Quantity of seed required for sowing direct-seeded rice in a 10,000 square metre area at a spacing of \(20cm \times 5cm\) if 1000 grain weight is \(20g\) and germination and purity is \(90\%\) each.
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Seed rate = (Number of seeds \(\times\) 1000 grain weight) (Germination \(\times\) Purity \(\times\) 1000).
Always adjust for germination and purity.