils
- Stem cross-section: Quadrangular (four-angled) — distinguishing morphological feature
- Fruit: Capsule with 4–8 locules; each capsule contains 50–100 seeds
Determinate vs Indeterminate Types
| Type | Feature | Implication |
|---|---|---|
| Determinate | Defined top to plant; uniform maturity | Easier one-cut harvest; less shattering |
| Indeterminate | Continues flowering upward; uneven maturity | Multiple harvests possible; shattering risk high |
Most commercial sesame varieties are indeterminate — a significant challenge for mechanized harvesting.
Climate Requirements
- Temperature: 25–37°C; warm-season crop; cannot tolerate frost
- Rainfall: 500–750 mm; drought tolerant (taproot extracts deep soil moisture)
- Extremely sensitive to waterlogging: Even 2–4 days of waterlogging causes severe root rot and plant death — the single biggest constraint limiting sesame area expansion
- Low humidity preferred at maturity — high humidity promotes capsule shattering and disease
- Sesame responds well to full sunlight; shade reduces yield severely
Soil Requirements
- Well-drained sandy loam or light-textured soils preferred
- pH: 5.5–7.0; slightly acidic to neutral
- Light soils allow deep root development and avoid waterlogging
- Heavy clay soils are unsuitable (poor drainage → root rot)
- Does not tolerate acidic soils well below pH 5.5
Varieties
- TMV-3: Tamil Nadu Agricultural University (TNAU); most popular in Tamil Nadu; medium-duration
- JT-21: JNKVV, Jabalpur; Madhya Pradesh-adapted
- Vinayak (GT-1): Gujarat; white-seeded; Kharif-adapted
- Pragati: ICAR-DOR; medium duration; white seed
- Kiran: ICAR; resistant to phyllody disease — important disease-resistance trait
- E-8: IARI, Delhi; early maturing (70–75 days)
Seed Rate
- Seed rate: 4–5 kg/ha
- Sesame seeds are very small (1,000 seed weight = 2–3 g); pure seed is essential
- Seed mixing: Sesame seeds mixed with fine sand or dry soil at 1:10 ratio for uniform broadcasting or line sowing — prevents clumping and ensures uniform distribution
- Spacing: 30×10 cm (after thinning); rows 30 cm apart
Sowing
- Season: June–July (Kharif onset with monsoon)
- Seeds require adequate soil moisture for germination (germinates in 3–4 days at 28–32°C)
- Sowing method: Line sowing preferred over broadcasting for better management
- Depth: 2–3 cm (shallow; seeds too small for deep placement)
- Thinning: At 15 DAS to desired plant population (2 plants/hill)
Nutrient Management
- Recommended NPK: 30:20:20 kg/ha
- Relatively low nutrient requirements — typical of stress-adapted crops
- Caution with N: Excessive nitrogen promotes vegetative growth at the expense of oil yield; stimulates branching without proportional increase in capsule number
- Sulphur: 20 kg/ha as gypsum or SSP; important for oil quality and amino acid synthesis
- Basal application: Full P, K, and half N at sowing; remaining N at 30–35 DAS
Weed Management
- Critical period: First 30 DAS
- Pre-emergence herbicide: Pendimethalin 0.75 kg ai/ha (within 48 hrs of sowing)
- 2 hand weedings at 20 and 40 DAS
- Light inter-cultivation at 25–30 DAS; avoid deep cultivation (roots near surface)
Water Management
- 3–4 supplemental irrigations in drought conditions
- Critical: Do NOT allow waterlogging even temporarily — fatal to the crop
- Use raised bed or broad-bed furrow system in areas with heavy rainfall to ensure drainage
- Critical stages: Germination, branching/flower bud development, seed fill
- Terminal drought tolerance through deep root system
Integrated Pest Management (IPM)
Major Pests
| Pest | Damage | Management |
|---|---|---|
| Gall midge (Asphondylia sesami) | Gall formation on capsules; yield loss | Quinalphos 0.05% spray |
| Hawk moth (Acherontia styx) | Large caterpillar; defoliator | Hand-picking larvae; Quinalphos |
| Flea beetle (Aphthona whitfieldi) | Tiny holes in leaves; seedling stage | Imidacloprid; early-stage spray |
| Leaf roller (Antigastra catalaunalis) | Rolls leaves; feeds inside | Lambda-cyhalothrin |
Major Diseases
| Disease | Pathogen | Management |
|---|---|---|
| Phyllody | Phytoplasma (transmitted by leafhoppers Orosius spp.) | Leaf-like structures replace flowers/petals; flower parts become green leafy structures (phyllody); early infection causes total yield loss; manage vector with imidacloprid; use phyllody-resistant Kiran variety |
| Cercospora leaf spot | Cercospora sesami | Angular brown spots on leaves; Mancozeb 0.2% spray; 2 applications at 15-day interval |
| Powdery mildew | Oidium sp. | White powdery coating on leaves; Sulphur dust or Tridemorph spray |
| Fusarium wilt | Fusarium oxysporum | Yellowing and wilting; soil-borne; seed treatment with Trichoderma; crop rotation |
Harvesting — The Shattering Challenge
Sesame harvesting is the most critical and technically challenging operation because:
- Indeterminate varieties have capsules at different stages simultaneously (lowest capsules mature first, upper ones still green)
- Capsule dehiscence (shattering): Capsules split open when fully dry, releasing seeds; significant yield loss if harvest is delayed
Harvest Procedure
- Timing: Harvest when lowest capsules begin to open (showing first signs of dehiscence) — do NOT wait for complete maturity
- Method: Cut stems at ground level with sickle; bundle immediately (10–15 plants per bundle)
- Drying: Stand bundles upright in sun on a clean tarpaulin for 5–7 days; capsules open and seeds fall onto tarpaulin
- Threshing: Beat dried bundles on a clean surface or over a tarpaulin to collect remaining seeds
- Cleaning: Winnow to separate seeds from chaff
- Mechanical combine harvesting is difficult due to indeterminate habit; determinate varieties (being developed) would facilitate mechanization
Yield and Post-Harvest
- Yield: 500–800 kg/ha (relatively low; reflects the low-input semi-subsistence nature of crop)
- Under improved management (irrigated, hybrid): up to 1.0 t/ha possible
- Oil extraction: Expeller press; cold-pressed sesame oil retains maximum antioxidants (lignans)
- Roasted sesame oil (Chinese/Japanese style): Different processing; intense nutty aroma
Comparison of Kharif Oilseed Crops
| Crop | Oil (%) | Protein (%) | Yield (t/ha) | Drought Tolerance | Waterlogging Tolerance |
|---|---|---|---|---|---|
| Sesame | 46–52 | 22–25 | 0.5–0.8 | High | Very Low |
| Groundnut | 46–50 | 25–28 | 2.0–3.5 | Moderate | Low |
| Soybean | 18–20 | 38–42 | 2.0–3.0 | Low | Very Low |
| Sunflower | 38–48 | 20–25 | 2.0–3.0 | Moderate | Low |
Summary Cheat Sheet
| Area | Key Exam Point |
|---|---|
| Crop identity | Sesame is the "Queen of Oilseeds" with premium oil quality |
| Key constraints | Capsule shattering and phyllody require timely intervention |
| Production edge | Suitable for low-input and stress-prone kharif systems |
References
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References
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