Cultivation of sugar-free potatoes is bringing good health to the farmers in around 19 villages of Nagaon. Now, this is not because the consumption of the same minimizes their risk of becoming diabetic, but because of the buy-back process in the contact farming system, which is fetching them Rs 6 per kg at a time when the other local potato growers in the State are struggling for a market, where they can get only Rs 3 per kg at bulk selling.