I agree with Mr Rambhia.
Agricultural income includes Income by the performance of any process to render the produce fit to be marketed.
So, sugar cane sold in the raw form is agricultural income; while the products brought out from it by way of jaggery or sugar/candy would be business income.
When there was no market for the sugarcane produced by the assessee in its natural condition, income received by the assessee from sale of jaggery was exempt from tax as agricultural income. CIT v H.G. Date [1971] 82 ITR 71 (Bom.).
If the sugarcane is ordinarily saleable in the market without any other subsequent process, the process of converting it into jaggery or sugar will not be a process to render the produce fit to be taken to the market.