🌾 Cereal Crops
Cultivation practices of rice, wheat, maize, sorghum, and pearl millet for CUET Agriculture
Cereals are the most important group of food crops worldwide, belonging to the family Poaceae (Gramineae). They are cultivated primarily for their starchy edible grains and form the backbone of India's food security. The five major cereals — rice, wheat, maize, sorghum, and pearl millet — together account for the bulk of India's foodgrain production. Understanding their cultivation practices, climatic requirements, and distinguishing features is essential for CUET Agriculture.
1. Rice (Oryza sativa)
Rice is the staple food of more than half of the world's population and is the most important Kharif cereal in India. It thrives in warm, humid conditions and is unique among cereals for its ability to grow in standing water.
| Parameter | Details |
|---|---|
| Family | Poaceae (Gramineae) |
| Origin | South-East Asia (India/China — Vavilov) |
| Chromosome number | 2n = 24 |
| Type | Kharif crop; C3 plant; self-pollinated |
| India's rank | 2nd largest producer (after China); 1st in area |
| Top states | West Bengal, UP, Punjab, Tamil Nadu, Andhra Pradesh |
Climate and Soil:
- Temperature: 20-37 °C (optimum 25-30 °C); requires a warm and humid climate throughout the growing season. Rice is a tropical crop that cannot tolerate frost or very low temperatures, which damage the panicle and reduce grain set.
- Rainfall: 100-200 cm; rice can be grown in standing water, making it ideal for high-rainfall regions and irrigated lowlands.
- Soil: Clayey loam with good water retention is preferred because rice paddies need to hold water. The ideal pH is 5.5-6.5 — rice tolerates mild acidity better than most cereals.
Varieties:
- High Yielding: IR-8 (Miracle rice/Taichung native), Jaya, Padma, Pusa Basmati-1, Pusa-44, Swarna, BPT-5204 (Samba Mahsuri)
- Hybrid: KRH-2, PHB-71, Arize 6444
- Basmati: Pusa Basmati-1, Pusa Basmati-1121, Taraori Basmati
NOTE
IR-8 was the first High Yielding Variety of rice released in India in 1966, earning the title "Miracle Rice." It was developed at IRRI (International Rice Research Institute), Philippines, and marked the beginning of the Green Revolution in rice.
Cultivation:
| Practice | Details |
|---|---|
| Seed rate | Transplanting: 20-25 kg/ha; Direct seeded: 60-80 kg/ha |
| Nursery | 20-25 day old seedlings for transplanting |
| Spacing | 20 x 15 cm (transplanted) |
| Sowing time | Kharif: June-July (main); Rabi (Boro): November-December |
| Fertilizer (NPK) | 120-60-40 kg/ha (irrigated); N in 3 splits |
| Irrigation | Continuous submergence (2-5 cm); 1200-1400 mm total |
| Critical stages | Tillering, Panicle initiation, Flowering, Grain filling |
| Duration | 100-150 days |
| Yield | 40-60 q/ha (irrigated HYV) |
The transplanting method uses fewer seeds (20-25 kg/ha) compared to direct seeding (60-80 kg/ha) because seedlings are raised in a nursery and then carefully planted into the puddled main field. Nitrogen is applied in 3 splits — at basal, tillering, and panicle initiation — to match the crop's demand curve and reduce losses.
Special Practices:
- SRI (System of Rice Intensification): A water-saving method that uses young seedlings (8-12 days old), plants a single seedling per hill at wider spacing (25x25 cm), and employs Alternate Wetting and Drying (AWD) irrigation instead of continuous flooding. SRI can save 30-50% water while maintaining or even increasing yields.
- Direct Seeded Rice (DSR): Seeds are sown directly in the field without transplanting, saving both water and labour. This is gaining popularity due to labour shortages and water scarcity.
- Puddling: The process of churning wet soil to create an impervious subsurface layer that reduces water percolation. This is essential in transplanted rice to maintain standing water in the field.
2. Wheat (Triticum aestivum)
Wheat is India's second most important foodgrain after rice, and the principal Rabi (winter) cereal. It requires cool temperatures during vegetative growth and dry, warm conditions during grain filling, making the Indo-Gangetic Plains ideal for its cultivation.
| Parameter | Details |
|---|---|
| Family | Poaceae (Gramineae) |
| Origin | South-West Asia (Fertile Crescent — Vavilov) |
| Chromosome number | 2n = 42 (hexaploid — AABBDD genome) |
| Type | Rabi crop; C3 plant; self-pollinated |
| India's rank | 2nd largest producer (after China) |
| Top states | UP, MP, Punjab, Haryana, Rajasthan |
Climate and Soil:
- Temperature: 15-25 °C (a cool season crop); some varieties require vernalization (exposure to cold temperatures) to trigger flowering. This is why wheat performs best when sown in November.
- Rainfall: 75-100 cm; cool and dry weather during grain filling is preferred. Hot, dry winds during grain filling cause terminal heat stress, which is the biggest abiotic threat to wheat yields in India.
- Soil: Well-drained loam to clay loam with pH 6.0-7.5. Wheat cannot tolerate waterlogging, which damages roots and promotes diseases like foot rot.
IMPORTANT
Wheat is a hexaploid species with the genome formula AABBDD and 2n = 42 chromosomes. This is a frequently tested fact in CUET. The three genomes came from three different ancestral species through natural hybridization and polyploidy events.
Varieties:
- Bread wheat (T. aestivum): HD-2967, HD-3086, PBW-343, WH-1105, DBW-17, Lok-1, GW-366
- Durum wheat (T. durum): Used for macaroni/pasta — HI-8498, PDW-233. Durum wheat has a harder grain and higher protein content, making it suitable for pasta products.
Cultivation:
| Practice | Details |
|---|---|
| Seed rate | 100-125 kg/ha (normal); 125-150 kg/ha (late sown — higher rate compensates for fewer tillers) |
| Spacing | Row spacing: 20-22.5 cm (timely); 15-18 cm (late sown — narrower rows for better ground cover) |
| Sowing time | Timely: November 1-15; Late: December |
| Fertilizer (NPK) | 120-60-40 kg/ha (irrigated); N in 2-3 splits |
| Irrigation | 4-6 irrigations; CRI (21 DAS) most critical |
| Critical stages | CRI, Tillering, Jointing, Flowering, Milk, Dough |
| Duration | 120-150 days |
| Yield | 40-55 q/ha (irrigated HYV) |
Key Points:
- CRI stage (Crown Root Initiation, 21 DAS) — the most critical irrigation in wheat. Missing irrigation at CRI causes severe yield loss because the crown roots, which are the main root system of wheat, develop at this stage.
- Late sowing reduces yield by approximately 25-30 kg/ha per day of delay after November 15, because the crop gets exposed to terminal heat stress during grain filling.
- Raised bed planting saves 25-30% water by reducing the wetted area while maintaining yields.
- Zero tillage — Direct sowing of wheat after rice harvest without ploughing; saves time, fuel, and water. This practice has been widely adopted in the rice-wheat system of Punjab and Haryana.
3. Maize (Zea mays)
Maize is one of the most versatile cereals, grown for food, feed, and industrial purposes. It is called the "Queen of Cereals" because of its enormous genetic diversity and wide range of uses — from human consumption to animal feed, starch, and ethanol production.
| Parameter | Details |
|---|---|
| Family | Poaceae (Gramineae) |
| Origin | Mexico/Central America (Mesoamerican centre — Vavilov) |
| Chromosome number | 2n = 20 |
| Type | Kharif (also Rabi/Spring); C4 plant; cross-pollinated (monoecious — male tassel at top, female ear on side) |
| India's rank | 5th largest producer globally |
| Top states | Karnataka, MP, Bihar, Rajasthan, Maharashtra |
NOTE
Maize is the only monoecious cereal — it has separate male (tassel) and female (ear/cob) flowers on the same plant. The male tassel at the top sheds pollen that falls onto the silks (stigma) of the ear below. This natural separation of sexes facilitates cross-pollination and hybrid seed production.
Climate and Soil:
- Temperature: 21-30 °C; frost-sensitive and requires warm weather throughout the growing period.
- Rainfall: 60-100 cm; maize cannot tolerate waterlogging, which causes root death and poor aeration.
- Soil: Well-drained sandy loam to loam with pH 5.5-7.5. Maize has a wide soil adaptability.
Varieties:
- Composites: Vijay, Sona, Jawahar — these are open-pollinated varieties that farmers can save seed from.
- Hybrids: Ganga-5, DHM-117, HQPM-1, Vivek QPM-9 — these give higher yields but seeds must be purchased each season.
- Baby corn and Sweet corn varieties are also commercially important for the vegetable market.
Cultivation:
| Practice | Details |
|---|---|
| Seed rate | 20-25 kg/ha (hybrids); 15-18 kg/ha (baby corn) |
| Spacing | 60-75 x 20-25 cm |
| Sowing time | Kharif: June-July; Rabi: October-November; Spring: February |
| Fertilizer (NPK) | 120-60-40 kg/ha; N in 3 splits; responds well to Zinc (ZnSO₄ 25 kg/ha) |
| Irrigation | 6-8 irrigations; critical at tasseling-silking |
| Critical stages | Tasseling, Silking, Grain filling |
| Duration | 80-110 days |
| Yield | 50-80 q/ha (hybrid, irrigated) |
Special Points:
- Fall Armyworm (Spodoptera frugiperda) — an invasive pest that entered India in 2018 from the Americas. It is a voracious feeder on maize and has become a major threat to maize cultivation across the country.
- QPM (Quality Protein Maize) — Specially bred maize varieties with enhanced lysine and tryptophan content (two essential amino acids normally deficient in regular maize). QPM addresses malnutrition, especially in populations that depend heavily on maize.
- Maize is the primary raw material for starch, ethanol, animal feed, and poultry feed in India's agro-industrial sector.
4. Sorghum (Sorghum bicolor)
Sorghum, known as Jowar in Hindi, is a remarkable cereal that thrives in hot, dry conditions where other crops fail. It is called the "Camel among crops" because of its extraordinary drought tolerance, made possible by its C4 photosynthetic pathway and deep, extensive root system.
| Parameter | Details |
|---|---|
| Family | Poaceae |
| Origin | Africa (Abyssinian centre — Vavilov) |
| Chromosome number | 2n = 20 |
| Type | Kharif + Rabi; C4 plant; cross-pollinated (often) |
| Common names | Jowar |
| Top states | Maharashtra, Karnataka, Rajasthan, MP, Tamil Nadu |
Climate and Soil:
- Temperature: 25-35 °C; highly drought-tolerant — sorghum can survive prolonged dry spells that would kill rice or wheat.
- Rainfall: 40-60 cm (grows well in low rainfall areas, making it a lifeline for dryland farmers).
- Soil: Medium to deep black soils (Regur); pH 6.0-8.5. Sorghum is remarkably adaptable across soil types.
Cultivation:
| Practice | Details |
|---|---|
| Seed rate | 8-10 kg/ha |
| Spacing | 45 x 15 cm |
| Fertilizer (NPK) | 80-40-40 kg/ha |
| Duration | 100-120 days |
| Yield | 25-40 q/ha |
Varieties: CSH-16, CSH-23, SPV-462, M-35-1 (Rabi), Parbhani Moti
Special Points:
WARNING
Young sorghum plants contain HCN (Hydrocyanic acid/Dhurrin) which is toxic to livestock. Grazing animals on young sorghum plants can cause cyanide poisoning. The HCN content decreases as the plant matures, so sorghum should only be fed to animals after flowering or after proper drying.
- Sweet sorghum varieties are cultivated specifically for bioethanol and syrup production from their juice-rich stems — an emerging biofuel crop.
- Sorghum is a major Rabi crop in Maharashtra (especially the Marathwada and Solapur regions), where it is grown on residual soil moisture after the monsoon.
5. Pearl Millet (Pennisetum glaucum)
Pearl millet, called Bajra in Hindi, is the most drought and heat tolerant among all cereals. It is aptly called the "Poor man's cereal" because it grows successfully in the harshest, driest environments where no other cereal can survive — hot sandy deserts of Rajasthan, for example.
| Parameter | Details |
|---|---|
| Family | Poaceae |
| Origin | Africa (Tropical West Africa) |
| Chromosome number | 2n = 14 |
| Type | Kharif; C4 plant; cross-pollinated (protogynous) |
| Common names | Bajra |
| Top states | Rajasthan (largest), Gujarat, Haryana, UP, Maharashtra |
Climate and Soil:
- Temperature: 25-35 °C; the most drought and heat tolerant cereal, capable of withstanding extreme aridity.
- Rainfall: 25-50 cm (the lowest water requirement among all cereals — this is why it dominates in Rajasthan's arid zones).
- Soil: Sandy to sandy loam; tolerates poor, infertile soils with pH 6.0-7.5.
Cultivation:
| Practice | Details |
|---|---|
| Seed rate | 4-5 kg/ha (lowest among major cereals) |
| Spacing | 45 x 10-15 cm |
| Fertilizer (NPK) | 60-30-30 kg/ha |
| Duration | 70-90 days (shortest among major cereals) |
| Yield | 20-30 q/ha |
Varieties/Hybrids: HHB-67 (most popular), ICTP-8203, Pusa-322, Pusa Composite-443
Special Points:
- Protogyny — In pearl millet, the stigma matures 2-3 days before the anthers on the same spike. This means the female parts are receptive before the male parts release pollen, which naturally facilitates cross-pollination from neighbouring plants. This is a key distinguishing reproductive feature of pearl millet.
- Pearl millet is naturally rich in iron and zinc. Biofortified varieties like Dhanashakti have been developed with even higher mineral content to combat malnutrition.
- 2023 was declared the International Year of Millets by the United Nations, at India's initiative, to promote awareness about the nutritional and environmental benefits of millets worldwide.
Comparison of Major Cereals
| Parameter | Rice | Wheat | Maize | Sorghum | Pearl Millet |
|---|---|---|---|---|---|
| Season | Kharif | Rabi | Kharif/Rabi | Kharif/Rabi | Kharif |
| Photosynthesis | C3 | C3 | C4 | C4 | C4 |
| Pollination | Self | Self | Cross | Often cross | Cross |
| 2n | 24 | 42 | 20 | 20 | 14 |
| Seed rate (kg/ha) | 20-25 | 100-125 | 20-25 | 8-10 | 4-5 |
| Water need | Very High | Medium | Medium | Low | Very Low |
| Top state | West Bengal | UP | Karnataka | Maharashtra | Rajasthan |
TIP
Memory aid for photosynthesis type: Rice and Wheat are C3 (the two most water-demanding cereals). Maize, Sorghum, and Pearl Millet are C4 (all three are more drought-tolerant and water-efficient). C4 plants have higher photosynthetic efficiency in hot, dry conditions.
Key Points for CUET
Quick Revision — Must-Remember Facts
- IR-8 — "Miracle Rice"; first HYV released in India (1966)
- Wheat is hexaploid (2n = 42, AABBDD genome)
- Maize is the only monoecious cereal (separate male and female flowers on same plant)
- Pearl millet shows protogyny (stigma matures before pollen)
- Sorghum contains HCN (Dhurrin) — toxic to livestock in young stage
- 2023 = International Year of Millets (UN, India's initiative)
- CRI stage in wheat and Tasseling-Silking in maize are the most critical stages for irrigation
- SRI method in rice saves 30-50% water using young seedlings and AWD irrigation
- Pearl millet has the shortest duration (70-90 days) and lowest seed rate (4-5 kg/ha) among major cereals
- Maize is called "Queen of Cereals"; Sorghum is the "Camel among crops"; Pearl millet is the "Poor man's cereal"
Summary Cheat Sheet
| Concept / Topic | Key Details / Explanation |
|---|---|
| Cereals — Family | Poaceae (Gramineae); cultivated for starchy edible grains |
| Rice | Oryza sativa; 2n = 24; C3; self-pollinated; Kharif |
| Rice — India rank | 2nd producer (after China); 1st in area |
| Rice — Climate | 25-30°C optimum; rainfall 100-200 cm; clayey loam, pH 5.5-6.5 |
| Rice — IR-8 | First HYV in India (1966); "Miracle Rice"; from IRRI |
| Rice — Seed rate | Transplanting: 20-25 kg/ha; Direct: 60-80 kg/ha |
| Rice — Fertilizer | 120-60-40 NPK; N in 3 splits |
| Rice — Water / Yield | 1200-1400 mm; 40-60 q/ha |
| SRI | Young seedlings (8-12 d), single/hill, AWD; saves 30-50% water |
| Wheat | Triticum aestivum; 2n = 42 (hexaploid AABBDD); C3; Rabi |
| Wheat — India rank | 2nd producer (after China) |
| Wheat — Sowing | Timely: Nov 1-15; late loses 25-30 kg/ha per day |
| Wheat — Seed rate | 100-125 kg/ha (normal) |
| Wheat — CRI | Most critical irrigation at 21 DAS; 30-40% yield loss if missed |
| Wheat — Yield | 40-55 q/ha |
| Maize | Zea mays; 2n = 20; C4; cross-pollinated; monoecious (only one among cereals) |
| Maize — Nickname | "Queen of Cereals" |
| Maize — Critical stage | Tasseling-Silking |
| Maize — Fall Armyworm | Spodoptera frugiperda; entered India 2018 |
| QPM | Quality Protein Maize — enhanced lysine + tryptophan |
| Sorghum | Sorghum bicolor; 2n = 20; C4; "Camel among crops" |
| Sorghum — Climate | Drought-tolerant; rainfall 40-60 cm; black soils |
| Sorghum — HCN | Young plants contain HCN/Dhurrin — toxic to livestock |
| Pearl Millet | Pennisetum glaucum; 2n = 14; C4; protogynous; "Poor man's cereal" |
| Pearl Millet — Top state | Rajasthan; rainfall 25-50 cm (lowest need) |
| Pearl Millet — Seed rate | 4-5 kg/ha (lowest); duration 70-90 days (shortest) |
| C3 cereals | Rice, Wheat |
| C4 cereals | Maize, Sorghum, Pearl Millet |
| International Year of Millets | 2023 (UN, India's initiative) |
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