Step 1: Seed Rate Definition.
Seed rate is the quantity of seed necessary per unit area to achieve optimal plant density.
Factors influencing seed rate include sowing timing, method, and seed size.
Step 2: Timely vs. Delayed Sowing.
- For wheat sown in November (timely), the recommended seed rate is 100-125 kg/ha.
- For wheat sown from December onwards (late), the growing period is shorter, and low temperatures lead to reduced tillering.
- To compensate for diminished tillering in late-sown crops, a higher seed rate is required.
Step 3: Evaluation of Options.
- (A) 75-100 kg/ha: Insufficient, suitable only for irrigated wheat sown on time.
- (B) 100-105 kg/ha: Appropriate for normal sowing, not for late sowing.
- (C) 125-150 kg/ha: Slightly elevated but still inadequate for late sowing.
- (D) 150-180 kg/ha: Correct, as late-sown wheat necessitates increased seeding to establish an optimal plant stand.
Step 4: Determination.
Consequently, the recommended seed rate for late-sown wheat is 150-180 kg/ha.