Rice is the staple food of the people of Sri lanka. It is a crop of very wide physiological adaptability, which suits well under Sri Lankan condition. Rice grows well on clayey loams to clays . It can also be cultivated on damp alluvial soils, light sands  both high and low lands. The crop thrive best under conditions of high temperature and humidity that suits well under Sri Lankan condition. Being a semi-aquatic plant, the main limiting factor is an adequate supply of water. The Sri Lanka is having tropical and sub-tropical conditions where rice can be grown practically throughout the year. Traditionally double cropping of rice is possible there, a quick maturing varieties followed by a long duration type or vice versa. Tripple cropping of rice can also be followed in areas where assured irrigation facilities are available. Rice can also be rotated with chilli, tobacco, turmeric, sunhemp etc.

I think if you can choose suitable cultivar depends on the soil and weather condition traditional rice cultivation will be profitable in Sri Lanka.

thank you very much sir for your valuable idea. yes it is sir. but sir my investigation is target basically on farmers who are in paddy farming community. And are they getting sufficient income by doing traditional farming in sri lanka? what can effect on this.can you provide me some related researches that done in other countries if have with you some???

i think, you can use "jajar legowo" technique. The name of "jajar legowo" based from Javanese, Indonesia. So, you plant paddy 2:1. So, every 3 rows of paddy, you just plant 2 rows and 1 row remain you shouldn't plant. This technique will provide more sunlight, fertilizer, water, and space for plant. This is provide more income by increasing their yield. You can use 4:1 too. You can search it, but i think it will be difficult because may articles in Indonesian. I hope your research will success in the future, especially for Sri Lanka farmer

Please look at the mentioned site where they claim Rs, 75000 per acre net profit on rice cultivation in similar situation at Tamil Nadu India

www.agricultureinformation.com/.../57268-rs-75000-per-acre-net-profit-techno-feasi...