1.   A lack of maturity in the fields has raised some concern that the eventual frost could reduce output.

2.   Since less than half the soybean crop is mature, an early frost could reduce yields, traders said.

3.   The approach of winter in Brazil is helping fuel the rally, since traders are growing concerned that frosts could reduce production.

4.   The approach of winter in Brazil is helping fuel the rally because traders are concerned that frost could reduce harvests.

5.   The approach of winter in Brazil is helping fuel the rally because traders are concerned that frosts could reduce harvests.

6.   Febec said the rise brings exports back to normal levels, after two frosts reduced the harvest in the previous crop year.