Notice for unclaimed cash deposit

hi ,

i have deposited Rs 1046000 cash in my bank account   A Y 2011-12 and received notice from income tax department for the same. i have visited income tax department and claim it is a agricultural income but assessing officer denying to accept and also he is telling that we will issue order.

what assesing offcer has right and how much tax i have to paid. 

pls suggest your best opinion.

Regards

Abhishek