How do I grow sweet basil (sabja, tukmaria) for seed and what climate does it need?

Sabja or tukmaria is the seed of sweet basil, different from tulsi which is holy basil. It is a warm season crop that likes warm weather and well drained soils, and it is grown in parts of Madhya Pradesh, Maharashtra, Gujarat, Rajasthan and the south. The seed is very small, so the seed rate per acre is low and shallow sowing with even spread is important, often mixing seed with sand. The crop flowers and sets seed in the heads which are harvested when mature and dried, then threshed gently. It needs moderate water, not waterlogging. Sabja has a defined food market through the cold drink, falooda and sherbet trade, but it is still a niche crop, so confirm a buyer and check the right variety and sowing window for your area with your KVK.