Question

Mungbean seed required for the sowing one hectare land at 30cm x 10cm spacing with 92 per cent germination, 85 per cent purity and 36g weight of 1000 seed will be .

• A. 12.34 kg
• B. 15.34 kg
• C. 18.34 kg
• D. 20.34 kg

Hint:

First find plants per hectare from the spacing, convert to seed weight, then divide by germination times purity.

Answer 1

The Correct Option is B

Step 1: Use the direct seed rate formula: $\text{Seed rate (kg/ha)} = \dfrac{\text{Plant population} \times \text{1000-seed weight (g)}}{1000 \times \text{germination fraction} \times \text{purity fraction} \times 1000}$.

Step 2: Plant population comes from the area per plant: with 30cm and 10cm spacing, each plant occupies $0.03 \, m^2$, giving $\frac{10000}{0.03} = 333333.33$ plants/ha.

Step 3: Substitute the values: $\text{Seed rate} = \dfrac{333333.33 \times 36}{1000 \times 0.92 \times 0.85 \times 1000}$ kg. The numerator gives $12000000$ g-equivalent units, and dividing by $782000$ gives approximately $15.34$ kg/ha.

This confirms the sowing rate needed for the given field quality parameters.

\[\boxed{15.34 \, \text{kg/ha}}\]