🔅Sorghum -- The Camel Crop (Complete Cultivation Guide)

In India’s Deccan plateau, where black cotton soils bake under the semi-arid sun, sorghum stands tall through months of scanty rainfall. Farmers call it the “Camel Crop” because, like the camel in a desert, sorghum survives prolonged drought through its deep roots, waxy leaves, and leaf-rolling ability. As the King of Coarse Cereals, it commands the largest area among all millets and offers grain, fodder, and even biofuel.

In the previous lessons, we covered the major cereals — Rice, Wheat, Barley, and Maize. Now we move to the millets, which dominate dryland agriculture and are collectively the 4th most widely cultivated food crop group globally.

This chapter covers:

1. Millets overview — India’s position, C4 advantage
2. Sorghum basics — botany, Pellagra, and amino acid profile
3. Climate, soil, and cultivation — drought and waterlogging tolerance
4. HCN toxicity — the critical safety concern for livestock
5. Hybrids and varieties — CSH series, sweet sorghum, biofortified types
6. Pests and diseases — stem borer, shoot fly, grain mould

All sections are high-yield for IBPS AFO, NABARD, and RRB SO exams.

Millets — The Big Picture

• India, Nigeria, and China are the largest millet producers globally. Millets are the 4th most widely cultivated food crop after rice, wheat, and maize.
• Coarser millets include Jowar (sorghum), Bajra (pearl millet), and Ragi (finger millet). ^{NABARD 2021}
• All millets belong to the C4 group — they use the Hatch-Slack pathway for more efficient carbon fixation in hot, dry conditions, losing less water per unit of carbon gained.

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Sorghum / Jowar — Basics

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Pellagra — The Sorghum-Linked Disease

• Excess leucine in sorghum inhibits the enzyme kynurenine hydroxylase, blocking conversion of tryptophan into niacin (Vitamin B3).
• When sorghum is the staple diet without supplementation, Pellagra disease results from Niacin (B3) deficiency.
• Symptoms = 4 Ds: Diarrhea, Dermatitis, Dementia, Death.

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Climate

• Sorghum’s dual tolerance to both drought and waterlogging is unusual among crops, making it exceptionally versatile for dryland farming.

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Soil

• Best on clay loam or loam texture (good balance of moisture retention and drainage).
• Tolerates pH 6.0-8.5 (considerable salinity and alkalinity tolerance).
• The black cotton soils (Vertisols) of central India are excellent — high clay content provides moisture-holding capacity during dry spells.

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Seed Rate and Sowing

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Morphology and Botany

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Hybrids and Key Varieties

Cultural Practices

• Thinning at 12-15 cm within the row ensures adequate space, light, and nutrients per plant.

HCN Toxicity — Critical Safety Warning

• Sorghum leaves at the knee stage contain high levels of HCN (from Dhurrin alkaloid), which is poisonous to livestock.
• HCN is synthesised by roots and concentrated in upper leaves during the first 40-50 days.
• Fodder should only be used after 50% flowering when dhurrin concentration falls to safe levels.
• Drought stress increases HCN because growth slows but dhurrin production continues.
• A dose of 0.5 g HCN per animal can be lethal.

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Varieties of Sorghum

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Diseases

Major diseases include Grain mould (Fusarium, Aspergillus — especially problematic in Kharif when rain occurs at grain maturity), Downy mildew (Peronosclerospora sorghi), Anthracnose (Colletotrichum graminicola), and Charcoal rot (Macrophomina phaseolina). Management: resistant varieties, crop rotation, timely fungicide application.

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Insect Pests

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Harvesting and Yield

• Harvest when grains are hard with less than 25% moisture (physiological maturity).
• Grain (irrigated): 25-30 q/ha.
• Fodder: 300-400 q/ha.

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Important Sorghum Varieties ^{Asked in AFO/NABARD}

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Summary Table — Sorghum at a Glance

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Sorghum: Why It’s the “Camel Among Crops” — Practical Guide

Sorghum thrives where other cereals fail: It tolerates drought (400-600 mm rainfall), heat, and alkaline soils (pH up to 8.5). This makes it the ideal cereal for dryland/rainfed farming in Deccan India.

Critical safety issue — HCN toxicity:

Sorghum produces dhurrin (a cyanogenic glucoside) in young leaves that converts to hydrogen cyanide (HCN) — toxic to livestock. This is exam-critical:

• Safe to graze/cut for fodder only after 50% flowering stage
• Young regrowth after cutting or drought-break is most dangerous
• HCN content decreases with plant maturity and proper sun-drying

Pellagra connection: Sorghum grain has excess leucine which inhibits conversion of tryptophan to niacin (Vitamin B3). Populations dependent on sorghum as staple can develop pellagra — the disease of “4 Ds”: Dermatitis, Diarrhoea, Dementia, Death. This is why balanced diets and biofortified varieties (like Parbhani Shakti with higher iron + zinc) matter.

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Summary Cheat Sheet