Neelamraju Ganga Prasada Rao, who recently passed away, was the well-known scientist of which field?

Dr. Neelamraju Ganga Prasada Rao (89), the noted agricultural scientist, has recently passed away in Hyderabad,Telangana. He is famously known as “Father of Hybrid Sorghum” and also famous for his basic and applied research in breeding and agronomy of several dry-land crops.