From his sleepy village in Bihar, Ram Narain arrives at Gulab Bagh market to sell a truckload of corn that will fetch him enough money to buy a motorbike for his son, school uniforms for his daughter and a gift for his wife. Narain and legions of farmers in the state have more than doubled corn output in just five years by adopting hybrid seeds and good farm practices, a rare success story Prime Minister Narendra Modi wants to replicate in other states. He came to power six months ago by promising faster farm and economic growth. Traders such as Cargill Inc, Glencore ...