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Wheat Cultivation: One-Liners & Important Facts 🌾

Welcome to our comprehensive revision notes on Wheat Cultivation. Whether you are studying for ICAR, UPSC, or State Agri Exams, these quick, high-yield facts cover everything you need to score top marks on this major cereal crop!

📌 1. General Introduction & Botany

• Botanical Name: Triticum aestivum (the most commonly cultivated hexaploid wheat). Another important species is Triticum durum (tetraploid wheat).
• Family: Poaceae (also known as Gramineae).
• Chromosome Number: 2n = 42 for hexaploid wheat (T. aestivum) and 2n = 28 for tetraploid wheat (T. durum).
• Origin: South West Asia.
• Crop Significance: It is the major Rabi season cereal crop and the primary staple food for North India.

🌾 2. Classification of Wheat

Wheat cultivation is broadly divided into three main categories based on usage and ploidy level:

1. Bread Wheat / Mexican Dwarf Wheat (Triticum aestivum): This hexaploid wheat covers the largest cultivation area in India and is primarily used for making chapati and bread.
2. Macaroni / Durum Wheat (Triticum durum): A highly nutritious tetraploid wheat used to make pasta, macaroni, and dalia (porridge). It has the second highest cultivation area in India.
3. Emmer Wheat (Triticum dicoccum): Primarily used for making suji/rawa, it has a very limited cultivation area, mostly restricted to South India.

🌦️ 3. Climate and Soil Requirements

• Season: Wheat is a Rabi crop, requiring a cool and dry climate during its vegetative growth, and a warm climate during maturity.
• Temperature Requirements by Stage:
  • Optimum & Germination: 20°C to 25°C.
  • Tillering: 16°C to 20°C (requires the lowest temperature among all stages).
  • Flowering: 20°C to 25°C.
  • Maturity: 25°C to 30°C.
• Rainfall: 50 to 75 cm is sufficient. Excess rainfall can lead to lodging and various diseases.
• Soil: Well-drained loamy to clay loamy soil is ideal, with Alluvial soil being the absolute best.
• pH & Sensitivities: The ideal pH is 6 to 7.5. Wheat is highly sensitive to soil salinity and waterlogging.

📏 4. Agronomy: Field Prep, Sowing, & Fertilizers

• Field Preparation: Requires 1 to 2 deep ploughings followed by 2 to 3 harrowings. A fine tilth is essential for good germination, and a well-leveled field drastically improves irrigation efficiency.
• Time of Sowing:
  • Timely Sowing: 1st to 15th November.
  • Late Sowing: Goes up to 15th December.
• Seed Rate:
  • Timely Sowing (Irrigated): 100 to 125 kg/hectare.
  • Late Sowing: 125 to 150 kg/hectare.
• Spacing: The standard row-to-row spacing is 22.5 cm (though 20 cm is often practiced on the field).
• Depth of Sowing: 4 to 5 cm.
• Fertilizer Requirement (NPK): The standard ratio is 120 : 60 : 40 kg/ha. The complete dose of Phosphorus and Potassium, along with half the Nitrogen, is applied as a basal dose during sowing, while the remaining Nitrogen is given at later stages (like the CRI stage).

💧 5. Water Management (The 6 Critical Stages)

Wheat requires about 6 irrigations. Memorize these 6 Critical Stages and their timings, as they are highly tested:

1. CRI Stage (Crown Root Initiation): Occurs at 20 to 25 Days After Sowing (DAS). This is the most important stage; if a farmer only has water for one irrigation, it must be given now!
2. Tillering Stage: 40 to 45 DAS.
3. Jointing (Stem Elongation) Stage: 60 to 65 DAS.
4. Flowering (Booting) Stage: 80 to 85 DAS.
5. Milking Stage: 100 to 105 DAS.
6. Dough (Duff) Stage: 115 to 120 DAS.

🌿 6. Weed Management

• Most Problematic Weed: Phalaris minor (commonly known as "Gehu ka Mama" or gulli-danda). It is heavily controlled using Isoproturon or Sulfosulfuron (especially where resistance to Isoproturon has developed). Pendimethalin is also used.
• Other Grassy Weeds: Avena fatua (wild oat).
• Broadleaf Weeds: Chenopodium album (Bathua), which is highly susceptible to 2,4-D herbicide.

🦠 7. Major Diseases & Pests

Compared to paddy, wheat faces very few insect pest issues (minor occurrences of termites, aphids, and armyworms). However, diseases are significant:

• Rusts (Causal organism: Puccinia):
  • Yellow / Stripe Rust: Puccinia striiformis.
  • Brown / Leaf Rust: Puccinia triticina (or Puccinia recondita).
  • Black / Stem Rust: Puccinia graminis.
• Loose Smut: A major fungal disease caused by Ustilago nuda or Ustilago tritici.
• Karnal Bunt: Specially found in India, caused by Neovossia indica (or Tilletia indica).

(Note: Today, mostly rust-resistant varieties are cultivated to combat rust diseases.)

🚜 8. Harvesting & Yield

• Signs of Maturity: Wheat is ready to harvest when the grains become hard and the straw turns completely yellow.
• Moisture Content at Harvest: 20% to 25%.
• Yield:
  • Irrigated conditions: 45 to 60 quintals per hectare.
  • Rainfed conditions: 25 to 35 quintals per hectare.

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