Have you thought about adding orange farming to the mix? The soil is so much more valuable (per acre) than for rice. IMO.
Is orange farming profitable in India? Farmers make a profit of Rs3-5 lakh per acre when the crop and the rate are good. Oranges thrive well in sub-tropical climate. In India, orange farmers take two crops a year. Some take a winter crop and others in summer.
You should be able to do the math, and compare with the yield of rice...
Can orange be grown in India? Important mandarin orange varieties cultivated in India are Ngapur Santra, Coorg Santra, Khasi Santra, Mudkhed, Shringar, Butwal, Dancy, Kara (Abohar), SZ-IN-COM, Darjeeling Mandarin, Sumithra mandarin, Seedless-182 and Kinnow mandarin.