Investors have been harvesting big gains in the past month from agricultural commodities, and some of the futures, such as sugar and soybeans, were near levels this week not seen in 18 months or more.
Latin America weather woes and the Brazilian government turmoil are playing a major role in the month-long ag rally. Brazil's real has strengthened against the dollar, encouraging producers of traditional export products, such as coffee and sugar, to sell supplies at home.
"You had the real, which started to appreciate in anticipation of the impeachment of President (Dilma) Rousseff," said David Maloni, chief commodity strategist at the American Restaurant Association. "You also have a lot of investment money coming in on the long side as opposed to the short side, which is bringing support to the markets."