A graduate from a village in Karnataka's Kalaburgi has developed a unique kind of watermelons that are yellow on the inside in his field.Basavaraj Patil, a graduate from Koralli village in the state has scientifically cultivated yellow watermelons and has also teamed up with the local mart and Big bazar in the city to sell the produce and has been earning profits from them as well.Patil said that he has earned profits of over Rs 1 lakh by selling these watermelons so far.Speaking to news agency ANI, Patil said, These taste sweeter than red watermelons. I invested Rs 2 lakhs & have earned profit of over Rs 3 lakhs. We should diversify our crop production in India."The more common, reddish-pink variety of watermelon is a clear favourite during the summers, but off late, this new kind of fruit has been catching up to fruit lovers as well. These fruits have a similar green rind but are yellow fleshed inside.Classified as Citrullus lanatus, the yellow watermelons occur naturally and are considered one of the oldest varieties and can be traced back to Africa and were being cultivated before the widespread cultivation of the red kinds. These melons are also a good source of vitamins A and C, antioxidants that can help reduce inflammation and toughen the immune system.The yellow ranges from pale colour to slight golden and the flesh is succulent and dense, and often contains edible, brown-black seeds or can be totally seedless as well. The melons have a delicate, mellow and sweet flavour.These watermelons have also been cultivated in parts of Tamil Nadu earlier. Also in Goa, a young farmer had also cultivated these type of watermelons without using any chemical fertilisers or pesticides.Nitesh Borkar had spent just Rs 4,000 and earned more than Rs 30,000 at the sale.