Pearl Millet (Bajra) Cultivation: Important Facts & One-Liners 🌾
📌 1. General Introduction & Botany
- Botanical Name: The most common and important botanical name is Pennisetum typhoides. Other names include Pennisetum glaucum and Pennisetum americanum.
- Family: Poaceae (also known as Gramineae).
- Chromosome Number: 2n = 14 (similar to barley).
- Inflorescence & Fruit: The inflorescence of bajra is known as a spikelet, and its fruit type is a caryopsis.
- Pollination: Bajra is a cross-pollinated crop. This happens due to Protogyny, a condition where the female flower matures before the male flower.
🌾 2. Nutritional Value
- Protein & Minerals: Bajra contains about 11.6% protein and is uniquely rich in minerals (up to 2.7%), making it nutritionally superior to many other cereal crops.
- Phosphorus Content: While the grain is rich in phosphorus, it is highly important to note from an exam perspective that about 80% of this phosphorus is present in the form of phytate or phytic acid.
🌱 3. Important Varieties & Hybrids
- First Hybrid: HB-1 is the very first hybrid of bajra, developed in the year 1965.
- Popular Varieties: Pusa Moti and PHB 10.
- Pusa Giant (Special Note): Pusa Giant is not just a standard variety; it is actually a cross between Napier grass and Bajra.
🌦️ 4. Climate and Soil Requirements
- Soil: The best soil for bajra is light sandy loam or light loamy soil. Cultivation in heavy black soil should be avoided, and the field must be well-drained.
- pH & Tolerance: It thrives in a pH range of 6.5 to 8 and can easily tolerate alkaline conditions and soil salinity. However, it does not tolerate acidic soils. It is heavily known for growing well even in poor, low-fertility soils.
- Climate & Season: Bajra is primarily a Kharif season crop requiring a hot, tropical climate.
- Temperature: The optimum temperature for its growth is between 20°C and 28°C, though it can easily withstand extreme temperatures up to 40°C to 45°C.
💧 5. Water Management
- Lowest Water Requirement: Among all crops, bajra has the lowest water requirement, needing only 25 to 50 cm of water for its complete lifecycle. (For context, paddy requires the highest amount of water).
- Sensitivities: Despite its drought tolerance, bajra is highly sensitive to waterlogging.
- Irrigation Stages: While mainly a rainfed crop, if cultivated during the summer (Zaid) season, irrigation should be provided during two critical stages: the Tillering stage and the Flowering stage.
📏 6. Agronomy: Seed Rate, Spacing & Sowing
- Seedbed Preparation: Because bajra seeds are very small, a fine seedbed is strictly required.
- Time of Sowing:
- Kharif: June-July (on the onset of monsoon).
- Summer (Zaid): February-March (under irrigated conditions).
- Seed Rate: 4 to 5 kg per hectare.
- Sowing Depth: The seeds should be sown very shallow, at a depth of just 2 to 3 cm due to their tiny size.
- Spacing: 45 cm x 15 cm (Row-to-Row: 45 cm, Plant-to-Plant: 15 cm).
- The Importance of Thinning: Since small seeds are often broadcasted, multiple plants can sprout tightly together. To maintain an optimum plant population of 1.5 lakh plants per hectare, complete plant removal (called Thinning) is highly essential.
🌿 7. Fertilizers
- Rainfed Conditions: NPK requirement is 40 : 20 : 0 kg/ha.
- Irrigated Conditions: NPK requirement is increased to 60 : 30 : 0 kg/ha.
🦠 8. Major Diseases
Make sure to memorize the scientific names of these crucial pathogens:
- Downy Mildew / Green Ear Disease: This is the most famous disease in bajra, caused by Sclerospora graminicola. Exam questions frequently use the name "Green Ear Disease" instead of Downy Mildew.
- Ergot Disease: Caused by Claviceps fusiformis.
- Rust: Caused by Puccinia substriata.
