Arhar Cultivation: Sowing, Spacing, Crop Care and IPM

Soil Suitability, Climate and Land Preparation

Arhar thrives in warm, subtropical climates with moderate rainfall (600 to 800 mm). It requires deep, well-drained sandy loam to clay loam soils with a neutral pH ranging from 6.5 to 7.5. The crop is sensitive to waterlogging and saline-alkaline soil conditions.

Prepare the field with one deep summer ploughing to break hard subsoil pans, followed by two cross-harrowings and leveling. Constructing broad bed and furrow (BBF) or ridge-and-furrow layouts improves soil aeration and prevents root asphyxiation during heavy monsoon showers.

• Optimal Soil pH: Grows best in well-drained loamy soils with pH between 6.5 and 7.5.
• Drainage Necessity: Sensitive to stagnant water; ridge-and-furrow sowing prevents collar rot and root rot.
• Deep Taproot: Penetrates up to 2 meters deep, breaking subsoil pans and extracting residual subsoil moisture.
• Nitrogen Fixation: Fixes up to 40 kg of atmospheric nitrogen per hectare through root nodule symbiosis.

Sowing Window, Seed Treatment and Field Spacing

The optimal sowing window for kharif arhar is June to early July with the onset of the monsoon. Sowing certified seeds of short-duration (120 to 140 days) or medium-duration (160 to 180 days) varieties ensures timely harvest ahead of rabi crop planting.

Before sowing, treat seeds with Trichoderma viride to prevent Fusarium wilt, followed by bio-fertilizer inoculation with crop-specific Rhizobium and Phosphate Solubilizing Bacteria (PSB). Sowing spacing varies from 60 x 15 cm for short-duration types to 90 x 20 cm for spreading, medium-duration cultivars.

• Sowing Window: Late June to mid-July with early monsoon rains.
• Seed Treatment: Treat with Trichoderma and Rhizobium culture to enhance nodulation and wilt protection.
• Intercropping Models: Compatible with soybean (1:2 ratio) or cotton (1:1 ratio) to maximize land productivity.
• Sowing Depth: Place seeds 4 to 5 cm deep in moist soil for uniform germination within 5 to 7 days.

Integrated Pest Management, Flowering Care and Harvest

The most critical threat to arhar yields is the gram pod borer (Helicoverpa armigera) and pod fly (Melanagromyza obtusa), which attack during flowering and pod development stages. Install pheromone traps at 4 to 5 per acre to monitor adult moth activity.

Apply recommended biological or approved chemical sprays at early flowering and pod initiation to control young caterpillars. Harvest the crop when 80 to 85 percent of pods turn brown and dry, thresh using mechanical pulse threshers, and dry grains to 10-12 percent moisture for safe storage.

• Pod Borer Management: Install pheromone traps and spray approved CIBRC bio-pesticides or chemistries at flowering.
• Fusarium Wilt Prevention: Use certified wilt-resistant varieties and maintain 3-year crop rotations.
• Critical Irrigations: If dry spells occur, provide protective irrigations at flower initiation and pod filling.
• Harvesting Routine: Harvest when pods turn golden brown; sun-dry harvested stalks before threshing.

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Common questions

General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.