What yield and price range can I realistically expect from Kalmegh?

Honestly, Kalmegh yield and price both vary a lot by year, quality and buyer, so plan with conservative ranges and verify locally. Dry herb yield per acre falls in a modest range depending on management and variety. Price per kg of dry herb is buyer and quality driven, often tied to the active compound content, and can swing widely between seasons, so do not lock your budget on any single high number a promoter quotes. Build your plan on the low end so you are not caught out. Because it is a short single season crop with low input cost, the downside is limited even if prices are weak, but you still need a confirmed buyer. Get a written price and confirm demand before sowing, and treat all figures as unverified ranges until you sell.