Quantity of seed required for sowing direct-seeded rice in a 10,000 square metre area at a spacing of 20 cm × 5 cm. if 1000 grain weight is 20 g and germination and purity is 90% each.
Seed rate (kg/ha) = (test weight, (w)×100) / (Spacing (R×P)) × (100) / (Germination %) × (100) / (Purity %) = (20×100) / (20×5) × (100 / 90) × (100 / 90) = 24.69 kg=24.7 kg
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