India will be unable to consume or export enough wheat and rice to rein in a record stockpile after another bumper harvest, a failure that means crops risk rotting in fields instead of being sold on world markets to cash in on higher prices. In March, farmers in India will begin to harvest the sixth consecutive wheat crop expected to exceed demand, and when threshing is over in June the government’s combined wheat and rice stocks are set to hit 100 million tonnes. That is about a fifth higher than the volume in storage a year ago. The grain mountain is worth about $30 billion and the nation of 1.2 billion will soon have enough wheat piled up to feed its poor for a year.