1.Does farming and selling of leucaena leucocephala trees and Eucalyptustrees is Agriculture income

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.