Revenue recognition standard covers sales part. Are you following IndAS or AS?
AS 10 covers this as long as it is a bearer plant only. Then, Revenue recognition standard will deal with sales. (This is my assumption here)
IndAS 41 covers this as long as it is not a bearer plant. Since tamarind is a bearer plant, PPE standard prescribes the treatment, Sales is revenue recognition standard again.
Inventory & taxes standard is involved as well.
https://www2.deloitte.com/content/dam/Deloitte/in/Documents/CIP/in-ind-as-bearer-plants-noexp.pdf
Anything what you sell for consideration in the ordinary course of business is called as Income, so yes, it can be presented as agricultural income.