- Tobacco seeds are tiny and are initially grown in nurseries before transplanting.
- Seed Rate: 500-600 g/ha.
- Nursery Bed Preparation:
- Beds are made in well-drained soil and sterilized with formalin or through solarization to prevent fungal infections.
- Seeds are mixed with fine sand and spread evenly across the beds.
- Light and consistent watering is done to maintain moisture levels.
- Seedlings, 45-50 days old and 10-15 cm tall, are ready for transplanting.
Transplanting:
Explain the construction of a spherical wavefront by using Huygens' principle.
The slope of the tangent to the curve \( x = \sin\theta \) and \( y = \cos 2\theta \) at \( \theta = \frac{\pi}{6} \) is ___________.