Subtopic: Functional requirements, principles of working, construction and operation of manual, animal, tractor and renewable energy operated equipment for tillage, sowing, planting, fertilizer application, inter-cultivation, spraying, mowing, chaff cutting, harvesting and threshing
Question Statement:
A 9-row fluted roller type seed drill with 400 mm ground wheel diameter is used for sowing wheat at 200 mm row spacing. Each fluted roller discharges 6500 mm³ volume of seeds per revolution. The ratio of ground wheel rpm to fluted roller shaft rpm is 2:1. If the bulk density of wheat is 850 kg m⁻³, the seed rate in kg ha⁻¹ will be __________.
Official Answer Key:
108.50 to 110.50
Step-by-Step Solution & Explanation
• Distance travelled per ground-wheel revolution = πD = π × 0.400 m = 1.2566 m.
• Ground wheel : roller = 2:1, so per ground-wheel revolution the roller turns 0.5 revolution.
• Seed discharged per row per ground-wheel revolution = 0.5 × 6500 = 3250 mm³. For 9 rows: 9 × 3250 = 29,250 mm³.
• Swath width = 9 rows × 0.200 m spacing = 1.8 m. Area covered per ground-wheel revolution = 1.2566 m × 1.8 m = 2.2619 m².
• Seed volume per unit area = 29,250 mm³ / 2.2619 m² = 12,932 mm³/m². Per hectare (10,000 m²): 129.32×10⁶ mm³/ha = 0.12932 m³/ha.
• Seed rate = volume × bulk density = 0.12932 m³/ha × 850 kg/m³ ≈ 109.9 kg/ha, inside the accepted range 108.5–110.5.
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