oil palm.
you can get 8 ton /acre/year after 6-7 years
now price 4000 / ton in tamilnadu = 4000x8=32000
expenditure 2 ton / acre
net 6 ton *4000=24000 you can get per acre.
positve : every 10 days onec you get income.
negative: 1)more water
2)harvest and transport
3)not very good income...