Explanation:

The sunflower (Helianthus) is a tall annual that can grow to a height of 400cm, depending on the variety. It bears wide, terminal capitula (flower heads), circled by bright yellow ray florets. Sunflower is sown by Dibbling method which requires 5-6 kg seed per hectare, while furrow sowing needs 8-10 kg per hectare. The excess seedlings are thinned 10-15 days after seedling emergence. Seeds should be treated with captan or ceresan @ 3 g/kg seed under dry land conditions.